[sdiy] Polymoog

[Florian Anwander]

Hi Gene 

> The thing is massively complicated, but conquerable. It's probably the most
> complicated purely-analog programmable machine ever marketed - anybody have
> another candidate?
Yamaha CS-60/80 is not bad.

> Of all the parts the only ones I stole from the other dead polymoog were the
> divider chips. These are going to be hard to find at a good price. I found
> some for $15 each, but if I spend that much I might as well spend a little
> more and buy a used D-50 which is certainly a more capable instrument. But
> where's the fun in that?

Mine lies down with one broken top octave generator:
> 2 50240 top octave generators
I don't remember whether these are the original parts. Is there any TOG chip
available nowadays?


> The trick I've found is to combine the multiple outputs - 
Yes that is great! When I found that after vying my Poly, I used this trick for
many modifications on similar instruments back in the eighties.

> Since all of the preset parameters are determined by hand-soldered resistor
> networks, it would be concievable to alter the presets to something other
> than bad imitations of other instruments. This would affect the vintage
> resale value, but these things are far from mint anyway so I might consider
> this someday...
I started already in my Polymoog to create a CV-Input for each parametervalue
resistor. Some parameters can be voltage controlled easily, some assumingly need
more attention.
If you experiment with this be very careful. The 4007 like to die like flies.

On the voicecards I added also a resistor, that crossmodulates the saw osc to
the pulse width of the other osc. This makes this beast sounding like hell, try
it with a few cards and you will do it with all of them. I want to change this
one day to a simple tranny vca.
But this all needs still the tog :(


Btw: did you have troubles with the seating of the voice cards?

Florian
-- 
Florian Anwander                  |ConSol*  HP-Support
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