Description
The AS3320 is a high performance voltage-controlled four-pole filter modelled after the CEM3320, with on-chip voltage-controllable resonance. The chip can be configured as an lowpass, highpass, bandpass, or all pass filter. It has an exponential (V/Oct) frequency control input which can cover more than ten octaves with little control voltage feedthrough. The Resonance CV allows control of the resonance from zero to low distortion oscillation. For more demanding applications, further trimming can improve control voltage rejection. Each filter section is fully temperature compensated and has consequent low warm-up drift.
This chip can be used to build any filter circuit based on the CEM3320 VCF chip. The 3320 was used in classic instruments like the Sequential Prophet 5 and Pro-One mono synth, the Elka Synthex, the PPG Wave 2, and even in the Fairlight CMI and the LinnDrum!
On this site, we have many CEM3320 filter designs from classic synths, or various multimode filter designs using the chip.
Download AS3320 voltage-controlled filter datasheet
These are brand new chips fresh from the Alfa Rpar semiconductor factory in Riga, Latvia.
Adam (verified owner) –
Great sounding filter! There’s a few very nice configuration options provided in the documentation linked to this page. I chose the standard “data sheet” setup. I didn’t change any values other than I’m juicing with +-12 eurorack power. Everything was fully soldered and functional in about 2 hours. Nice sounding response curve, can squeal, scream and nicely sing. Will soon be buying more.