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Seppoman's SSM2164 PCB (work in progress...) ==== Parts List ==== |Part |Value |Reichelt No. | | | | | |C1,C2 |220 uF |RAD 220/25 | |C3-C6 |560 pF |KERKO 560P | |C7-C12 |100nF |Z5U-2,5 100N | |C13-16 |100pF |NPO-2,5 100P | |C17-C20 |470nF |Z5U-5 470N | |IC1 |SSM2164PZ |(*) | |IC2,IC3 |TL074 |TL 074 DIL | |P1-P4 |10k |64W-10K | |R1-R4, R9-R12, |27k |METALL 27,0K | |R17-R24 |27k | | |R5-R8 |470 |METALL 470 | |R13-R16 |5.6k |METALL 5,60K | (IC sockets, pin headers, flat ribbon cable etc are omitted) === Where to get the SSM2164 === (*) There are quite a few places where you can buy the SSM2164, e.g. Farnell or Digikey usually have them on stock. Feel free to add your finds to this section :) === Value of C17..C20 === These capacitors are part of a low pass filter that smoothes out noise/DAC steps etc from the CV input signal. There's a tradeoff between best cancellation of any zipper/background noise and a very snappy VCA on the other side. The value of 470nF stated in the parts list above is more on the "Silence" side of things. If you prefer a faster response of the VCA in return for some noise in certain situations, you can try lower values in this place. e.g. 220nF is a usable compromise, but you can go lower to 100nF, 10nF or even leave out the capacitor altogether. I suggest you might try out what suits you best with one single channel before stuffing all four caps.
