Now 2254 fully calibrated and works as it should!

Here is an updated front panel:


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.



« Last Edit: October 12, 2018, 03:10:14 PM by dirty1_1garry »


thomasdf

Re: Creating of 2254 style compressor
« Reply #1 on: May 13, 2016, 03:15:31 PM »
Bravo!!

iprovlek

Re: Creating of 2254 style compressor
« Reply #2 on: May 13, 2016, 03:19:51 PM »
Great man!!!

This will be PROJECT!!!! 8)

Re: Creating of 2254 style compressor
« Reply #3 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!)

Re: Creating of 2254 style compressor
« Reply #4 on: May 24, 2016, 08:53:17 AM »
a little bit of progress here!

Rocinante

Re: Creating of 2254 style compressor
« Reply #5 on: May 24, 2016, 10:24:14 AM »
Yes, yes bravo!!
If there's a harder way to do this, I haven't found it yet.

evilcat

Re: Creating of 2254 style compressor
« Reply #6 on: May 24, 2016, 01:45:17 PM »
Awesome man! I'll keep an eye on this one!!!

Spencerleehorton

Re: Creating of 2254 style compressor
« Reply #7 on: May 25, 2016, 04:43:43 AM »
Rubbing my hands together for a 2U stereo version of this!!!!

;)
website: www.mohawkstudios.co.uk
email: [email protected]

If it hisses its probably the wrong impedance!!!
Or a snake!!!

Re: Creating of 2254 style compressor
« Reply #8 on: May 25, 2016, 04:53:28 AM »
Rubbing my hands together for a 2U stereo version of this!!!!

;)

Why not.

Spencerleehorton

Re: Creating of 2254 style compressor
« Reply #9 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.
website: www.mohawkstudios.co.uk
email: [email protected]

If it hisses its probably the wrong impedance!!!
Or a snake!!!


Re: Creating of 2254 style compressor
« Reply #10 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)

Spencerleehorton

Re: Creating of 2254 style compressor
« Reply #11 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.
website: www.mohawkstudios.co.uk
email: [email protected]

If it hisses its probably the wrong impedance!!!
Or a snake!!!

Re: Creating of 2254 style compressor
« Reply #12 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:)

Re: Creating of 2254 style compressor
« Reply #13 on: May 26, 2016, 02:05:35 PM »
this is how it will work

Rocinante

Re: Creating of 2254 style compressor
« Reply #14 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?
If there's a harder way to do this, I haven't found it yet.

Spencerleehorton

Re: Creating of 2254 style compressor
« Reply #15 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.
website: www.mohawkstudios.co.uk
email: [email protected]

If it hisses its probably the wrong impedance!!!
Or a snake!!!

Re: Creating of 2254 style compressor
« Reply #16 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!)

Winetree

Re: Creating of 2254 style compressor
« Reply #17 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

nielsk

Re: Creating of 2254 style compressor
« Reply #18 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...

Re: Creating of 2254 style compressor
« Reply #19 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 :)


 

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