2nd-order Voltage-Controlled Filter

Works ok. The exponential voltage tracking is rather bad, even at constant temps. However, I was really happy with how that stop-mask response plot came out, even if it is woefully inaccurate.

 

Also, the ceramic caps in the signal path (2x 100pF) are a BAD IDEA -- they sound like shit, frankly. Can't say I'm surprised, really. I only used ceramics because I forgot to buy proper 100pF film caps. The next build of this board I'll be using Poly-film caps, prolly WIMAs.

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Taken on March 5, 2012