Seppoman's SSM2164 PCB (work in progress…)
|C1,C2||220 uF||RAD 220/25|
|C3-C6||560 pF||KERKO 560P|
|C17-C20||470nF||Z5U-5 470N (*2)|
|IC2,IC3||TL074||TL 074 DIL|
|R1-R4, R9-R12,||27k||METALL 27,0K|
(IC sockets, pin headers, flat ribbon cable etc are omitted)
(*) There are quite a few places where you can buy the SSM2164. Feel free to add your finds to this section :)
|Shop||Order Code||Price||Date Price Checked|
|Farnell||1438744||6.33 EUR + VAT||(2010/07/14)|
|RS||427-250||6.33 EUR + VAT||(2010/07/14)|
Note that Farnell only delivers to professional customers and university members.
(*2) 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.