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 Forum index » DIY Hardware and Software
Moog modular ring modulator w/ transformers?
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rjd2



Joined: Sep 02, 2007
Posts: 235
Location: philly

PostPosted: Fri Dec 14, 2012 12:46 pm    Post subject: Moog modular ring modulator w/ transformers? Reply with quote  Mark this post and the followings unread

hey folks, i stumbled across this ebay auction:

http://www.ebay.com/itm/Vintage-Ring-Modulator-Unit-for-Moog-Modular-System-Analog-Synthesizer-Rare-/170957157600?pt=Keyboards_MIDI&hash=item27cdd734e0

and realized that it uses UTC A-20 transformers. i actually have four of these lying around doing nothing at the moment. did some googling, and i cant find much info on this original module; im thinking if i could find the schems, maybe i could duplicate it? looks like mostly diodes and transformers. anyone have any info on this by chance? thanks, rj
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JingleJoe



Joined: Nov 10, 2011
Posts: 878
Location: Lancashire, England
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PostPosted: Fri Dec 14, 2012 1:42 pm    Post subject: Reply with quote  Mark this post and the followings unread

9 out of 10 of the "proper" ringmods I've seen are this circuit
http://petemoss.org/bending/ringmod.jpg
That's probably what you've got there Smile

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As a mad scientist I am ruled by the dictum of science: "I could be wrong about this but lets find out"


Green Dungeon Alchemist Laboratories
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rjd2



Joined: Sep 02, 2007
Posts: 235
Location: philly

PostPosted: Fri Dec 14, 2012 2:04 pm    Post subject: Reply with quote  Mark this post and the followings unread

thanks!
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JingleJoe



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PostPosted: Fri Dec 14, 2012 2:29 pm    Post subject: Reply with quote  Mark this post and the followings unread

I prefer this kind of circuit layout though
http://www.3amnoise.net/ringmod.jpg
I like it when the diodes in a full wave rectifier form a diamond shape Laughing

note: just noticed they have different inputs and outputs ... I want to get an oscilloscope on that and see what the difference is!

_________________
As a mad scientist I am ruled by the dictum of science: "I could be wrong about this but lets find out"


Green Dungeon Alchemist Laboratories
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analog_backlash



Joined: Sep 04, 2012
Posts: 391
Location: Aldershot, UK
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PostPosted: Fri Dec 14, 2012 4:10 pm    Post subject: Reply with quote  Mark this post and the followings unread

That last diagram looks suspiciously like Ken Stone's diagram Wink

http://www.cgs.synth.net/modules/cgsrr.html

Finally got link to work properly. Having trouble doing things in Google Chrome!!!

I'm only bothering to say this as Ken gives a bit more info on the circuit here, such as using Ge diodes (or Schottkys) and the need to match them.

Gary

ADDITIONAL: See the e-m thread:

http://electro-music.com/forum/topic-28218.html&postorder=asc

Which covers the CGSRR and other transformer/diode type ring mods.
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