[sdiy] Anyone recognize this schematic? It's a transistor ladder with PNPs...

[Harry Bissell]

CFR was a company that did some modules aimed at the (I suppose) synth-diy market of the mid to late 70's.
I think they were in Massachusetts (Neuton, MA ?).  They advertised in some electronic mags of that time. probably
Popular Electronics. Might be something in Electronotes as well.

The filter looks like the method used by Musonics in the "Sonic 6" marketed by Moog. Its a ladder that you load from the
top instead of the bottom...

Don't know why Google-fu is failing... this stuff 'used' to be there, I've seen it as well...


H^) harry


----- Original Message -----
From: lanterma at ece.gatech.edu
To: synth-diy at dropmix.xs4all.nl
Sent: Wed, 30 Mar 2011 03:18:18 -0400 (EDT)
Subject: [sdiy] Anyone recognize this schematic? It's a transistor ladder with PNPs...

I found this interesting schematic while I was sorting through files - but I can't remember where I got it from, and my google fu has failed me!

http://users.ece.gatech.edu/~lanterma/ems11/CFR_ladder.gif

Did one of y'all draw this?

Anyone recognize the handwriting?

Or the particular circuit?

Almost every Moog transistor ladder VCF uses NPNs, but this one (whatever it is) uses PNPs.

- Aaron
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-- 
Harry Bissell & Nora Abdullah 4eva