ssm2164 VCO is back!

[Roman Sowa]

Hi all,

If you rememmber my posts about VCO with SSM2164...
Well, it's done!
Actually it's *quad* VCO with V/oct and linear FM inputs each,
not hard, but "strong" sync in, running from 0.3 Hz to almost 40kHz
and even beyond 100kHz if you don't care for clean saw.
outputs: saw, triangle and sine (well, not exactly a sine, but I had
one spare opamp in TL074 so I made 2-zener sine shaper).
SSM2164 is not temperature stabilized or compensated in any way.
When I first pluged it in, I was shocked... Must say that integrator
caps were selected to match each other and resistors were 1%,
but I didn't expect the SSM to be so acurate.
All four VCOs were running in no more than one semitone intervals
without trimming. Then I trimmed those babies, and listen to this
beautifull sound for half an hour like dork.
Additionally each VCO can be modulated via 3 VCAs. One for FM
and two for V/oct. It gives 12 VCAs onboard :-O
why so many? my modular will be all-VC, meaning no hardwired pots,
everything set up from ugly display with 10 buttons, or 15 assignable pots.
For this I need sea of VCAs.
So far I didn't have time to tweek it like mad (don't have this 15 pot
module), so can not tell you how it matches CV through entire range.
BTW, if anyone is interested, the pcb was made in "pcb-factory"
(ordered 2 pieces) for about 8$ each, double sided, hole platted,
10X12cm.

I'm looking now for a free website. I found one which gives me
up to 2 megs space, so maybe I'll put there some pictures, schemos,
but for .wavs it wont be enough.
If you can recommend a better service, please mail me privately.
I don't know if it would matter that I live in Poland.

Roman