[sdiy] DIY Polysynths

[GEORGE HEARN]

Guys, I think we all need to get away from using CEM's.  With modern SMT there is really no excuse for it in DIY projects anymore.  Think of all those prophets, jupiters, memorymoogs etc. that will die because a bunch of CEMs are rotting on some breadboard in a half finished project in a  shed somewhere!
  I put my hands up and admit to using a few myself, and I put an SSM2040 in upside down once too.. though i've made a lot of effor to circumvent the need for 'em..

Finally I've started putting some stuff on the web at www.hearnmorley.com

George


--- On Tue, 28/7/09, Florian Anwander <fanwander at mnet-online.de> wrote:

> From: Florian Anwander <fanwander at mnet-online.de>
> Subject: Re: [sdiy] DIY Polysynths
> To: "synthdiy" <synth-diy at dropmix.xs4all.nl>
> Date: Tuesday, 28 July, 2009, 12:08 PM
> Hello Tom
> 
> > these below. Can anyone add anyone else to this list?
> It is not yet publishable, but sometimes I am continuing to
> work on a
> four voice expansion for my Korg Monopoly.
> 
> Also it won't be completely diy, because I will start with
> a readymade
> CEM-based prototype of a Doepfer A-135-2 (a not yet
> released product
> http://www.doepfer.de/a1352.htm).
> The idea is to pick the CV, Gate and  VCO-Signal from
> the Monopoly and
> to handle it outside in a additional four voices. Each
> voice will
> consist of one VCO (CEM3340), VCF, VCA (CEM3372) and two
> Tom-Wiltshire-envelopes. No additional LFO at the moment.
> The most complex and time consuming task shall be the
> control panel,
> which will provide access to the four individual voices in
> three
> different modes:
> 1.) one set of controls determines the sound of all four
> voices
> 3.) each voice is controlled by its own set of
> potentiometers/switches
> 2.) one set of controls determines the sound of all four
> voices, but the
> other potentiometer sets should provide offsets from these
> master values.
> 
> Until now exists the breakout from the Monopoly, one voice
> on a soldered
> breadboard with the VCO and two of your envelopes (plus the
> existing
> VCF/VCA module). It basically works, but now I am lacking
> much time to
> complete it (and also there are always those small (and
> bigger)
> modification ideas and repair jobs, that crop up every now
> and then.
> 
> Florian
> 
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