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Moog 901a / 901b DIY
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Peake



Joined: Jun 29, 2007
Posts: 1109
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PostPosted: Thu Feb 10, 2011 12:51 pm    Post subject: Moog 901a / 901b DIY
Subject description: Incomplete! Untested! Now slightly deodorized!
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Edit 9/2013: I've been prompted to upload what I have in its current form; note that parts values and notes can be wrong. Check the Moog Service Manual. One note on the 901a parts layout doc about two components adding to be 500R is likely supposed to be 600R.

I have still not confirmed these. The Service Manual should be used to select transistors and to calibrate them.

---

Long-promised, not completely delivered (yet). Approved by Moog Music so long as the Moog name is not used on the artwork etc.

Incomplete...Untested. I have not downloaded and confirmed correct PCB art sizing. (They should be the same size as other Moog Modular PCBs.) I have not built these and confirmed functionality. These are derived from a 901a/901b set from just before the Service Manual's version. You can substitute the parts values in the Service Manual if desired. This is why no BOM...

NOTE THAT THESE ARE FOR THE ORIGINAL +12V / -6V / -10V POWER SUPPLY. NO SUBSTITUTIONS HAVE BEEN MADE FOR FUNCTIONALITY WITH ANY OTHER VOLTAGES.

A wiring diagram is to follow, as is the 901a parts layout.

The Service Manual (easily Google'd) details the setup procedure as well as the transistor selection.

The 2N4058 low-noise transistor will shortly again be available at MCM electronics. The 2N3391a are at Mouser. The 2N3702 and 2N3707 should also be readily available. The CL-1 diode is unobtanium, but is rated as a rectifier at 100v V(rrm). All resistors are 1/2W. The 2N2646 FET is available.

It is recommended to match all resistors on the 901b up to and around the FET =to be the same on all oscillators=. The diodes and resistors in the waveform shaper should be matched as well but not across all oscillators unless you're that sort of person. It is also possible that the ceramic and electrolytic caps in the oscillator input area up to the FET should also be matched for all oscillators. Note that all timing caps must be selected for optimum octave switching, and across all oscillators (goes without saying). Polystyrene types can be substituted for the original Mullard "tropical fish" mylar type, which is possibly part of the original character/behaviour.

More to come, please to forgive the incomplete nature. All two or three persons actually interested in this sort of thing Laughing

For those interested in a more modern take:

http://minimalist.davidleith.com/DeitzModSynth4.html

Moog and Moog Music is a registered trademark of Moog Music Inc.


Moog_901a_Layout2.pdf
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901aPCBArtwork.pdf
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901b_Artwork.pdf
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901b_PartsLayout.pdf
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_________________
We are selling emotions, there are no emotions in a grid. -mwagener

"IC 741. Sometimes you don't want fidelity." -Small Bear Electronics Catalog

Last edited by Peake on Sun Sep 15, 2013 3:13 am; edited 10 times in total
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TekniK



Joined: Aug 10, 2008
Posts: 1062

PostPosted: Thu Feb 10, 2011 1:24 pm    Post subject: Reply with quote  Mark this post and the followings unread

Great ,Peake thumb up

Some of your pictures already served me well as references
and i appreciate a lot you did UL them.
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davemoog



Joined: Feb 23, 2008
Posts: 52
Location: Vancouver

PostPosted: Thu Feb 10, 2011 11:05 pm    Post subject: Reply with quote  Mark this post and the followings unread

Yup it's a great sounding oscillator. Once the octave switching capacitors are well calibrated and the quite finicky tune-up is done the 901 is very stable and tunes well with a keyboard CV between approx .5 to 4.5/5.0 volts. One needs to keep this in mind and use the fixed cv switches to maintain that input range and use the octave switching (capacitors) to change frequency ranges.

Love the pair I built. Hope that more people build them.

Dave Leith

I think I got my CA3019 matched diodes from Senso.
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Peake



Joined: Jun 29, 2007
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PostPosted: Fri Feb 11, 2011 11:28 am    Post subject: Reply with quote  Mark this post and the followings unread

Kevin Lightner posted in the MoogerForum that the timing caps are useful as an R/C circuit; you can add up to 20Meg resistors to trim the caps for better octave'ing.

I applaud you on building a pair, and encourage you to share any hints and experiences if you feel like it, please!

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"IC 741. Sometimes you don't want fidelity." -Small Bear Electronics Catalog
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TheAncientOne



Joined: Dec 26, 2006
Posts: 146
Location: United Kingdom

PostPosted: Sun Feb 20, 2011 6:48 am    Post subject: Re: Moog 901a / 901b DIY
Subject description: Incomplete! Untested! No deodorant!
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Peake wrote:

The 2N2646 FET is available.



Vital note: the 2n2646 is NOT a FET: It's a uni-junction transistor, a very different kettle of Silicon.

It's worth buying more than one, the originals had a reasonably tight spec, but last time I wanted some I was offered a plastic package, not the TO 18 package the Motorola ones came in, and I couldn't get the same frequency range I got with the metal can ones. I was using them as a VC clock generator in an old light sequencer design of mine.

there is an effect in that over a certain 'base' voltage, they will lock-up in the triggered state, so if that is happening, you'll need to trim back the current generator. I think bad spec ones may exhibit some kind of base current leakage, that limits the full range.

Hope this helps

Mike

Edit: Just found 3 metal canned 2N2626's, guess what I think I'm building....

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danlind7109



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PostPosted: Mon Feb 21, 2011 9:52 am    Post subject: Reply with quote  Mark this post and the followings unread

Hey!
I found some Photos of the 901A/B PCB on the internet, Made new PCB-layouts from that..
Worked out a layout for the discrete mixer, and built 2 of them (to the right of the oscillators)

/Dan


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danlind7109



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PostPosted: Mon Feb 21, 2011 10:09 am    Post subject: Reply with quote  Mark this post and the followings unread

Files...
descrete mixer PDF Ready for PCB...
/Dan


901a.pdf
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901b.pdf
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danlind7109



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PostPosted: Mon Feb 21, 2011 1:51 pm    Post subject: Reply with quote  Mark this post and the followings unread

Just for fun:
901B sinus-Discrete mixer-Feedback to mixer-COTK 904A
/Dan


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Peake



Joined: Jun 29, 2007
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PostPosted: Mon Feb 21, 2011 5:45 pm    Post subject: Reply with quote  Mark this post and the followings unread

Very nice! Any thoughts on using a THAT transistor array in a CP3 clone? They have one with matched NPN and PNP pairs.

And thank you Prof, I was obviously not aware of that. Good information!

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"IC 741. Sometimes you don't want fidelity." -Small Bear Electronics Catalog
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danlind7109



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PostPosted: Thu Feb 24, 2011 1:32 pm    Post subject: Reply with quote  Mark this post and the followings unread

I have made a simple match of the transistors in the mixers, And they work fine.
Do not se that its nesessery for super-matched Transistor arrays.

For you who want to build a 901a/b clone i recommend to use Transistor arrays
or atleast terminal coupling of the transistor pairs in the 901A.
And match the 901B resistors R2,R3,R4,R5,R6,R7, If you build more than one
901B
Do not make my misstakes... Wink

/Dan
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Peake



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PostPosted: Thu Feb 24, 2011 2:12 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks much!!
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"IC 741. Sometimes you don't want fidelity." -Small Bear Electronics Catalog
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danlind7109



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PostPosted: Thu Feb 24, 2011 3:36 pm    Post subject: Reply with quote  Mark this post and the followings unread

There is other UTJ-based Osillators,
one is in ARP Pro Solist

And some basic UTJ Theory

http://baec.tripod.com/DEC90/uni_tran.htm

/Dan


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adambee7



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PostPosted: Thu Feb 24, 2011 7:38 pm    Post subject: Reply with quote  Mark this post and the followings unread

You could use ca3046 transistor arrays or what about the THAT300 matched transistors. Very Happy Very Happy
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Peake



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PostPosted: Fri Feb 25, 2011 1:20 pm    Post subject: Reply with quote  Mark this post and the followings unread

adambee7 wrote:
You could use ca3046 transistor arrays or what about the THAT300 matched transistors. Very Happy Very Happy


Moog's next-generation 921 and 921b did indeed use the 3046. A few of each per module, IIRC.

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"IC 741. Sometimes you don't want fidelity." -Small Bear Electronics Catalog
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BoneyardAudio



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PostPosted: Mon Mar 14, 2011 11:07 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi Peake,

Thanks so much for posting these PCBs up, really useful to a lot of people. They've come at just the right time for me, as I'm about to embark on the epic task of building a Moog Modular.

You mentioned there were more to come - which models are you planning? I'm particularly interested in the 904A, 902, 911 and 921, are any of these on your list?
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ericcoleridge



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PostPosted: Mon Mar 14, 2011 11:30 am    Post subject: Reply with quote  Mark this post and the followings unread

Hey Peake, thanks for starting this thread--if you're taking note, I'm also very interested in these modules, and would like to see more Moog 900 projects.

I'd love to hear how people might be approaching the problems involved when considering Moog 900 modules. If more of these Moog inspired projects come up in the forum, a topic about general Moog making would be useful. I'm interested in what people are doing for a +12/-6 power supply (these are the voltages?), and how one could approximate Moog style panels.
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Peake



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PostPosted: Mon Mar 14, 2011 2:18 pm    Post subject: Reply with quote  Mark this post and the followings unread

The 901 modules have been out of production for many years, decades even, and no one is making a living selling them (not surprising considering what a hassle is involved in some sections). Mike Bucki sells orignal Moog Modules with Bob's blessing; I'm not going to present anything that would step on his toes and income. I may build things for myself, but not for public sharing.

No recent progress on these; been distracted by Buchla DIY.

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We are selling emotions, there are no emotions in a grid. -mwagener

"IC 741. Sometimes you don't want fidelity." -Small Bear Electronics Catalog
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BoneyardAudio



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PostPosted: Mon Mar 14, 2011 3:12 pm    Post subject: Reply with quote  Mark this post and the followings unread

Peake,

I don't think anyone was asking you to build modules for them. I merely assumed that as you had already shared one PCB layout, you might be willing to share more.

I for one have no interest in buying any Moog modules - I much prefer the challenge of building them myself Very Happy I'm sure there are many others out there who feel the same way.
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Peake



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PostPosted: Tue Mar 15, 2011 1:01 pm    Post subject: Reply with quote  Mark this post and the followings unread

No, I understand; I simply am not going to be the one to step on Mike Bucki's income by presenting any public DIY projects. If Mike were to give permission, I'd be happy to share what I'll eventually work upon.
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davemoog



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PostPosted: Tue Mar 15, 2011 4:50 pm    Post subject: Reply with quote  Mark this post and the followings unread

Although I did build an original Moog modular power supply many years ago with all the right parts, I decided to use 78 and 79 series regulators to bring +/- 15V down for the 901 modules (+12, -10, -6 I believe). It was just easier as I was integrating the VCOs into a panel and the rest of the panel required +/-15.

http://minimalist.davidleith.com/DeitzModSynth4.html
http://minimalist.davidleith.com/DeitzModSynth6.html



ericcoleridge wrote:
Hey Peake, thanks for starting this thread--if you're taking note, I'm also very interested in these modules, and would like to see more Moog 900 projects.

I'd love to hear how people might be approaching the problems involved when considering Moog 900 modules. If more of these Moog inspired projects come up in the forum, a topic about general Moog making would be useful. I'm interested in what people are doing for a +12/-6 power supply (these are the voltages?), and how one could approximate Moog style panels.
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Peake



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PostPosted: Wed Mar 16, 2011 11:40 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks Dave. That's very impressive work you're doing.
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"IC 741. Sometimes you don't want fidelity." -Small Bear Electronics Catalog
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danlind7109



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PostPosted: Fri Apr 01, 2011 5:51 am    Post subject: Reply with quote  Mark this post and the followings unread

This is why Im not intressed in dotcom anymore...

3 901b Vco into the discrete mixer and Cotk 904A filter

Play it Loud or not at all

Best Regards
Dan Lind


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1234



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PostPosted: Thu Aug 18, 2011 1:29 pm    Post subject: Reply with quote  Mark this post and the followings unread

Dave, I would like to attempt building this VCO, and will try using your PCB work. But the parts placing in ai file is not clear for me. Actually I do not have Illustrator to open it and rename the file as pdf to do it so I maybe missed something Confused

Thank you all here for recreating this wonderful design!
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noddyspuncture



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PostPosted: Mon Dec 12, 2011 2:28 pm    Post subject: Re: Moog 901a / 901b DIY
Subject description: Incomplete! Untested! Now slightly deodorized!
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Hi everyone,

Could anyone here please help? I am trying to construct the 901a and b that Mike so kindly did the PCB artwork on, but have run into a problem.

I saved the files a while ago now, but have had a hard drive failure and lost everything. I can retrieve the two PCB artworks and also the 901b parts layout - as found at the link below. But for the life of me I cannot find the 901a parts layout diagram anywhere. I do know it is out there somewhere as I definitely had it before...!

Would anyone here be able to please send it me if they have it?

Many thanks.
Tom

Peake wrote:
Long-promised, not completely delivered (yet). Approved by Moog Music so long as the Moog name is not used on the artwork etc. My mistake in having the name in the parts layout; that is not to be edited for use as board artwork.

http://www.flickr.com/photos/11165691@N03/with/2514194497/

Incomplete...Untested. I have not downloaded and confirmed correct PCB art sizing. I have not built these and confirmed functionality. These are derived from a 901a/901b set from just before the Service Manual's version. You can substitute the parts values in the Service Manual if desired. This is why no BOM...

NOTE THAT THESE ARE FOR THE ORIGINAL +12V / -6V / -10V POWER SUPPLY. NO SUBSTITUTIONS HAVE BEEN MADE FOR FUNCTIONALITY WITH ANY OTHER VOLTAGES.

A wiring diagram is to follow, as is the 901a parts layout.

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Tim Servo



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PostPosted: Mon Dec 12, 2011 6:33 pm    Post subject: Moog 901a / 901b DIY Reply with quote  Mark this post and the followings unread

Hey Tom,

Have you tried sending a PM to Mike Peake? I believe he's still running around on E-M here.


Tim (punctured my noddy once, hurt like heck) Servo
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