Description
The Alfa AS2164 quad vca chip is a great chip for making VCFs or VCAs. You get four independent voltage controlled amplifiers(VCAs) in a single package, so per-VCA cost is very low.
Each VCA has a 100dB dynamic range and accepts attenuation control voltages from 0V (0dB) to 3.3V (-100dB). Note that this is an exponential response of -33mV/dB. Negative control voltages can give gain up to +20dB. Supply voltage is ±4V to ±18V, so this is a chip that can also be used with stompbox 9V supplies.
Download AS2164 Quad VCA datasheet
These are brand new chips fresh from the Alfa Rpar semiconductor factory in Riga, Latvia.
There is an example pole-mixing multimode filter circuit that can be built using this chip in the Multimode Filters, Part 2: Pole-mixing filters article, but the possibilities are endless!
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