[sdiy] Synthacon filter notes...

[Mike Brown]

Well, I've just successfully completed my synthacon filter (based on Ken's version of the Steiner circuit).  

I had a little trouble with it, but the main problem was I had the PN2222s in backwards (doh!)  Of course, this was because I pulled up the datasheet for the 2N2222, which has the reverse pinout.  

I used a 1.5k pot for the resonance control, partly because I didn't have a 1k, but also, I wanted to go with a slightly higher value, so I could push it way past oscillation.  A 2k would probably work well also.

But, I *must* say... what a VCF!  so raspy & gritty... it's fantastic!

I have decided to include this as the 2nd VCF in my suitcase synth project.  It should make a perfect compliment to the Moog style transistor ladder filter.

regards,
Mike
mike at electronium.com

Suitcase synth project:
http://home.attbi.com/~michaeltbrown1/e_sdiy.html


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