[sdiy] cloning the paia 2700/2720 - is this it?

[Steve Ridley]

> the 2720 modules used pcbs I'm pretty sure! the articles from radio 
> electronics all had I belive pcb designs you could etch and use? 

I've seen (and downoaded) the magazine articles as a pdf, so it is (or
was) available.  It includes schematics, pcb artwork and board layouts 
for the majority of the 2720 modules.  I can't remember where it came 
from, but if you can't find it, I can email it to you.  If has
modules 2720-1 to 2720-7, but not the later ones.
 
Modules available were:

2720-1  VCA
2720-2  VCO
2720-3L VCF LP
2720-3B VCF BP
2720-3H VCF HP
2720-4  Function (envelope) generator
2720-5  Control oscillator/noise
2720-6  Keyboard i/f
2720-7  PSU (& voltage source)
2720-8  Keyboard/case
2720-9  Glide mod
2720-11 Envelope follower
2720-12 Inverter/buffer
2720-14 Sine converter

There were also some mods published in Polyphony magazine,
and I vaguely recollect something for combining envelopes
into more complex ones.

> do you know if the 4700 sequencer is just a 4017? 

No, it's a ring counter design.  Much more interesting.

http://www.synthdiy.com/show/showproduct.asp?show=1073


Steve