[sdiy] Russian parts and synth schematics...

[Grant Richter]

Disclaimer: Purely guess work based on looking at schematics. Use at your
own risk.

You would probably be OK with substituting 2N3904 for all NPNs, 2N3906 for
all PNPs, 2N3819 for N channel FETs.

The rest looks like CMOS, but I do not recognize the pin numbers.

The filter is a Sallen-Key design similar to the MS20, but uses a discrete
buffer for the output. The lack of input attenuation suggests the OTA is a
CA3280.

> From: mikas <mikas at turbodsl.lt>
> Date: Tue, 31 Aug 2004 15:53:14 +0300
> To: <synth-diy at dropmix.xs4all.nl>
> Subject: [sdiy] Russian parts and synth schematics...
> 
> hi everyone..
> 
> recently i obtain a diy synth schematics from russian magazine 'Radio'
> published on 1992. i'm thinking to build it, but it my be intresting to do
> with western chips. can someone tell me if there is prototipes for russian
> chips and transistors? i haven't practisised electrics for something like 10
> years, but it would be nice to do something now :)
> 
> schematichs can be found at:
> 
> http://mikas.turbodsl.lt/ru_synth_diy/
> 
> this is 5v/octave sinth and is build 'totaly for experimental use and PCB
> wasn't produced...' :) oh those russians ....
> 
> if someone needs a hellp with russian or info what's written i could hellp.
> by the way, could someone give me nice idea how to feed external CV and GATE
> in this schematics? i have already one, but ideas are welcome..