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noddyspuncture
Joined: Dec 12, 2011 Posts: 2 Location: UK
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Posted: Tue Dec 13, 2011 8:00 am Post subject:
Re: Moog 901a / 901b DIY |
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Thanks Tim, already did that. It was he who suggested I post here...!
I think I have found a work around... looking at the actual Modular pcb layout I think I can suss it.
Cheerz anyway.
Tom
Tim Servo wrote: | 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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3nity

Joined: Oct 10, 2008 Posts: 13 Location: west
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Posted: Sun Dec 18, 2011 11:07 am Post subject:
Re: Moog 901a / 901b DIY Subject description: Incomplete! Untested! Now slightly deodorized! |
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noddyspuncture wrote: | ...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
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I'm in the same boat. Where's the 901a component placement file?
Anyone can help.
I'm embarking myself in building these modules.
Any help really appreciated!
Thanks |
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ericcoleridge

Joined: Jan 16, 2007 Posts: 889 Location: NYC
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Posted: Sat Dec 24, 2011 12:37 am Post subject:
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I remember seeing a Moog Modular Service Manual that included schematics and PCBs with parts overlays. I tried to find it again recently and I couldn't. But I'm sure it must be somewhere on the web still. If you just search for every moog 900 service manual scan and look through them I think you'd find it. |
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living sounds
Joined: Mar 27, 2009 Posts: 9 Location: Germany
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Posted: Sat Feb 04, 2012 1:25 pm Post subject:
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Wow, the example is pretty much the best sound I've ever heard in terms of synth bass!
Could someone please point me to the schematics/component layout for the discrete mixer?
And yes, the component placement for the VCOs would be great. |
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dingebre

Joined: Aug 10, 2008 Posts: 270 Location: Salt Lake City, UT USA
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Posted: Tue Mar 19, 2013 11:24 am Post subject:
Re: Moog 901a / 901b DIY Subject description: Incomplete! Untested! Now slightly deodorized! |
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Peake wrote: | deleted...
The CL-1 diode is unobtanium, but is rated as a rectifier at 100v V(rrm).
Moog and Moog Music is a registered trademark of Moog Music Inc. |
Very odd, but SearsPartsDirect has the CL-1 Diode available here:
http://www.searspartsdirect.com/partsdirect/part-number/871999127/0057/528
Part number 871999127
In stock. $4.80 a pop, but seems to be the real deal. I just ordered a few and will report back when they come. _________________ David M. Ingebretsen, M.S., M.E.
Collision Forensics & Enginering, Inc.
dingebre@3dphysics.net
http://www.xmission.com/~dingebre/Synthasystem.html |
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dingebre

Joined: Aug 10, 2008 Posts: 270 Location: Salt Lake City, UT USA
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Posted: Sat Mar 30, 2013 12:02 am Post subject:
Re: Moog 901a / 901b DIY Subject description: Incomplete! Untested! Now slightly deodorized! |
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dingebre wrote: | Peake wrote: | deleted...
The CL-1 diode is unobtanium, but is rated as a rectifier at 100v V(rrm).
Moog and Moog Music is a registered trademark of Moog Music Inc. |
Very odd, but SearsPartsDirect has the CL-1 Diode available here:
http://www.searspartsdirect.com/partsdirect/part-number/871999127/0057/528
Part number 871999127
In stock. $4.80 a pop, but seems to be the real deal. I just ordered a few and will report back when they come. |
Quick update for anyone who cares, Sears has emailed me the parts are "back ordered" and expect to ship April 29.
Kinda figured... Oh well, worth a try.
Should they miraculously appear, I'll be sure to update. _________________ David M. Ingebretsen, M.S., M.E.
Collision Forensics & Enginering, Inc.
dingebre@3dphysics.net
http://www.xmission.com/~dingebre/Synthasystem.html |
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dingebre

Joined: Aug 10, 2008 Posts: 270 Location: Salt Lake City, UT USA
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Posted: Mon Apr 15, 2013 10:58 am Post subject:
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I just got a note from the Sears order department, my order of the 871999127 - Diode CL-1 has SHIPPED!
Wow. I wonder if they have any other bizarre parts...
I'll post some photos when they arrive.
David _________________ David M. Ingebretsen, M.S., M.E.
Collision Forensics & Enginering, Inc.
dingebre@3dphysics.net
http://www.xmission.com/~dingebre/Synthasystem.html |
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dingebre

Joined: Aug 10, 2008 Posts: 270 Location: Salt Lake City, UT USA
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Posted: Fri Apr 19, 2013 6:30 pm Post subject:
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dingebre wrote: | I just got a note from the Sears order department, my order of the 871999127 - Diode CL-1 has SHIPPED!
Wow. I wonder if they have any other bizarre parts...
I'll post some photos when they arrive.
David |
CRAP!
They came, but they are a surface mount LED...
Worth a try I guess. Not returnable or refundable. Anyone need some very, very small SMD LEDs?  _________________ David M. Ingebretsen, M.S., M.E.
Collision Forensics & Enginering, Inc.
dingebre@3dphysics.net
http://www.xmission.com/~dingebre/Synthasystem.html |
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Peake

Joined: Jun 29, 2007 Posts: 1113 Location: Loss Angeles
Audio files: 3
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Posted: Sun Sep 15, 2013 3:16 am Post subject:
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Little kick for interest and experimenters. Note: Still unconfirmed. Use the Moog Modular Service Manual for reference and to answer any parts values/layout questions. This version is slightly different than the version in the Service Manual. _________________ 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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Peppy
Joined: Feb 10, 2021 Posts: 30 Location: heide
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Posted: Thu Dec 15, 2022 5:00 am Post subject:
901B more Information ! |
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Peake wrote: | Little kick for interest and experimenters. Note: Still unconfirmed. Use the Moog Modular Service Manual for reference and to answer any parts values/layout questions. This version is slightly different than the version in the Service Manual. |
Many thanks to "Peake" who published the layout in 2007!
I checked the layout with the schematic and built it, everything works, great VCO!
I added some information to the layout !
Description: |
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This image has been reduced to fit the page. Click on it to enlarge. |

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114 Time(s) |
This image has been reduced to fit the page. Click on it to enlarge. |

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Last edited by Peppy on Sun Dec 18, 2022 12:52 pm; edited 1 time in total |
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Peppy
Joined: Feb 10, 2021 Posts: 30 Location: heide
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blue hell
Site Admin

Joined: Apr 03, 2004 Posts: 24423 Location: The Netherlands, Enschede
Audio files: 297
G2 patch files: 320
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Posted: Sun Dec 18, 2022 11:42 am Post subject:
Re: 901B more Information ! |
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Peppy wrote: | Unfortunately, I don't know how I can delete the picture with the wrong wiring! |
Click on the 'edit' button above the post with the wrong image, scroll down a bit and click on 'posted attachments'.
From there you should see the wwww2 image and should be able to delete it.
If that is not working I can delete it for you :) _________________ Jan
also .. could someone please turn down the thermostat a bit.
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Peppy
Joined: Feb 10, 2021 Posts: 30 Location: heide
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Posted: Mon Dec 26, 2022 2:07 pm Post subject:
901a |
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What I would like to mention is an experience! Many have problems scaling the VCO to more than 2 or 3 octaves, me too! I've tried many things and often managed to give the vco good tracking on 3 octaves, over 4 octaves was hardly / not at all possible for me!
I reduced my R18 (3.3M) to 491K resistance, then it worked VERY WELL to scale the VCO to 5 octaves. VERY IMPORTANT: Let the VCO warm up for 60 minutes and no less and then start to get the octave tracking right!
Due to the reduction of R18 (901A) from 3.3M to 491K, I have not experienced any other negative effects!
PWM note: Here R29 should be changed from 13K to for example 24K, I kept this resistor with 13K and the PWM still works well!
PWM is an incredible gain for the VCO ! |
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