[sdiy] MG-1 Mods (patching it out)

[mmanard at columbus.rr.com]

Does this mean it will go to -.1v or will it go to 0v - I'm at work so 
I can't test till I get home though I imagine -.1v will be acceptable.

Is there a non-quick and dirty way? I'm using this as a learning tool 
and want to understand more how this all works. Still a newb.

- Michael nil-x

----- Original Message -----
From: phillip m gallo <philgallo at attglobal.net>
Date: Friday, July 1, 2005 1:56 pm
Subject: RE: RE: [sdiy] MG-1 Mods (patching it out)

> Michael,
> 
> A diode has a .6V forward drop so any positive signal fed into the 
> anodeemerges on the cathode minus .6V.   So if you "tapped off" of 
> U13-B #7 and
> fed it thru a 1N4148 or 1N914 (and assumably a Pot to control 
> "depth" of
> AD(R)) to VCO 2 you would find that the output of the envelope 
> being fed to
> the VCO was always .6V less than what you read at pin #7.
> 
> regards,
> p
> 
> 
> -----Original Message-----
> From: owner-synth-diy at dropmix.xs4all.nl
> [mailto:owner-synth-diy at dropmix.xs4all.nl]On Behalf Of
> mmanard at columbus.rr.com
> Sent: Friday, July 01, 2005 10:46 AM
> To: philgallo at attglobal.net
> Cc: synth-diy at dropmix.xs4all.nl
> Subject: Re: RE: [sdiy] MG-1 Mods (patching it out)
> 
> 
> I'm not sure what you mean. A diode off pin 7? Will that remove
> the .5v? Will it affect the output of the EG in other ways?
> 
> - Michael nil-x
> 
> ----- Original Message -----
> From: phillip m gallo <philgallo at attglobal.net>
> Date: Friday, July 1, 2005 1:35 pm
> Subject: RE: [sdiy] MG-1 Mods (patching it out)
> 
> > One quick a dirty way is a series diode.
> >
> > regards,
> > p
> >
> >
> > -----Original Message-----
> > From: owner-synth-diy at dropmix.xs4all.nl
> > [mailto:owner-synth-diy at dropmix.xs4all.nl]On Behalf Of
> > mmanard at columbus.rr.com
> > Sent: Friday, July 01, 2005 4:38 AM
> > To: synth-diy at dropmix.xs4all.nl
> > Subject: [sdiy] MG-1 Mods (patching it out)
> >
> >
> > I have a second Moog Mg-1 and the keys and sliders are all but
> > destroyed, but otherwise it works. I'm going to put it behind a new
> > panel/case and mod as much as I can think of possibly patching 
> it out.
> > I'm thinking of adding an ADSR and an Analog Noise (white/pink/low
> > freq) from the asr-1 schem.
> >
> > Anyways to my question:
> > I still want to use the AD(R) generator onboard too but I've 
> found a
> > small issue. The output on the EG is never 0v - it is always 
> about .5v
> > which is fine for most mod routings but I wanted to route it to the
> > OSC2 freq which makes it slightly go sharp. Any ideas how to correct
> > this?
> >
> > I'm getting the EG output from Pin 6/7 of U13.
> >
> > Here's the schematic:
> > http://www.geocities.com/gallomagnetix/mg1_control.jpg
> > --
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