This is the Electronotes Bi-N-Tic filter. It's a very odd kind of filter. My original design for it used a 555 timer for the clock, but I found that Ken Stone's design that uses an Electronotes/ASM1 VCO for the clock gives a lot more functionality, so I included that (and only that part from his design) in this PCB.

Unfortunately, I forgot to move all the part values to the proper layer and my PCB house excluded them (as you can see in the picture). When building it you'll have to refer to the included board printout.

This design has one somewhat rare CA3240 in it, which will be included with your order of a PCB.

Click here for samples.

Click here for schematics, BOM and docs.

If you have any questions at all please let me know.