GroupDIY

Project Specific Discussions => Dynamic Processors => Topic started by: dirty1_1garry on May 12, 2016, 04:16:38 AM

Title: DB54 - Creating of 2254 style compressor {update 12.10.18}
Post by: dirty1_1garry on May 12, 2016, 04:16:38 AM
Now 2254 fully calibrated and works as it should!

Here is an updated front panel:
(http://groupdiy.com/gallery/0/47634-051016043809.jpeg)

Will be available two kits for those who are interesting in building their own compressor:
- first kit will contain BA185, BA191, BA283 boards, board for joining BA cards, face board for switches and 24V psu board. This kit will be available for shipping by end of october.
- second kit will contain first kit plus face panel and 1U enclosure. This kit will be available for shipping by end of november.
Of course kits will be supplied with a full information for happy build, including step-by-step instructions :P

Who are interested -  contact me with personal message or with e-mail [email protected] (as GDIY personal message can overflow quickly)
I think that in nearly days I will open whitemarket thread for more open information about how to purchase kits.


Some additional info here:
http://wiki.diyrecordingequipment.com/projects/garash-db54-diode-bridge-compressor/
Looks like first diy diode bridge compressor project? :P

Build info here:
http://bit.ly/2dLli43
Now it contain partlist, bom, samples, assembly manual (mouser cart link, transformer list) front panel holes dimensions.

Progress:
12.06.16 - topic start
21.09.16 - first run, check Reply #41 for video!
05.10.16 - fully calibrated and works as it should, check Reply #48 for more info.
10.11.16 - samples added! Check reply#71 and #73
25.03.17 - assemble gude added. Check reply#126 and further
12.10.18 - 9 kits left from third batch




----------------------------------------------------
PRIMORDIAL THREAD:

As a couple years ago I was really inspired by original 2254,  I've started to explore its schematic and construction. Now, after about 8 month of lazy processing I've got some results that I hope very soon will be materialises in to the real piece of gear!

During my explore I’ve decided to get best from vintage, save mojo approach as possible, extract some not useful function and add some additional options multiplied by modern approach.

And here is what I’ve got:
- first of all I’ve recreated original BA cards - 185, 191 and 283, I hope that save some vintage “mojo”. Using same 18pin connectors give possibilities of using vintage cards that sometimes can be found on evilbay.
- one mono unit will feat into 1U
- limiter function was deleated, compressor only
- all wires between BA cards was replaced with pcb
- additional variable attack times (original has fixed on 5mS)
- additional faster release times
- meter off switch. Yeah, that's my own freaking function. It stay compressor in action but turn off the gain reduction meter. It let me concentrate on the sound and hearing it with ears not eyes))
- relay bypass

Unit will need three transformers (31267, 10468, 1166), three BA cards - 185, 191 and 283 and outboard power supply.


(http://groupdiy.com/gallery/0/47634-120516042148.png)
(http://groupdiy.com/gallery/0/47634-120516042215.jpeg)
Title: Re: Creating of 2254 style compressor
Post by: thomasdf on May 13, 2016, 03:15:31 PM
Bravo!!
Title: Re: Creating of 2254 style compressor
Post by: iprovlek on May 13, 2016, 03:19:51 PM
Great man!!!

This will be PROJECT!!!! 8)
Title: Re: Creating of 2254 style compressor
Post by: dirty1_1garry on May 13, 2016, 07:13:42 PM
Great man!!!

This will be PROJECT!!!! 8)

Will do everything possible to make it a nice PROJECT!)
Title: Re: Creating of 2254 style compressor
Post by: dirty1_1garry on May 24, 2016, 08:53:17 AM
a little bit of progress here!
Title: Re: Creating of 2254 style compressor
Post by: Rocinante on May 24, 2016, 10:24:14 AM
Yes, yes bravo!!
Title: Re: Creating of 2254 style compressor
Post by: evilcat on May 24, 2016, 01:45:17 PM
Awesome man! I'll keep an eye on this one!!!
Title: Re: Creating of 2254 style compressor
Post by: Spencerleehorton on May 25, 2016, 04:43:43 AM
Rubbing my hands together for a 2U stereo version of this!!!!

;)
Title: Re: Creating of 2254 style compressor
Post by: dirty1_1garry on May 25, 2016, 04:53:28 AM
Rubbing my hands together for a 2U stereo version of this!!!!

;)

Why not.
Title: Re: Creating of 2254 style compressor
Post by: Spencerleehorton on May 25, 2016, 06:28:11 AM
You going to use lorlins?
And when are the pcbs available you hope?
Also am I right in thinking the limiter function  can be added?

Regards

Spence.
Title: Re: Creating of 2254 style compressor
Post by: dirty1_1garry on May 25, 2016, 07:36:55 AM
You going to use lorlins?
And when are the pcbs available you hope?
Also am I right in thinking the limiter function  can be added?

Regards

Spence.

- Yes, I'm going to use lorlins rotaries for attack, release and ratio. They are good enough for that purposes. For threshold and gain make up there will be potentiometers.
- pcbs will be available after that moment when I will test prototype. All components are on order, so when they will arrive I will move forward
- Are you sure that it's useful?) I asked a couple folks who use 2254 a lot, all folks sad that they never use limit mode so I decide to remove it. But in future that's possible to add it (it will add one more BA cards and one more transformer)
Title: Re: Creating of 2254 style compressor
Post by: Spencerleehorton on May 25, 2016, 11:38:03 AM
yeah,
just like some of the neve stuff ive built you can omit what you dont want.
Im happy to build and test one if you have any other pcbs going and i dont mind paying, msg me if you wanted, as i can build the transformers as well, i can print out the 283 pcb as i already have that the 185 and 191 i dont think i have but could mock them up easy enough, would just need the front panel pcb and other.

regards

Spence.
Title: Re: Creating of 2254 style compressor
Post by: dirty1_1garry on May 26, 2016, 02:01:59 PM
yeah,
just like some of the neve stuff ive built you can omit what you dont want.
Im happy to build and test one if you have any other pcbs going and i dont mind paying, msg me if you wanted, as i can build the transformers as well, i can print out the 283 pcb as i already have that the 185 and 191 i dont think i have but could mock them up easy enough, would just need the front panel pcb and other.

"as i can build the transformers" - tell us more!)
I should test and after that moment I can supply you with pcbs, that's no problem:)
Title: Re: Creating of 2254 style compressor
Post by: dirty1_1garry on May 26, 2016, 02:05:35 PM
this is how it will work
Title: Re: Creating of 2254 style compressor
Post by: Rocinante on May 26, 2016, 04:46:02 PM
That looks slick. I too am anxious to see how this turns out and would also like to hear more about Spencer winding his own xfmrs...
How do they compare to say.... carnhill or mariner?
Title: Re: Creating of 2254 style compressor
Post by: Spencerleehorton on May 26, 2016, 05:06:49 PM
Hi,

I've wound the 1166 and have a couple which work very well, I've put them in a stereo 1073 and I've wound two input txf which can be either 31267 or 10468.

Regards

Spence.
Title: Re: Creating of 2254 style compressor
Post by: dirty1_1garry on May 27, 2016, 06:57:48 AM
I had a little bit of experience in comparing Neve'sh transformers. I've compared input and output Marinair, Carnhill, Cinemag, EA, Sowter between each others. And that would be cool to hear Spencer ones!)
Title: Re: Creating of 2254 style compressor
Post by: Winetree on May 27, 2016, 01:51:36 PM
I've got a pair of your D.I.s. Great job on those.
This might be a little early, but I'd be interested in a pair of 2254s
Title: Re: Creating of 2254 style compressor
Post by: nielsk on May 27, 2016, 07:06:13 PM
Looks like an innovative assembly approach to what Chandler used to do (2254 with limiter deleted built from BA cards)
I have hand drawn notes on the Chandler interconnect of the BA cards and switches if needed...
Title: Re: Creating of 2254 style compressor
Post by: dirty1_1garry on May 28, 2016, 07:20:18 AM
Looks like an innovative assembly approach to what Ch*ndler used to do (2254 with limiter deleted built from BA cards)
I have hand drawn notes on the Chandler interconnect of the BA cards and switches if needed...

I have same drawing too :P when I had an experience to repair one. But I did not try to blindly clone it, I've just used that information as a part to build my version of 2254 :)
Title: Re: Creating of 2254 style compressor
Post by: Spencerleehorton on May 30, 2016, 05:15:33 PM
Hi.

Have wound a 10468 and going to test in the morning, have tested and getting 8H on the secondarys and 2H on primarys. DCR is 18ohms and 140ohms.
will rig it up so has series/parallel switch on Primary, will then wind a 31267 test.

regards

spence.
Title: Re: Creating of 2254 style compressor
Post by: Spencerleehorton on May 31, 2016, 01:37:26 AM
If they turn out good I'm happy to send you one maybe in exchange of some pcbs?
Title: Re: Creating of 2254 style compressor
Post by: dirty1_1garry on June 05, 2016, 02:29:38 PM
If they turn out good I'm happy to send you one maybe in exchange of some pcbs?

yeah, why not:)
Title: Re: Creating of 2254 style compressor
Post by: Spencerleehorton on June 05, 2016, 03:42:50 PM
Hi,

The results are pretty good but I want to do more testing with some different sizes as the inductance does seem to be off. I'm only getting 9H and need 35H on secondaries. Dropping down in size with the wire diameter will get me much closer and also I'm going to experiment with other cores.
Once I get this right and I'm happy that the sound benefits I'll send you a couple through.
Let me have an address that I can send them too.
You got any further with the 2254?

Regards

Spence.
Title: Re: Creating of 2254 style compressor
Post by: dirty1_1garry on June 15, 2016, 08:56:19 AM
a little bit of progress
Title: Re: Creating of 2254 style compressor
Post by: r2d2 on June 20, 2016, 09:30:08 AM

So nice .....

no limiter-peak stop as original ?

r.
Title: Re: Creating of 2254 style compressor
Post by: Vac11 on June 28, 2016, 07:50:05 AM
Any news? Great project ;)
Title: Re: Creating of 2254 style compressor
Post by: dirty1_1garry on July 09, 2016, 07:41:09 PM

So nice .....

no limiter-peak stop as original ?

r.

I decide create compressor only at this moment. I think main mojo of 2254 is the way how it compress, limiter is a second function.
And limiter need one more BA card and one more transformer, so it will be much harder to make it in 1U enclosure. Comp+limter will be the next step.
Title: Re: Creating of 2254 style compressor
Post by: dirty1_1garry on July 09, 2016, 07:51:05 PM
A little bit of progress here:
as I got some rare parts I've assembled all boards. All that is necessary right now is to assemble a small proto circuit for matching diodes on BA185 card, fit everything inside enclosure and join boards with transformers. Move forward :)
Title: Re: Creating of 2254 style compressor
Post by: dirty1_1garry on July 11, 2016, 09:25:00 AM
main parts = assembled! Searching for enclosure and psu board.
Title: Re: Creating of 2254 style compressor
Post by: Spencerleehorton on July 11, 2016, 10:33:49 AM
very nice indeed, get that psu sorted and lets hear some testing!!!! ;)

Spence.
Title: Re: Creating of 2254 style compressor
Post by: dirty1_1garry on July 14, 2016, 05:16:01 PM
First power on. No explosions and smoke  :P Already fixed a couple bugs on main pcbs.

Searching a cockroaches that don't allow a sound to pass through.
Title: Re: Creating of 2254 style compressor
Post by: innercityman on July 15, 2016, 03:17:57 AM
Very interesting project ! Could you already give a price for a finished unit ?
Title: Re: Creating of 2254 style compressor
Post by: Indecline on July 17, 2016, 11:15:56 AM
First power on. No explosions and smoke  :P Already fixed a couple bugs on main pcbs.

Searching a cockroaches that don't allow a sound to pass through.
Want. Want. Want. Want. Want. Want. Want. Want.  ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D

Love the layout too!!  8)
Title: Re: Creating of 2254 style compressor
Post by: iprovlek on July 17, 2016, 12:34:40 PM
I want too... insane Garry....THUMB THUMB THUMB....
 :o
Title: Re: Creating of 2254 style compressor
Post by: dirty1_1garry on July 17, 2016, 04:20:44 PM
Very interesting project ! Could you already give a price for a finished unit ?

yep, I will calculate
Title: Re: Creating of 2254 style compressor
Post by: dirty1_1garry on July 17, 2016, 04:22:56 PM
Found some more bugs :P
Sound is passing through, but no compression. I need couple night more :D
Title: Re: Creating of 2254 style compressor
Post by: Spencerleehorton on July 17, 2016, 04:33:35 PM
If you could offer me some pcbs I will debug, I can make the Ba284 and ba283 no problem.
Might be faster a couple of people on this one?

Regards

Spence.
Title: Re: Creating of 2254 style compressor
Post by: r2d2 on July 25, 2016, 01:09:12 PM
I want too... insane Garry....THUMB THUMB THUMB....
 :o

me toooooo ....
more better if with the "extra/optional" limiter
r
Title: Re: Creating of 2254 style compressor
Post by: pvision on September 10, 2016, 02:31:53 PM
I think this is a really clever idea. The Mojo of Neve kit doesn't lie in complex mechanical construction & hand-loomed wiring

Nick Froome
Title: Re: Creating of 2254 style compressor
Post by: Spencerleehorton on September 14, 2016, 03:29:50 PM
Anymore info or any further?
Title: Re: Creating of 2254 style compressor
Post by: dirty1_1garry on September 21, 2016, 03:31:25 PM
Hello everyone!

Was pretty busy last 2 or 3 weeks. But I did not waste time in vain! 8)

Here we go!
https://www.dropbox.com/s/2h6disbznp28bn7/2016-09-21%2022.00.03.mov?dl=0

So now compressor works as it should, sounds amazing (I like on drums a specially). Need to calibrate meter and check time constants.
Next step - fix a couple bugs on pcbs that I found during first run.

Hallelujah!
Title: Re: Creating of 2254 style compressor
Post by: kosi on September 21, 2016, 03:54:38 PM
Hallelujah !
I second that, sounds really good !

I'm definetely in for 2 boards !
Title: Re: Creating of 2254 style compressor
Post by: Spencerleehorton on September 22, 2016, 01:33:26 AM
Yep count me in! I've made some BA283's ready for this one just need to make the BA185 and BA191.

Let me know when you have the other pcbs ready.

Regards

Spence.
Title: Re: Creating of 2254 style compressor
Post by: pvision on September 22, 2016, 06:22:01 PM
Can anyone recommend BA283 / BA185 / BA191 boards, preferably from a seller on here?

Nick Froome
Title: Re: Creating of 2254 style compressor
Post by: kosi on September 23, 2016, 08:11:07 AM
Can anyone recommend BA283 / BA185 / BA191 boards, preferably from a seller on here?

Nick Froome

members livingnote and avdo make them
Title: Re: Creating of 2254 style compressor
Post by: dirty1_1garry on September 25, 2016, 03:31:26 PM
Can anyone recommend BA283 / BA185 / BA191 boards, preferably from a seller on here?

Soon, as I will set 2254 proto,  they will be available as a kit.
Title: Re: Creating of 2254 style compressor
Post by: livingnote on September 26, 2016, 06:16:11 PM
Well - I don't exactly make the BA283/185/191 boards - I was on a project making the
B100, B104 and B105s.
Title: Re: Creating of 2254 style compressor
Post by: dirty1_1garry on October 05, 2016, 04:19:30 AM
Well, now 2254 fully calibrated and works as it should!
All bugs on boards have corrected. Boards and front panel are redrawn.
I've added one more option - THRESHOLD and MAKE-UP GAIN can accept both, potentiometer for smooth adjusting or  rotary switch for stepped and fully recallable  adjusting.

I've calculated two kits:

- first kit will contain BA185, BA191, BA283 boards, board for joining BA cards, face board for switches and 24V psu board. This kit will be available for shipping by end of october.

- second kit will contain first kit plus face panel and 1U enclosure. This kit will be available for shipping by end of november.

Of course kits will be supplied with a full information for happy build, including step-by-step instructions :P

Who are interested -  contact me with personal message or with e-mail [email protected] (as GDIY personal message can overflow quickly)
I think that in nearly days I will open whitemarket thread for more open information about how to purchase kits.
Title: Re: Creating of 2254 style compressor {CREATED}
Post by: kosi on October 05, 2016, 04:39:37 AM
Hi,
tried to pm you, but your mailbox is full !

I want to have 2 of them

thanks a lot for doing this !!!

regards,
Andreas
Title: Re: Creating of 2254 style compressor {CREATED}
Post by: dirty1_1garry on October 05, 2016, 06:06:25 AM
Hi,
tried to pm you, but your mailbox is full !

I want to have 2 of them

thanks a lot for doing this !!!

regards,
Andreas

Yep, mailbox is ready for purchasing messages . Just send you a massage!
Title: Re: Creating of 2254 style compressor {CREATED}
Post by: Spencerleehorton on October 05, 2016, 07:56:08 AM
I'm in for a couple without faceplate.

Regards

Spence.
Title: Re: Creating of 2254 style compressor {CREATED}
Post by: TwentyTrees on October 05, 2016, 03:19:28 PM
Looks brilliant! Very elegant design. I'm in for a couple of sets without panels / enclosures - will message!
Title: Re: Creating of 2254 style compressor {CREATED}
Post by: thomasdf on October 05, 2016, 04:46:40 PM
Depending on the price I am in for a pair of kits too!!
Title: Re: Creating of 2254 style compressor {CREATED}
Post by: simonrussell77 on October 05, 2016, 06:51:25 PM
Awesome project! In for two kits here.
Title: Re: Creating of 2254 style compressor {CREATED}
Post by: dirty1_1garry on October 05, 2016, 06:54:21 PM
Ok guys, just wright me a personal message or e-mail massage)
Title: Re: Creating of 2254 style compressor {CREATED}
Post by: innercityman on October 13, 2016, 05:04:28 AM
Hi,

is there a BOM or a mouser cart for this build ?

Thanks

Title: Re: Creating of 2254 style compressor {CREATED}
Post by: dirty1_1garry on October 13, 2016, 07:53:24 AM
Hi,

is there a BOM or a mouser cart for this build ?

Thanks

I'm currently making it)

There are will be partlists, bom for mouser and banzaimusic carts, build instruction.
Title: Re: Creating of 2254 style compressor {CREATED}
Post by: dirty1_1garry on October 19, 2016, 04:47:44 AM
Preparing for making sound and video samples!)
Title: Re: Creating of 2254 style compressor {CREATED}
Post by: dirty1_1garry on October 19, 2016, 04:50:53 AM
and YEs! If one of you guys want to hear how DB54 works with your music material,  just send me the file  and I will processing it with DB54.
Title: Re: Creating of 2254 style compressor {CREATED}
Post by: dirty1_1garry on October 27, 2016, 08:03:01 AM
Hello friends!

Batch of pcbs for DB54 is coming. BA cards already purchased, but looks like I've got a small delay with unite pcbs ???

I've created google drive folder where I will accumulate all information for building DB54.
http://bit.ly/2dLli43

Now it contain partlist, bom, mouser cart link, transformer list, front panel holes dimensions.  I will update it as possible.
Title: Re: Creating of 2254 style compressor {CREATED}
Post by: Matt55 on October 28, 2016, 08:27:32 AM
Hello Igor,

I can't seem to get the Mouser cart working? I put the access ID in the project searcher box but nothing comes up?

Thanks, Matt
Title: Re: Creating of 2254 style compressor {CREATED}
Post by: dirty1_1garry on October 28, 2016, 08:44:31 AM
Hello Igor,

I can't seem to get the Mouser cart working? I put the access ID in the project searcher box but nothing comes up?

Thanks, Matt

Let me check. Yeah, my bug. Fixed.
Access ID: 33b8ed2434

For those guys who had a little Mouser experience:
Go to http://ru.mouser.com/Tools/Tools.aspx
and insert Acess ID in specific field. Voila!
Title: Re: Creating of 2254 style compressor {CREATED}
Post by: SIXTYNINER on October 28, 2016, 07:17:28 PM
for bc184, bc214, and other no longer available parts ,
have you done some test with the replacement parts as for 1073 , 1084 clones ?
cheers
Title: Re: Creating of 2254 style compressor {CREATED}
Post by: Rocinante on October 29, 2016, 02:56:46 AM
for bc184, bc214, and other no longer available parts ,
have you done some test with the replacement parts as for 1073 , 1084 clones ?
cheers
I believe the replacements are bc550 (or mpsa18) and bc560 and from what ive read the are perfectly suitable.   I seem to recall Dan Kennedy saying its what he used in the mp-2nv.
Title: Re: Creating of 2254 style compressor {CREATED}
Post by: kosi on October 29, 2016, 07:34:49 AM
here's alot of info
http://groupdiy.com/index.php?topic=51340.0

BC184C
As replacement I bought MPSA18 from ebay member hfo_poland , which have hery good hfe values, I also bought some from a shop in Italy, which had pretty low values. Tested with a cheap chinese transistor tester.
Remember to turn the MPSA around.
In my NV73 I have used BC549 and 547

BC441/2N1711 - 1
2N1711 are everywhere on ebay

BC214KC
a lot of people reported, that they used BC214C versions without problems. Keep attention, that the L version has a different leg orientation, you can try to bend them, but's really a pita...

I guess, there are many other possibilities



Title: Re: Creating of 2254 style compressor {CREATED}
Post by: iprovlek on October 30, 2016, 05:57:07 AM
BC109C,BC550C!!!
Title: Re: Creating of 2254 style compressor {CREATED}
Post by: dirty1_1garry on October 31, 2016, 04:59:24 AM
Yeah, can confirm that BC550 works perfect at BC184 place.
Title: Re: Creating of 2254 style compressor {CREATED}
Post by: dirty1_1garry on October 31, 2016, 03:28:10 PM
First proto of enclosure for DB54.
Title: Re: Creating of 2254 style compressor {CREATED}
Post by: dirty1_1garry on November 08, 2016, 04:43:59 PM
Got a call from pcb fabric. Mother boards a ready! So on this week I will start to send DB54 kits to happy owners)
Title: Re: Creating of 2254 style compressor {CREATED}
Post by: TwentyTrees on November 10, 2016, 03:15:57 AM
Woohoo! Really looking forward to this one. Thanks for keeping us updated.  ;D
Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: dirty1_1garry on November 10, 2016, 09:27:13 AM
Just add samples into DB54 build folder. Check it here:
http://bit.ly/2dLli43
File name - DB54 sound test1 .zip
It contain ProTools10 session 48kHz 24bit.
If you use other daw, search audio files folder.
I made samples of drum kit (for stereo sound I precess left and right channel consecutive), electric bass and acoustic guitar with different settings.
Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: dirty1_1garry on November 11, 2016, 04:14:30 AM
I forgot to add into previous post that I used standard attack setting - fixed exact like in original 2254.  Different attack settings will be tested in next test)
Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: dirty1_1garry on November 11, 2016, 06:42:17 AM
And... here is a short video sample:
www.dropbox.com/s/sxwuqdvnbzi5nev/DB54%20DR%20V.mov?dl=0
Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: dirty1_1garry on November 11, 2016, 02:56:20 PM
Here is how two uniting boards looks like.
But... at this moment they all sold. All kits that was made are sold  :P
Will order second batch of boards!)
Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: kosi on November 11, 2016, 06:22:44 PM
Congratulations !
You seem to be astonished about your success  ;D
And could you post a pic, where we can see the inner goods of your 2254 ?

Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: dirty1_1garry on November 13, 2016, 01:23:59 PM
And could you post a pic, where we can see the inner goods of your 2254 ?

Here is an image.
I forgot to mention that for I've sued carnhill transformers as input and interstage and EA 1166 as output.
As I've got a first serial batch of DB54 boards I will assemble it and show much in details.
Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: Murdock on November 13, 2016, 04:16:05 PM
Wow, looks great! Will definatelly buy a stereo set next month!
Couple of questions:
-How hard would it be, to incorporate a high-pass filter?
-Is there a simple way to link two of your 2254's together?
-Where did you get the EA1166? Hairball seems to only have the smaller 500 versions...
 
Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: dirty1_1garry on November 14, 2016, 10:37:12 AM
-How hard would it be, to incorporate a high-pass filter?

Hmmm, I think that it's not so hard, more then that adding sidechain hpf is in my list for experiments. And in one moment I will add it, but may be in next revision.

-Is there a simple way to link two of your 2254's together?
yes, I already made link switch in mono unit and it present same way of linking as original 2254.  Check first post for face panel example.

-Where did you get the EA1166? Hairball seems to only have the smaller 500 versions...
 
Aaah)) I got it about 3 years ago, as I heard EA don't produce them more. It sound a little bit sweeter then carnhill for my opinion with a small bump in low end.
Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: Murdock on November 14, 2016, 04:12:20 PM
Thanks alot for the infos!
I know, its probably way to early, but do you have any kind of ETA for the HPF?
Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: dirty1_1garry on November 15, 2016, 05:47:15 AM
Thanks alot for the infos!
I know, its probably way to early, but do you have any kind of ETA for the HPF?

ETA?)
Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: MrBlomski on November 15, 2016, 05:49:35 AM
ETA?)

Estimated Time of Arrival

in other words;

When is it available.


This is what I think :D
Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: Murdock on November 15, 2016, 03:16:40 PM
Haha yeah, thats what i meant. Sorry for the confusion.  ;D
Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: dirty1_1garry on November 15, 2016, 03:59:24 PM
Haha yeah, thats what i meant. Sorry for the confusion.  ;D

Will add "ETA" into my vocabulary ;D

I don't know, I think about creating 2U stereo version and sc hpf can be a nice feature.
Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: sonolink on November 17, 2016, 06:02:27 AM
Any kits for sale?

Thanks
Sono
Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: dirty1_1garry on November 17, 2016, 08:12:04 AM
Any kits for sale?

Thanks
Sono

yep, just send a PM.
I'm planning to open White Market page where will be more open info about prices.
Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: Murdock on November 17, 2016, 10:35:14 AM
Will add "ETA" into my vocabulary ;D

I don't know, I think about creating 2U stereo version and sc hpf can be a nice feature.

I don't know, but wouldn't it be possible to implement a BA182 card between the input and compressor sidechain? Or is it more complicated than that?
I'm asking, because there is someone on eBay selling some of these cards right now...
Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: dirty1_1garry on November 17, 2016, 03:49:11 PM
I don't know, but wouldn't it be possible to implement a BA182 card between the input and compressor sidechain? Or is it more complicated than that?
I'm asking, because there is someone on eBay selling some of these cards right now...

I think that the process much much simpler. It's not necessary to use inductor that exists on BA182 board.
Tell me how and when do you use sc hpf in compressors?) I use it a lot too but would like to hear other opinions.
Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: MrBlomski on November 18, 2016, 03:58:07 AM
Igor Kapelvich did once a 2254, also with HPF. it was based on a 33609 neve.


http://i251.photobucket.com/albums/gg291/diy33609/schem-1.gif

https://groupdiy.com/index.php?topic=32605.0

Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: dirty1_1garry on November 18, 2016, 05:19:16 AM
Igor Kapelvich did once a 2254, also with HPF. it was based on a 33609 neve.


http://i251.photobucket.com/albums/gg291/diy33609/schem-1.gif

https://groupdiy.com/index.php?topic=32605.0

It slightly different as IJ's version used 33609 sidechain patch and hpf was installed here, not in 2254 sidechain.
Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: MrBlomski on November 18, 2016, 05:39:09 AM
That is true. IT is more a modifaction.
Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: Spencerleehorton on November 26, 2016, 02:28:35 PM
Could you do a price for the long  pcbs rather than with the Ba cards? As I can make the other pcbs.

Regards

Spence.
Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: kosi on November 29, 2016, 06:13:26 PM
Short question while going through the BOM:

are the blue connectors for the BA boards included in the kit ?
Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: Spencerleehorton on December 01, 2016, 08:26:12 PM
i'll take that as a no then!!!
Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: Lee_M on December 03, 2016, 06:00:19 PM
I'd be interested in buying some of the BA cards, Without the long PCB's....If they're available?

Also, Are the BA192 (preamp + meter driver) cards likely to be available at any point?
I'd like to build a "full-fat" 2254, Limiter and all.
Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: r2d2 on December 05, 2016, 09:06:51 AM
any info about if it is more or less expensive than this :
http://www.audiomaintenance.com/acatalog/aml-17-029_extended_info.html

that include limiter as well....
Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: Lee_M on December 05, 2016, 10:12:03 AM
any info about if it is more or less expensive than this :
http://www.audiomaintenance.com/acatalog/aml-17-029_extended_info.html

that include limiter as well....

A full set of carnhill signal transformers (2x line inputs, 1x mic input, gapped output) as used in the EZ2254 costs about £190 including VAT and shipping within the UK, The EZ2254 kit costs about £745 with VAT and UK shipping.
Shipping will obviously add more to the price if you're further afield.

So, The EZ2254 kit (case, PSU, components, meter, etc.) without signal transformers works out at about £555 per channel.

Grayhill rotary switches are about £15 each.
I'd guess a nice case could be made for £100-150.
The "DA-S-500" Meters are about £30 each from Don-Audio...They ain't authentic, but they look nice.
The "D1010SL" type meters are more like the originals and slightly cheaper.

That leaves over £300 to spend on PCB's, PSU TX, passive components, semiconductors, shipping costs (for everything) and knobs.
DId I forget anything?
Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: dirty1_1garry on December 09, 2016, 11:16:56 AM
Hi folks!
Sorry for delays with replays on your questions, looks like I will have a wedding next week, so little vanity days right now))
Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: dirty1_1garry on December 09, 2016, 11:20:17 AM
Short question while going through the BOM:

are the blue connectors for the BA boards included in the kit ?

Blue connectors out of both kits.
You are right, I forgot to mention them in  mouser cart or in BOM list. My bug. Will try to find it on mouser and add it.
Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: dirty1_1garry on December 09, 2016, 11:22:38 AM
I'd be interested in buying some of the BA cards, Without the long PCB's....If they're available?

Also, Are the BA192 (preamp + meter driver) cards likely to be available at any point?
I'd like to build a "full-fat" 2254, Limiter and all.

Send me a PM)
Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: dirty1_1garry on December 09, 2016, 02:32:50 PM
any info about if it is more or less expensive than this :
http://www.audiomaintenance.com/acatalog/aml-17-029_extended_info.html

that include limiter as well....

Great Lee-M's review as answer on your question.

My opinion:
DB54 will cost less. How much exact? Depends on your parts. You can follow link with build info, spend a little bit of time and calcuclate exact yours cost.  DB54 contain only compressor, so minus one additional trx that used in limiter sidechain. I used lorlin switches instead expansive (but better of course) Grayhill . EZ2254 can used only Carnhill transformers, DB54 can use any suitable.
Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: kosi on December 13, 2016, 05:29:49 PM
PCBs arrived in Berlin,
they look and feel fantastic.
plus very well packed.
Really looking forward to building these.

thanks a lot !!!
Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: MrBlomski on December 14, 2016, 12:44:37 AM
Great Lee-M's review as answer on your question.

My opinion:
DB54 will cost less. How much exact? Depends on your parts. You can follow link with build info, spend a little bit of time and calcuclate exact yours cost.  DB54 contain only compressor, so minus one additional trx that used in limiter sidechain. I used lorlin switches instead expansive (but better of course) Grayhill . EZ2254 can used only Carnhill transformers, DB54 can use any suitable.

Is it possible to use Grayhill switches instead of lorins? And if so, what is the production number?

Thanks,

M
Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: RuudNL on December 14, 2016, 02:07:55 AM
Is there a schematic available, so we can see what we are talking about?
(I scanned all previous posts, but didn't find it.)
Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: 3nity on December 14, 2016, 08:57:14 AM
Great project and awesome sounding.
I dont think grayhill makes something like lorlins!
Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: dirty1_1garry on December 14, 2016, 08:58:41 AM
Is it possible to use Grayhill switches instead of lorins? And if so, what is the production number?

Thanks,

M

No, it's impossible to use Grayhils switches on DB54 boards as pcb designed with Lorlin switches seat place. For my opinion Lorlin are GOOD switches, absolutely not bad. Never had any troubles with them, they are in my first choice list. You can find them in Thermionic mastering equipment for example.
Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: TwentyTrees on December 17, 2016, 08:17:22 AM
Boards arrived today! And I have to say, they look fantastic. Really nice quality. Thanks Igor! Looking forward to getting stuck into this one in the new year...  8)
Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: Spencerleehorton on December 17, 2016, 08:55:51 AM
yes, I'm applying  my DIY approach on this one, PCBs have been made, need drilling, transformers will be wound and psu built.
nice project for next year.
Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: diystudiotoys on February 09, 2017, 02:02:11 PM
First DB54 picture  :)

Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: TwentyTrees on February 13, 2017, 07:59:30 AM
Hi Igor,

I'm probably missing something really obvious, but I'm not clear on the values of the 'attack time' resistors (R23-28 on PCB1). The BOM lists them as "?? See manual" - which manual do you mean? I can't find anything in your Google Drive folder setting that out, and haven't been able to find anything either elsewhere on GDIY or on Google. What values should we be using? Like I say, I feel I must be missing something obvious here...

Linked to that - do you have a schematic for the DB54?

Cheers!
Andy
Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: kosi on February 13, 2017, 08:14:38 AM
Also missing in the bom is the part number for the connectors, that hold the BA cards
Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: RolfGi on February 17, 2017, 02:53:33 PM
Hi Igor

The PCB`s are soldert (they are very nice) & the PSU is working..... :D
Now i need some info`s about how to hook up the transformers and later on how to calibrate the compressor......
Shematic would be nice ;)

Thank you very much
cheers

rolf
Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: cptpfeffer on February 23, 2017, 05:13:29 PM
first of my two DB54 finished ;-)
Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: kosi on February 23, 2017, 05:37:11 PM
Looks very nice, congrats !
Can you tell me the part number of the BA card connectors ?

thanks,
Andreas
Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: cptpfeffer on February 23, 2017, 06:05:28 PM
Hi Andreas, hab die in ebay (aus Hong Kong ) geschossen. ca. 2 EUR das Stück....
Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: cptpfeffer on February 23, 2017, 06:08:10 PM
http://www.ebay.de/itm/10-Card-Edge-Connector-2x18-Pin-36-Pin-Gold-Slot-PCB-Panel-Solder-Socket-Harness-/291761929882?hash=item43ee5dbe9a:g:usYAAOSwvU5XNCo7
Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: kosi on February 24, 2017, 06:08:29 AM
thanks a lot !
Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: tommypiper on February 24, 2017, 09:56:31 PM
Is there a schematic available, so we can see what we are talking about?
(I scanned all previous posts, but didn't find it.)

No schematic for this project?  Or is it an exact clone?  ? ???
Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: TwentyTrees on February 25, 2017, 01:50:13 PM
Great build, cptpfeffer! Love the autograph.  8) Thanks for the BA card link as well, have snaffled a set for myself too.
Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: Zergonion on March 06, 2017, 02:37:06 PM
Hi all!
I'm in a process of gathering all the part for this project an I need some help.

1) Is this power trafo good? http://www.banzaimusic.com/Talema-TRT30215.html
2) Which BC184C transistors need to be matched with each other, it's hidden in the BOM?
3) I'm also curious about those ??? resistors (R23 - R28) used for attack?
Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: cptpfeffer on March 06, 2017, 03:59:49 PM
Hi all!
I'm in a process of gathering all the part for this project an I need some help.

1) Is this power trafo good? http://www.banzaimusic.com/Talema-TRT30215.html

ok :-)

2) Which BC184C transistors need to be matched with each other, it's hidden in the BOM? 

best is, match all as close as possible.

3) I'm also curious about those ??? resistors (R23 - R28) used for attack?

R23 - 1K2 (0.5ms)
R24 - 1K3 (1ms)
R25 -  1K8(5ms)
R26 - 2K (12ms)
R27 - 2K2(25ms)
R28 - 2K7 (50ms)


Greets, Bernd
Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: TwentyTrees on March 08, 2017, 04:46:01 AM
Thanks Bernd - much appreciated. Out of curiosity, can I ask where you got / how you calculated the attack resistor values? I spent a good few hours trawling for that info and couldn't find anything, so I'm keen to learn!

Andy
Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: cptpfeffer on March 08, 2017, 04:47:25 AM
Thanks Bernd - much appreciated. Out of curiosity, can I ask where you got / how you calculated the attack resistor values? I spent a good few hours trawling for that info and couldn't find anything, so I'm keen to learn!

Andy

Hi Andy, I got the values directly from Igor, who created the kit ;-)
Greets, Bernd
Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: TwentyTrees on March 08, 2017, 04:56:26 AM
...Yep, that would make sense I guess!  ;D Thanks again for sharing - time to start ordering parts...
Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: Zergonion on March 08, 2017, 02:36:26 PM
Thank you, Bernd!

Yay, shopping spree! ;D
Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: weiss on March 20, 2017, 09:52:36 PM
great project, man! i would love to try one out some day!
Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: dirty1_1garry on March 25, 2017, 06:18:36 AM
Hello folks! I'm here.
Wedding and the birth of a daughter turned me out of diy life . Now my brain has barely got rid of sleepless nights and changing diapers so I have some helpful info regards DB54 assembling.
As I heard there are several assembled DB54. It will be nice to hear  reviews from you guys.
Now we are order third batches of boards kits.

Well, in next few replays I will post some and answer on questions.
Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: dirty1_1garry on March 25, 2017, 06:23:22 AM
So long awaited - DB54 assemble manual!)

I've updated BOM a little bit, so BOM v1.1 is now valid.

Check both in DB54 google disk folder:
http://bit.ly/2dLli43
Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: dirty1_1garry on March 25, 2017, 06:28:16 AM
Here was a couple questions regards BA191 diodes direction.
I've created a small file with investigating that question.
Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: TwentyTrees on March 25, 2017, 07:25:58 AM
Congratulations Igor, sounds like you've had a pretty busy time! All best wishes for the wedding and birth of your daughter - and thanks for the updated info!
Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: dirty1_1garry on March 25, 2017, 08:49:22 AM
Congratulations Igor, sounds like you've had a pretty busy time! All best wishes for the wedding and birth of your daughter - and thanks for the updated info!

Thanks man!)
Title: Re: Creating of 2254 style compressor {CREATED} samples added!
Post by: dirty1_1garry on March 25, 2017, 08:51:06 AM
Answers on previews questions:


I'm probably missing something really obvious, but I'm not clear on the values of the 'attack time' resistors (R23-28 on PCB1). The BOM lists them as "?? See manual" - which manual do you mean? I can't find anything in your Google Drive folder setting that out, and haven't been able to find anything either elsewhere on GDIY or on Google. What values should we be using? Like I say, I feel I must be missing something obvious here...
Andy
check assemble guide page 14

The PCB`s are soldert (they are very nice) & the PSU is working..... :D
Now i need some info`s about how to hook up the transformers and later on how to calibrate the compressor...
rolf
check assemble guide page 17 and 18

Can you tell me the part number of the BA card connectors ?
Andreas
check assemble guide page 5

No schematic for this project?  Or is it an exact clone?  ? ???
thats not an exact clone

1) Is this power trafo good? http://www.banzaimusic.com/Talema-TRT30215.html
2) Which BC184C transistors need to be matched with each other, it's hidden in the BOM?
3) I'm also curious about those ??? resistors (R23 - R28) used for attack?

1) good
2) TR1 and TR2 on BA185 should be matches pair (hfe matched)
3) check assemble guide page 14



Title: Re: DB54 - Creating of 2254 style compressor {update 25.03.17 - assembly guide aded}
Post by: kosi on March 26, 2017, 05:11:39 PM
There's a small typo in the assemble guide:
In the input transformers choice, on page 6, 10468 types it has to be Sowter 9145. You wrote 9045 (but that's the Carnhill number)

I ordered my mouser cart today :)
Title: Re: DB54 - Creating of 2254 style compressor {update 25.03.17 - assembly guide aded}
Post by: dirty1_1garry on March 27, 2017, 08:52:02 AM
I ordered my mouser cart today :)
congrats!

There's a small typo in the assemble guide:
In the input transformers choice, on page 6, 10468 types it has to be Sowter 9145. You wrote 9045 (but that's the Carnhill number)
Oops, you are write
Title: Re: DB54 - Creating of 2254 style compressor {update 25.03.17 - assembly guide aded}
Post by: dirty1_1garry on April 02, 2017, 12:58:09 PM
Here is how DB54 "B" kit enclosure looks like 8)
Title: Re: DB54 - Creating of 2254 style compressor {update 25.03.17 - assembly guide aded}
Post by: federalsound on May 11, 2017, 12:32:21 PM
A schematic would make this 100 times more easy to build and troubleshoot. It makes me a bit crazy actually.
Is it possible for you to upload the schematic? That usually the case when building a project that you pay for.
I don't really understand why its so secret. It its so sensitive, can you atleast give the schematic to the members that paid you kinda lots of money?  I might come off as sounding a bit unfriendly, but I asure you I'm not  :) :o :P 8) ;D
Title: Re: DB54 - Creating of 2254 style compressor {update 25.03.17 - assembly guide aded}
Post by: federalsound on May 12, 2017, 10:09:34 AM
It seems that R50 isn't needed if using pots.
Title: Re: DB54 - Creating of 2254 style compressor {update 25.03.17 - assembly guide aded}
Post by: frederickalonso on November 09, 2017, 06:34:50 AM
https://www.instagram.com/p/BbOKnUbngGU/?igref=ogexp (https://www.instagram.com/p/BbOKnUbngGU/?igref=ogexp)

Starting this build! :)
Title: Re: DB54 - Creating of 2254 style compressor {update 25.03.17 - assembly guide aded}
Post by: frederickalonso on November 10, 2017, 06:50:32 PM
It seems that R50 isn't needed if using pots.
Did you had an issue with this R50?

I contacted Igor because the latest BOM had 2 times the same resistor see 1k2 and 1k8.

The more we know, the better the build.
Title: Re: DB54 - Creating of 2254 style compressor {update 25.03.17 - assembly guide aded}
Post by: Zergonion on January 04, 2018, 05:53:13 AM
Hi all!
I need some help with the power trafo http://www.banzaimusic.com/Talema-TRT30215.html
I wired secondaries in serial, center tap (which should give me 30V ac), but when I connect it to the electricty the trafo gets really hot and the measured voltage on each wire is 7.5V. I used 250mA as well as 500mA fuse, but no luck. Shoud I get new trafo?
Title: Re: DB54 - Creating of 2254 style compressor {update 25.03.17 - assembly guide aded}
Post by: TwentyTrees on January 04, 2018, 10:30:47 AM
Hi Zergonion,

This happened to me too, and alarmed the bejeezus out of me! I was able to get it fixed. I think it was about the ground wiring - I've a feeling that what I thought was a CT connection on the PSU board was in fact a ground connection, and I had to run the toroid secondaries in series without a centre tap, but I'd need to check my notes and photos as it was a little while ago. It'll be a couple of days before I get the chance to, but I'll post back here when I've checked!

I have to say that the DB54 sounds amazing when all done - buttery loveliness!

Andy

Hi all!
I need some help with the power trafo http://www.banzaimusic.com/Talema-TRT30215.html
I wired secondaries in serial, center tap (which should give me 30V ac), but when I connect it to the electricty the trafo gets really hot and the measured voltage on each wire is 7.5V. I used 250mA as well as 500mA fuse, but no luck. Shoud I get new trafo?
Title: Re: DB54 - Creating of 2254 style compressor {update 25.03.17 - assembly guide aded}
Post by: Winetree on January 04, 2018, 02:35:43 PM
Are full kits still available?
If so, cost?
Title: Re: DB54 - Creating of 2254 style compressor {update 25.03.17 - assembly guide aded}
Post by: Lee_M on January 04, 2018, 08:20:03 PM
Hi all!
I need some help with the power trafo http://www.banzaimusic.com/Talema-TRT30215.html
I wired secondaries in serial, center tap (which should give me 30V ac), but when I connect it to the electricty the trafo gets really hot and the measured voltage on each wire is 7.5V. I used 250mA as well as 500mA fuse, but no luck. Shoud I get new trafo?

What mains voltage are you on?

Going by the fact you're only getting 7.5v, is it possible you're using a 240v primary winding on 120v mains?
Title: Re: DB54 - Creating of 2254 style compressor {update 25.03.17 - assembly guide aded}
Post by: TwentyTrees on January 05, 2018, 02:14:13 AM
I've checked through my notes, and I was right - the '0V' connection on the PSU next to the power transformer secondary connection is not a centre tap but is, I think, signal ground. By connecting the toroid secondary windings in series to the 'VAC in' (isolating the join, natch), and connecting both the '0V' and 'Cha' points on the PSU to the chassis, I got the right voltages and my toroid stopped trying to melt itself(!). Pic of my build below, hopefully you can see the wiring bottom left to see what I mean.

A couple of other things that caught me out at first, from the notes: the 'Bypass' switch operated the other way round than I expected, so I had to hack the switch and rewire a couple of points to match my panel; audio polarity got flipped somewhere at first, easily fixed by swapping a couple of molex headers (possibly just my wiring!); and I can't  get the meters to accurately reflect gain reduction over their whole range, but it's not a huge problem as I set by ear anyway.

It is a lovely piece now that it's all working. I ran some overly thin string stems through it a couple of days ago, and quite apart from the gentle dynamic control it smoothed out all the spiky, harsh top end and left them sounding much more lush and full then before. Would love a sidechain HPF- something for the Mark II?
Title: Re: DB54 - Creating of 2254 style compressor {update 25.03.17 - assembly guide aded}
Post by: TwentyTrees on January 05, 2018, 02:20:58 AM
And the front (just because  ;D)...
Title: Re: DB54 - Creating of 2254 style compressor {update 25.03.17 - assembly guide aded}
Post by: Zergonion on January 05, 2018, 03:21:50 AM
Hi TwentyTrees!
Thank you for all infos. Yes at first I connected the CT to 0V on PSU board and the trafo . Now it's connected to the chasis/star ground and it works as it should :)
Yesterday I wanted to attach the front panel but quickly found out that the lips on top and bottom panels are hitting the vu meter, so more cutting and drilling.
BTW, nice looking stereo comp!
Title: Re: DB54 - Creating of 2254 style compressor {update 25.03.17 - assembly guide aded}
Post by: TwentyTrees on January 05, 2018, 04:24:47 PM
You're very welcome, glad to hear you got it all sorted out. Good luck with the panels and the meter! I hate metalwork...

BTW, nice looking stereo comp!
Thanks! I'm quite pleased with how it turned out.  8)
Title: Re: DB54 - Creating of 2254 style compressor {update 25.03.17 - assembly guide aded}
Post by: Murdock on January 05, 2018, 04:57:23 PM
Would love a sidechain HPF- something for the Mark II?


Yes please! If this would happen I would immediately build a stereo set!
Title: Re: DB54 - Creating of 2254 style compressor {update 25.03.17 - assembly guide aded}
Post by: MrBlomski on January 06, 2018, 09:33:06 AM
So a 30va 2x15v 1A is enough to power both channels?
Title: Re: DB54 - Creating of 2254 style compressor {update 25.03.17 - assembly guide aded}
Post by: TwentyTrees on January 06, 2018, 09:42:36 AM
Yep, 30VA 2x15V toroid works fine here.

So a 30va 2x15v 1A is enough to power both channels?
Title: Re: DB54 - Creating of 2254 style compressor {update 25.03.17 - assembly guide aded}
Post by: Zergonion on January 09, 2018, 02:22:08 AM
So, my unit is all wired up, power supply is working fine (+24V), I also did the "Bias calibration" 2,3VDC. Then I ran into a problem when trying to do the "unity gain cal." - when compression switch is off, the sound is coming through; but when I switch it on, the sound dissapperas (there's only a small ammount of bleed-through).
I checked all connections, there's no cold solder and I have no idea where to start with troubleshooting.  Is there a procedure how to check were the signal gets lost?

TwentyTrees - what transistors did you use for your unit, BC184 or a replacement?
Title: Re: DB54 - Creating of 2254 style compressor {update 25.03.17 - assembly guide aded}
Post by: MrBlomski on January 09, 2018, 02:25:34 AM
BC184c = BC550
Title: Re: DB54 - Creating of 2254 style compressor {update 25.03.17 - assembly guide aded}
Post by: TwentyTrees on January 09, 2018, 03:19:29 AM
TwentyTrees - what transistors did you use for your unit, BC184 or a replacement?

I used MPSA18 for the BC184 - flipped 180', and HFE matched as close as possible.

In terms of troubleshooting, before you get stuck in following the input, have you checked your voltages on the BA card connectors to make sure all is well there? There are schematics out there for each of the BA cards used in the 2254 which show what pins are what.

Once you're happy with that, do you have a scope that you can use to follow the signal through your unit? Alternatively, a "sniffer" probe? (I've used a test probe croc-clipped to a small battery powered speaker in a pinch - not elegant, but functional - there are doubtless better ways to put one together!) Then I'd just follow your input signal from the input xlr through each section of the circuit to see where it disappears. A proper schematic for the DB54 would make this much easier (hint hint Garry!), but the 2254 and BA card schematics should help.

Good luck!
Title: Re: DB54 - Creating of 2254 style compressor {update 25.03.17 - assembly guide aded}
Post by: mrdarwin on January 14, 2018, 10:33:47 AM
Hi there!
Stuffing my boards....
what about JP1 jumper 2 pins? It's not mentionned in calibration procedure... does it bypass/pass the unit without the front switch?
Title: Re: DB54 - Creating of 2254 style compressor {update 25.03.17 - assembly guide aded}
Post by: TwentyTrees on January 14, 2018, 11:30:41 AM
Good question! I jumped it and that was that. Looking at the PCB traces though, it looks like it might bypass a zobel network on the output transformer secondaries...

Hi there!
Stuffing my boards....
what about JP1 jumper 2 pins? It's not mentionned in calibration procedure... does it bypass/pass the unit without the front switch?
Title: Re: DB54 - Creating of 2254 style compressor {update 25.03.17 - assembly guide aded}
Post by: zerodb on January 26, 2018, 10:23:35 PM
I have some BA 191/185/283 boards here, which are either AVD or Garash; not sure how I'd tell tbh.
Anyway, working my way through the PCBs here:

R1->R11 stepped threshold
R13->R22 ratio values
R23->R28 stepped attack
R29 min attack time
R30->R38 release values
R39 makeup gain pot->gnd
R40->R49 stepped makeup
R51 parallel on interstage secondary
R52 BA283 T->gain trim
R53 power drop
R54 BA283 J->K feedback
R55 main power drop
R56 Op secondary zobel

Which leaves...
R12 7R5
R50 1k
R57 620ohm

Now, from the 2254E schematic, there should be two resistors forming a potential divider from BA283 F->R->gnd which drive the meter op feed; these are R31,R32 (560,1k5). I suspect that this is R50, and the meter is directly off BA185 B (GR signal).

R57 is suspiciously directly next to R56, so I wonder if it's an alternative value for the Zobel?
As for R12, no idea; it's almost trivially small and next to the ratio resistors.

I don't have PCB1/PCB2 here. Would anyone consider taking a look/photo of the PCB to confirm my theories?
I'll even have a go at making schematics! :D

Dave.
Title: Re: DB54 - Creating of 2254 style compressor {update 25.03.17 - assembly guide aded}
Post by: djn111 on January 30, 2018, 01:22:08 PM
Hi,

I was wondering, is there still a pcb set available ?

Or someone who has not build his set jet ?

Kind regards DJN
Title: Re: DB54 - Creating of 2254 style compressor {update 25.03.17 - assembly guide aded}
Post by: diystudiotoys on January 31, 2018, 12:44:04 PM
Hello!
We have few kits in stock right now and waiting more in February.
check here www.diystudiotoys.com


Hi,

I was wondering, is there still a pcb set available ?

Or someone who has not build his set jet ?

Kind regards DJN
Title: Re: DB54 - Creating of 2254 style compressor {update 25.03.17 - assembly guide aded}
Post by: mrdarwin on February 17, 2018, 10:36:12 AM
Hi there!
How do I have to connect the meter? The "+" on molex Xmeter is on the right, like "+" on molex Xlight?
what resistor value for lighting 8027B meter?
Title: Re: DB54 - Creating of 2254 style compressor {update 25.03.17 - assembly guide aded}
Post by: mrdarwin on February 19, 2018, 12:55:44 PM
Unit finished... and some problems:

1. psu
loaded with 2x15v xformer, 30VAC, and around 45v dc out... 1k trim  not working...  so loaded with 18vac and around 24v ok
did you mount psu inside 1u rack case? got 100hz big hum when compression engaged... no hum with off board 24v psu.

2. BA283 bias
I can/t get 2.3vDC... max is 5/6v DC... my trimmer is a 4k7(?)

3. meter range
wrong range of compression indicated, and can't correct it with trimmer... probably due to my old 8027b, have to try with other one.
Title: Re: DB54 - Creating of 2254 style compressor {update 25.03.17 - assembly guide aded}
Post by: slipperyflax on February 24, 2018, 06:43:04 PM
Twentytrees have you summed up what your total project cost was?  Or maybe an estimate :)
Title: Re: DB54 - Creating of 2254 style compressor {update 25.03.17 - assembly guide aded}
Post by: TwentyTrees on February 25, 2018, 01:47:46 PM
Hey Slippery,

I’ve not got exact figures to hand as I spread the orders over a long period, but I’d estimate maybe £4-500 per channel for a stereo build - of which a large part was transformers (6 Carnhills for two channels) and the panel, which was powder coated and engraved by Frank.

Not cheap, but probably my favourite build so far. Wish I could get the meters to track again reduction accurately over the whole range, but no matter, it forces me to use my ears!

(The meters on my unit track g/r accurately to about 4dB but then the scale goes way out - no matter how I set them up I couldn’t get them accurate across the whole meter range).

Cheers,
Andy

Twentytrees have you summed up what your total project cost was?  Or maybe an estimate :)
Title: Re: DB54 - Creating of 2254 style compressor {update 25.03.17 - assembly guide aded}
Post by: mrdarwin on February 26, 2018, 12:24:47 AM
Please, what resistor value did you use for lightning 8027 meter?
Title: Re: DB54 - Creating of 2254 style compressor {update 25.03.17 - assembly guide aded}
Post by: mrdarwin on February 27, 2018, 10:49:32 AM
Finished unit, same problem with meter...
probably due to sifam's clone meter, range is ok with another 1mA scale meter... but which doesnt fit in the unit...

Hey Slippery,

I’ve not got exact figures to hand as I spread the orders over a long period, but I’d estimate maybe £4-500 per channel for a stereo build - of which a large part was transformers (6 Carnhills for two channels) and the panel, which was powder coated and engraved by Frank.

Not cheap, but probably my favourite build so far. Wish I could get the meters to track again reduction accurately over the whole range, but no matter, it forces me to use my ears!

(The meters on my unit track g/r accurately to about 4dB but then the scale goes way out - no matter how I set them up I couldn’t get them accurate across the whole meter range).

Cheers,
Andy
Title: Re: DB54 - Creating of 2254 style compressor {update 25.03.17 - assembly guide aded}
Post by: frederickalonso on September 25, 2018, 10:08:11 AM
I have 2 working units but for some reason I have in Bypass the original sound at same levels as source.
Once I switch to compressor ON > leds all work, sound is there and compression settings work. The problem at Compressor ON = I hear 20% compared to original level and If I tweak the 5K I can make it a little louder but on both compressors I have too much noise that the unit is basically not ready for use in the studio. Can it be the 2N3055G is defect?

Update: While searching for problems I touched by accident the pins from my Carnhill VTB9045 and now one of the two units has a very loud hiss noise.

Bit frustrated here. I ordered 4 new 2N3055G's to match them and a bunch new BC109C's to replace BC550C's.
I hope this fixes the issues.
Will keep you updated If this make sense. Based upon 109 vs 550 there should be less noise on the opamp stage.
Title: Re: DB54 - Creating of 2254 style compressor {update 25.03.17 - assembly guide aded}
Post by: frederickalonso on September 25, 2018, 11:12:41 AM
A small shot from the Unit when Compressor mode is on..

https://www.instagram.com/p/BoJYfeOnn-I/?taken-by=alonso.frederick (https://www.instagram.com/p/BoJYfeOnn-I/?taken-by=alonso.frederick)
Title: Re: DB54 - Creating of 2254 style compressor {update 25.03.17 - assembly guide aded}
Post by: frederickalonso on September 27, 2018, 09:47:33 AM
Most issues are fixed now. So I replaced both 2N3055G's and on the bad ones of the two I replaced the R7 (47R/1W) resistor.
For some reason this was the guy that gave all those issues.

When calibrating I had 2.3Vdc but after 30 second it started to rise like hell.
That gave the 2N3055 probably too much voltage which caused this hiss/hum noise.

To be sure I also replaced the matched pairs on BA185 with new BC109's.

Long story short. I have a nice sounding unit now.
Just the volume in compression mode is not yet right.
Maybe this is the difference in tranfo setup. I used all Carnhill's stages. (9045, 9046, 1148)

Happy I finally can start using it. 8)
Title: Re: DB54 - Creating of 2254 style compressor {update 25.03.17 - assembly guide aded}
Post by: dirty1_1garry on September 27, 2018, 04:18:11 PM
Hi folks!
Did I miss something?)
If you need my help - feel free to contact me directly.

Igor
Title: Re: DB54 - Creating of 2254 style compressor {update 25.03.17 - assembly guide aded}
Post by: frederickalonso on September 29, 2018, 12:56:52 AM
Hi folks!
Did I miss something?)
If you need my help - feel free to contact me directly.

Igor

Hi Garry,

I just want to ask if you have an idea what can be the problem in volume drop when the compressor is switched in.
Bypass vs comp in = 40% difference in volume at this moment.
No hum or hiss, all the rest is working fine and I love the units.

Maybe transformer related? I used all Carnhill transformers on all 3 stages.

I could PM you but on this forum it could help other people here as well.
Title: Re: DB54 - Creating of 2254 style compressor {update 25.03.17 - assembly guide aded}
Post by: dirty1_1garry on September 29, 2018, 06:42:21 AM
Hi Garry,

I just want to ask if you have an idea what can be the problem in volume drop when the compressor is switched in.
Bypass vs comp in = 40% difference in volume at this moment.
No hum or hiss, all the rest is working fine and I love the units.

Maybe transformer related? I used all Carnhill transformers on all 3 stages.

I could PM you but on this forum it could help other people here as well.

Check transformer wiring first. Then I can recommend to measure signal level during signal chain, as originally you should not get a such level drop.
Title: Re: DB54 - Creating of 2254 style compressor {update 25.03.17 - assembly guide aded}
Post by: frederickalonso on September 30, 2018, 02:17:37 AM
Check transformer wiring first. Then I can recommend to measure signal level during signal chain, as originally you should not get a such level drop.

I followed the numbers from the Wiring Guide correctly. The only thing that I can try is switch the output transformer so the used input side becomes the output and vice versa. But don't think this will make much difference and is a good idea.
I took a good look on the Carnhill transfo pdf and from their numbers vs yours it's just the same.

 
Would love to know some measure levels on the BA card pins for example from a working unit so I can dig deeper.
Strange enough I have it on both units > same voltages and levels on both.

Title: Re: DB54 - Creating of 2254 style compressor {update 25.03.17 - assembly guide aded}
Post by: dirty1_1garry on October 01, 2018, 08:36:54 AM
I followed the numbers from the Wiring Guide correctly. The only thing that I can try is switch the output transformer so the used input side becomes the output and vice versa. But don't think this will make much difference and is a good idea.
I took a good look on the Carnhill transfo pdf and from their numbers vs yours it's just the same.

 
Would love to know some measure levels on the BA card pins for example from a working unit so I can dig deeper.
Strange enough I have it on both units > same voltages and levels on both.

Yes, if tranformers wiring is Ok, next step would be check signal level during sound path.
Send 1Vac to the input trx and measure level at points:
1) after input trx (pin7)
2) before (pin2) and after(pin7) of interstage trx
3) output pot pin3
4) BA283 card pin F
5) output trx secondary
Title: Re: DB54 - Creating of 2254 style compressor {update 25.03.17 - assembly guide aded}
Post by: frederickalonso on October 09, 2018, 07:47:44 AM
Yes, if tranformers wiring is Ok, next step would be check signal level during sound path.
Send 1Vac to the input trx and measure level at points:

1) after input trx (pin7) = 0,1Vac
2) before (pin2 = 0,1Vac) and after(pin7 = 0,1Vac) of interstage trx
3) output pot pin3 = 0,1Vac
4) BA283 card pin F = 0,1Vac
5) output trx secondary = 0,1Vac

I also have put 1Vac on the interstage to test a little bit more...
on pin 2 and after pin 7 of interstage trx and then I have these results:

1) after input trx (pin7) = 0,5Vac
2) before (pin2 = 1Vac where I feed 1V) and after(pin7 = 1Vac) of interstage trx
3) output pot pin3 = 1Vac
4) BA283 card pin F = 1Vac
5) output trx secondary = 1Vac
Title: Re: DB54 - Creating of 2254 style compressor {update 25.03.17 - assembly guide aded}
Post by: dirty1_1garry on October 12, 2018, 06:31:39 AM
I also have put 1Vac on the interstage to test a little bit more...
on pin 2 and after pin 7 of interstage trx and then I have these results:

1) after input trx (pin7) = 0,5Vac
2) before (pin2 = 1Vac where I feed 1V) and after(pin7 = 1Vac) of interstage trx
3) output pot pin3 = 1Vac
4) BA283 card pin F = 1Vac
5) output trx secondary = 1Vac

Hi!
31267 as input trx here wires for stepdown, so that's Ok that you get less Vac on secondary.
10468 as interstage transformer here is wired for 1.2K:4.8K, step up.  So it will gives more Vac on output then on input. But as it connected as balanced on input with center tap,  you could not just send 1V on pin2 (yes, I was wrong that you can), or you should disconnect all primary winding for making a measure.
Check that screen from 3/4 pin do not connect to ground.

Do you already adjust gain trim pot?
like described on page 18 of assemble guide:
https://drive.google.com/drive/folders/0B7-dE6xaVqWXUlNHREw1ZlJkWUE

Check and let me know again.

May be I just will assemble one more DB54 by my self and check what Vac's I have.

Title: Re: DB54 - Creating of 2254 style compressor {update 25.03.17 - assembly guide aded}
Post by: frederickalonso on October 12, 2018, 09:18:25 AM
Hmmm, this was interesting.

So I disconnected the ground wire as it normally should be like but this made a huge difference on the
47R voltage which should be 2.3VDC.

I removed the ground on pin 3 and 4 at the interstage transformer and adjusted (calibrated) the 47R again.
This fixed my issue.

So before the modification I had 2.3VDC  on R7 (47R) and after the ground removal I had something like 5VDC that needed a calibration again to 2.3VDC.

Why this fixed the issue, I cannot get it.  ::)

But It's working fine now! So happy! 1/3 more gain then input volume now, and a nice low end.
Thanks Igor!
Title: Re: DB54 - Creating of 2254 style compressor {update 25.03.17 - assembly guide aded}
Post by: dirty1_1garry on October 12, 2018, 01:08:01 PM
Hmmm, this was interesting.

So I disconnected the ground wire as it normally should be like but this made a huge difference on the
47R voltage which should be 2.3VDC.

I removed the ground on pin 3 and 4 at the interstage transformer and adjusted (calibrated) the 47R again.
This fixed my issue.

So before the modification I had 2.3VDC  on R7 (47R) and after the ground removal I had something like 5VDC that needed a calibration again to 2.3VDC.

Why this fixed the issue, I cannot get it.  ::)

But It's working fine now! So happy! 1/3 more gain then input volume now, and a nice low end.
Thanks Igor!

Well, I cant say that I understand everything what you've done, however I'm happy that it helps)
Title: Re: DB54 - Creating of 2254 style compressor {update 12.10.18}
Post by: dirty1_1garry on October 12, 2018, 04:08:05 PM
News for today.
9 kits left from third batch, with or without cases.
Contact me via PM or via email in profile.
Title: Re: DB54 - Creating of 2254 style compressor {update 12.10.18}
Post by: dirty1_1garry on November 23, 2018, 11:30:37 AM
Hi guys!
I’m in the process of assembling one more DB54.
So if anyone want to clarify any build aspects - welcome!) I can not just answer your questions but also check them twice on new real device.
Title: Re: DB54 - Creating of 2254 style compressor {update 12.10.18}
Post by: dirty1_1garry on November 23, 2018, 11:36:35 AM
And one more news!
Black Friday Sale!
Contact our DB54 kit reseller till Monday and get your kit cheaper!)
Title: Re: DB54 - Creating of 2254 style compressor {update 12.10.18}
Post by: dirty1_1garry on December 06, 2018, 11:19:46 AM
One more DB54 was born!
Will post some video samples during a week.
Title: Re: DB54 - Creating of 2254 style compressor {update 12.10.18}
Post by: Ry on February 21, 2019, 08:02:24 AM
Hi All,

At first this is a great project the boards are great. Thanks for that.
There is only one thing I see in the bom at the resister value. On 1k2 and 1k8 is both BA283R19 written which is the correct one?

Thanks for the info.
Title: Re: DB54 - Creating of 2254 style compressor {update 12.10.18}
Post by: dirty1_1garry on February 21, 2019, 06:25:37 PM
1K8 - correct value