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Project Specific Discussions => Filters/Equalizers => Topic started by: bruno2000 on August 24, 2010, 10:20:14 AM

Title: Dual Mid 1084 Clone Project
Post by: bruno2000 on August 24, 2010, 10:20:14 AM
I’ve always wanted a rack of 1084s, but they are really expensive!  So I decided to build my own.  Since I was building my own, I wanted more EQ control, and some more frequencies, especially in the bottom end region, so there are two mid band sections.  On the lower mid band selector, I added a Carnhill HPF inductor and the appropriate caps to enable peaking at some additional lower frequencies.  I left out the LPF entirely since in practice, I hardly ever used it.  

A am also a big fan of the 1073, so I  made the “Hi Q” switch position to match the “Q” of the 1073 (a little sharper than the 1084), getting the best of both worlds.

The rack is a Dumpster Prize (green, huh?), and the faceplates are custom 2"x7" from FPE.  The transformers, inductors, and switches came from Colin at Audio Maintenance.
Best,
Bruno2000

(http://dopplerstudios.com/pictures/1084-1-1.jpeg)

(http://dopplerstudios.com/pictures/1084-2-1.jpeg)
Title: Re: Dual Mid 1084 Clone Project
Post by: okgb on August 24, 2010, 10:31:17 AM
nice work all around
but it's not greener than me [ envy ! ]
Title: Re: Dual Mid 1084 Clone Project
Post by: briomusic on August 24, 2010, 10:39:47 AM
 :o :o
great project and kudos for seeing this through all on your own!
at first I thought "how does he fit all the switches in" but then I saw it's not actually 500/51x format. ::)
i am not sure if you are planning to release pcb files, or indeed do a run of pcbs (I am sure interest would be there, especially as a mic pre seems to be included as well), but one thing I would really like to know is the value of the "Q resistor" that you used to achieve a 1073-like bandwidth. I believe it's R51 (7k5) in the original schematic, on the PPEQN it's R17 with a choice of 2k7 or 6k8 (or anything in between).

that's quite a lot of iron colin had to send over the atlantic!
Title: Re: Dual Mid 1084 Clone Project
Post by: Ptownkid on August 24, 2010, 10:50:18 AM
wowsers....things like this are starting to motivate me to get on it this winter...but I also have a huge boat restoration project in the works so I may only get a handful of unit finished. Where the time goes I don't know.

Really, really, nice work bruno!
Title: Re: Dual Mid 1084 Clone Project
Post by: mitsos on August 24, 2010, 10:52:04 AM
that is real nice man! wish I had a couple of those!
Title: Re: Dual Mid 1084 Clone Project
Post by: desol on August 24, 2010, 11:04:32 AM
omg. That's a gorgeous frontend.

Good for you!
Title: Re: Dual Mid 1084 Clone Project
Post by: mylesgm on August 24, 2010, 11:15:47 AM
very sweet...
Title: Re: Dual Mid 1084 Clone Project
Post by: bruno2000 on August 24, 2010, 11:51:30 AM
:o :o
great project and kudos for seeing this through all on your own!
at first I thought "how does he fit all the switches in" but then I saw it's not actually 500/51x format. ::)
i am not sure if you are planning to release pcb files, or indeed do a run of pcbs (I am sure interest would be there, especially as a mic pre seems to be included as well), but one thing I would really like to know is the value of the "Q resistor" that you used to achieve a 1073-like bandwidth. I believe it's R51 (7k5) in the original schematic, on the PPEQN it's R17 with a choice of 2k7 or 6k8 (or anything in between).

that's quite a lot of iron colin had to send over the atlantic!

And quite a lot of shipping money going to FedEx!!!!
In the BA211 board circuit used in the 1073 (with no "P" terminal) the resistor setting the "Q" (from the coil "starts" to terminal E) is 2k7 ohms.  In the BA211a board circuit used in the 1084 (with the P terminal), that resistor is 6k8 (6k81).  In the 1084 the resistor switched in parallel with the 6k8 resistor when you select "Hi Q" is 7k5 ohms.  What I did was change the 7k5 ohm resistor to a 4k42 so that the resulting resistance was about 2k7 (2k68) ohms.  I checked all of the curves with "real" 1073s and 1084s and they were spot on.
Hope this answers the question!!!
Best,
Bruno2000
Title: Re: Dual Mid 1084 Clone Project
Post by: ultra-alex on August 24, 2010, 04:44:34 PM
awesome!
Title: Re: Dual Mid 1084 Clone Project
Post by: baadc0de on August 24, 2010, 04:54:11 PM
Ummm... speechless! You nailed exactly what I wanted (only with an extra mid section no less). A small format 1084 with a micpre and phantom power. Wow!
Title: Re: Dual Mid 1084 Clone Project
Post by: grantlack on August 24, 2010, 05:04:00 PM
so this just happened out loud when i saw these pics... i'll do my best to translate into stylized type:

ho-leeeeeeeee sh*t.

no joke.  pardon my "french."
Title: Re: Dual Mid 1084 Clone Project
Post by: Soeren_DK on August 24, 2010, 06:19:01 PM
Waoooooouuuuuwwww

Holy macaroni

and the crowed goes: "P-C-B", "P-C-B", "P-C-B", "P-C-B", "P-C-P", "P-C-P", "P-C-P"

Cheers
Søren
Title: Re: Dual Mid 1084 Clone Project
Post by: Joechris on August 24, 2010, 06:38:42 PM
Outstanding!!
1000 of hours must have been spend on this project.
Title: Re: Dual Mid 1084 Clone Project
Post by: California Road on August 24, 2010, 06:49:57 PM
That is a serious front end!  I would love to hear these in action. 
Title: Re: Dual Mid 1084 Clone Project
Post by: deuc224 on August 24, 2010, 11:55:28 PM
Since no one has the balls to just come out and ask, i will. Are you gonna do a run for us primative people :'( look at my tears
Title: Re: Dual Mid 1084 Clone Project
Post by: darnell on August 25, 2010, 02:20:59 AM
Since no one has the balls to just come out and ask, i will. Are you gonna do a run for us primative people :'( look at my tears

Seriously, this project looks too clean to not put to the presses!!!!!

d.
Title: Re: Dual Mid 1084 Clone Project
Post by: bpucekov on August 25, 2010, 04:11:16 AM
WooooooW
Title: Re: Dual Mid 1084 Clone Project
Post by: evilcat on August 25, 2010, 05:08:11 AM
Me too ! me too ! me too !!! I want one, no, two, no, eight !!!!
Title: Re: Dual Mid 1084 Clone Project
Post by: SIXTYNINER on August 25, 2010, 05:26:02 AM
 :o  compliments !!!
really nice "porn" eq project !
 8)
Title: Re: Dual Mid 1084 Clone Project
Post by: zayance on August 25, 2010, 07:01:13 AM
Ouch.... heart my eyes  :)
Title: Re: Dual Mid 1084 Clone Project
Post by: Hank Dussen on August 25, 2010, 07:08:10 AM
If you'd decide to sell the PCB's (or kits) it'd be raining orders...
Title: Re: Dual Mid 1084 Clone Project
Post by: Grand Master Audio on August 25, 2010, 09:26:12 AM
ohh nice, unbelievably compact PCB layout!

yummy in my tummy!

 ;D
Title: Re: Dual Mid 1084 Clone Project
Post by: bruno2000 on August 25, 2010, 10:13:31 AM
Since no one has the balls to just come out and ask, i will. Are you gonna do a run for us primative people :'( look at my tears

OK, OK,  Thanks for the support!!!  I just build stuff for myself, and didn't think there would be this much interest.  If I can get some idea of how many folks want boards, and how many each person wants, I'll have another run made.  I think the board sets will be about $100 plus shipping, and I'll open a thread in the White Market if this gets rolling.
Best,
Bruno2000
Title: Re: Dual Mid 1084 Clone Project
Post by: Soeren_DK on August 25, 2010, 10:51:19 AM
Since no one has the balls to just come out and ask, i will. Are you gonna do a run for us primative people :'( look at my tears

OK, OK,  Thanks for the support!!!  I just build stuff for myself, and didn't think there would be this much interest.  If I can get some idea of how many folks want boards, and how many each person wants, I'll have another run made.  I think the board sets will be about $100 plus shipping, and I'll open a thread in the White Market if this gets rolling.
Best,
Bruno2000

Is it for 8 channels? If so that's a very good price...  :o :o ;) ;) ;)

Cheers
Søren
Title: Re: Dual Mid 1084 Clone Project
Post by: bruno2000 on August 25, 2010, 11:15:53 AM
Since no one has the balls to just come out and ask, i will. Are you gonna do a run for us primative people :'( look at my tears

OK, OK,  Thanks for the support!!!  I just build stuff for myself, and didn't think there would be this much interest.  If I can get some idea of how many folks want boards, and how many each person wants, I'll have another run made.  I think the board sets will be about $100 plus shipping, and I'll open a thread in the White Market if this gets rolling.
Best,
Bruno2000

Is it for 8 channels? If so that's a very good price...  :o :o ;) ;) ;)

Cheers
Søren

No, I'm afraid that's for one board set (1 of the main EQ/mic pre, 1 of the pots and toggle/pushbutton switches).  
Best,
Bruno2000

Title: Re: Dual Mid 1084 Clone Project
Post by: deuc224 on August 25, 2010, 10:56:17 PM
I would have to ask for some extra days at work but i would be in for 2 somehow lol. This project looks too bad ass to pass up. Dual mids are what was missing in the N series EQ.
Title: Re: Dual Mid 1084 Clone Project
Post by: Stagefright13 on August 25, 2010, 11:37:59 PM
Wow that is beyond words! Awesome! I'll trade you a nice rack to put it in LOL!

But seriously great job. And we all LOVE pictures.

GO EAST COAST!  ;D

John
Title: Re: Dual Mid 1084 Clone Project
Post by: deuc224 on August 26, 2010, 06:17:16 AM
How are they powered? i dont see the PS with the unobtainium caps :D
Title: Re: Dual Mid 1084 Clone Project
Post by: audiophreak on August 26, 2010, 08:05:27 AM
i dont see the PS with the unobtainium caps :D

  now thats just freekin funny  ;D
Title: Re: Dual Mid 1084 Clone Project
Post by: bruno2000 on August 26, 2010, 08:46:27 AM
How are they powered? i dont see the PS with the unobtainium caps :D

They are powered with some commercial (Power One) supplies I had laying around.  They are in a separate box (not shown).  There's a 24V 5A supply for the audio, a separate 24V 400 mA supply for the relays, and another 24A 400 mA supply in series with the audio supply for Phantom.  The people at Power One assured me that the all of their power supplies come stock with the unobtainium caps :D
Best,
Bruno2000
Title: Re: Dual Mid 1084 Clone Project
Post by: kazper on November 17, 2010, 10:42:18 PM
Hows this one coming along?
Title: Re: Dual Mid 1084 Clone Project
Post by: bruno2000 on April 19, 2012, 03:33:50 PM
I have some left over boards from this project.  PM me if you are interested.
Thanks!
Best,
Bruno2000
Title: Re: Dual Mid 1084 Clone Project
Post by: djn111 on April 19, 2012, 03:40:51 PM
PM'd

DJN
Title: Re: Dual Mid 1084 Clone Project
Post by: supiarmando on June 07, 2013, 06:01:03 AM
Hi Bruno,

this time I am starting one of your boards. Is it possible to get a schema for this project? I only have the BOM. Thanks
Title: Re: Dual Mid 1084 Clone Project
Post by: johnnyho72 on August 13, 2013, 01:43:57 AM
Any chance you will do another run of these boards? I'm just getting into building gear and this one tweaked my interest big time.
Title: Re: Dual Mid 1084 Clone Project
Post by: sharpeleven on September 16, 2013, 04:45:32 PM
+1
Title: Re: Dual Mid 1084 Clone Project
Post by: ruffrecords on September 16, 2013, 06:45:47 PM
Can I just check one thing. All the Grayhill switches are on the main PCB. The toggles and pots are on the daughter board. Correct? That makes a very elegant layout. Which pots and toggles do you use?

Cheers

Ian
Title: Re: Dual Mid 1084 Clone Project
Post by: prescott on November 07, 2013, 04:04:25 AM
What is the solution to use in line in mode?

Is it possible with that 9045 or have to buy 9046?
Title: Re: Dual Mid 1084 Clone Project
Post by: bruno2000 on November 07, 2013, 10:51:25 AM
What is the solution to use in line in mode?

Is it possible with that 9045 or have to buy 9046?

The new boards have positions for the 9045 AND the 9046.  An option is to increase the loss through the pad and feed a line level signal into the mic input like the 1066.
Best,
Bruno2000
Title: Re: Dual Mid 1084 Clone Project
Post by: r2d2 on October 27, 2016, 10:54:03 AM
no more "follow ups" about this nice device ?
r.
Title: Re: Dual Mid 1084 Clone Project
Post by: wmarden on January 15, 2018, 01:24:06 PM
I sent you a pm to see if this project still has legs...
Title: Re: Dual Mid 1084 Clone Project
Post by: SIXTYNINER on May 23, 2018, 10:14:32 AM
As many members of this place just know ,
unfortunately "Bruno2000" ( sadly ) is no more with us (R.i.p.)  :'(

we were in touch for another run of the 1084 dual mid project ,
unfortunately the time was not our friend ,

this post as invitation to anyone would like to contribute
with any doc (image, schematic, bom, etc.. )
and post with related build help ,
useful  to make it and complete it .

In memory of  : "Bruno2000",

very thanks in advance for any post or pm about .
Title: Re: Dual Mid 1084 Clone Project
Post by: 3nity on May 23, 2018, 10:27:31 AM
What? Did he passed away? When how come? 😔
Title: Re: Dual Mid 1084 Clone Project
Post by: SIXTYNINER on May 23, 2018, 11:46:36 AM
What? Did he passed away? When how come? 😔

Hi  ,  a so sad news
https://www.legacy.com/obituaries/atlanta/obituary.aspx?n=joseph-f-neil&pid=188613421&fhid=5288
noticed also on brewery section  .

any 1084 dual mid , doc , info , help , shared
in memory of Bruno2000 , is appreciated .
Title: Re: Dual Mid 1084 Clone Project
Post by: SubhumanRecords on May 23, 2018, 05:20:33 PM
I’m building 8 of Joes 1084’s. There about stuffed. All I have is the BOM. Going in July to his house for his Celebration of Life gathering. I’ll see if I can get anymore info when I speak to his wife.
We lost the most  important DIY’r anywhere.  Love Joe, I no your soldering somewhere better my friend. Love ya.
Myke
Title: Re: Dual Mid 1084 Clone Project
Post by: SIXTYNINER on May 23, 2018, 05:42:46 PM
I’m building 8 of Joes 1084’s. There about stuffed. All I have is the BOM. Going in July to his house for his Celebration of Life gathering. I’ll see if I can get anymore info when I speak to his wife.
We lost the most  important DIY’r anywhere.  Love Joe, I no your soldering somewhere better my friend. Love ya.
Myke
Thanks for post SubhumanRecords , !
and yes you are right  :  "We lost the most  important DIY’r anywhere ",  unfortunately .

any help about is welcome,
let us know  .

Title: Re: Dual Mid 1084 Clone Project
Post by: SubhumanRecords on May 24, 2018, 12:05:19 AM
Took pics of BOM.
Title: Re: Dual Mid 1084 Clone Project
Post by: SubhumanRecords on May 24, 2018, 12:07:35 AM
Page 2
Title: Re: Dual Mid 1084 Clone Project
Post by: SubhumanRecords on May 24, 2018, 12:08:12 AM
Page 3
Title: Re: Dual Mid 1084 Clone Project
Post by: SubhumanRecords on May 24, 2018, 12:08:45 AM
Page 4
Title: Re: Dual Mid 1084 Clone Project
Post by: SIXTYNINER on June 14, 2018, 12:15:09 PM
Many thanks for posts SubhumanRecords
this help to have Neil with us.

anybody have more docs-helps like pcb images , schematics ,
calibration info , etc… ?
more thanks

Title: Re: Dual Mid 1084 Clone Project
Post by: r2d2 on June 26, 2018, 09:51:07 AM
As many members of this place just know ,
unfortunately "Bruno2000" ( sadly ) is no more with us (R.i.p.)  :'(

we were in touch for another run of the 1084 dual mid project ,
unfortunately the time was not our friend ,

this post as invitation to anyone would like to contribute
with any doc (image, schematic, bom, etc.. )
and post with related build help ,
useful  to make it and complete it .

In memory of  : "Bruno2000",

very thanks in advance for any post or pm about .

+ 1 here interested to build some dual mid 1084
in memory of the nice guy  "Bruno2000"!

who have built the modules have some more documentation
like schematics , images of pcb and other more as help ?
thanks
Title: Re: Dual Mid 1084 Clone Project
Post by: Zander on August 07, 2018, 03:13:42 AM
Hi,

I’m building 8 units too. I have info: pdf bom, schematic and written info in my mail from Joe. (Pm me with what you need)
So the ones who have build the 1084’s where did you source the hollow shaft switch? I have the correct part no from Grayhill but the MOQ is 25 pcs. @ €45/pce...
Title: Re: Dual Mid 1084 Clone Project
Post by: Zander on August 07, 2018, 05:45:01 AM
Ok. So I've found something dubious. I have rev 5.1 and the layout in pdf of 4.9. In rev 4.9 R211 is 91R and is clearly located around C210 (400uF/4V) and connected to its negative leg. In the original BA283 schematic the value is 1K8. In my rev 5.1 the location where R211 was is now R214 but I don't have the corresponding BOM. What would you do?
*In the BOM Subhumanrecords posted above this seems corrected to R214= 91R*
Title: Re: Dual Mid 1084 Clone Project
Post by: Zander on August 14, 2018, 02:24:15 AM
I can’t find R215 & R2105 (BOM 4.9-5.1) on the schematic (5.1), layout (4.9) or the PCB (5.1). Would these be left out?
I believe R2105 is left out the sensitivity switch in the ‘off’ position, but I can’t find where R215 would have been, maybe the optional input Zobel which is now marked R216?
Title: Re: Dual Mid 1084 Clone Project
Post by: Zander on August 22, 2018, 04:58:58 AM
Is there someone here who has a finished unit of Joe which has the hollow shaft switch installed? I need the part number of that switch. It seems like I got the weong part number from Joe. My part number includes another switch already attached to it.
Title: Re: Dual Mid 1084 Clone Project
Post by: SubhumanRecords on August 22, 2018, 07:00:44 AM
This is what he help me with on the 1081, I built a couple, couldn’t find anymore.
Title: Re: Dual Mid 1084 Clone Project
Post by: r2d2 on August 26, 2018, 02:03:46 PM
This is what he help me with on the 1081, I built a couple, couldn’t find anymore.
hi "SubhumanRecords"
please could you check about the attached  ?
it say me : "404 error "
( as showed in my attached...)
let me know
cheers
Title: Re: Dual Mid 1084 Clone Project
Post by: abbey road d enfer on August 27, 2018, 04:12:48 AM
This is what he help me with on the 1081, I built a couple, couldn’t find anymore.
Please upload to GDIY instead of temporary links.
Title: Re: Dual Mid 1084 Clone Project
Post by: SubhumanRecords on August 27, 2018, 09:21:28 PM
Hollowshaft..
Title: Re: Dual Mid 1084 Clone Project
Post by: SubhumanRecords on August 27, 2018, 09:22:24 PM
Hollowshaft