Request: Variable bandpass filter

This is based on R. G. Keen’s LoFi telephone noise maker/emulator modified as a variable bandpass filter with the noise component removed (a mod suggested by M. Hammer). I updated the original schematic (by Keen) with the mods.

And I did a quick vero layout as well. I’ve already built this and it works, so this is verified.

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4 thoughts on “Request: Variable bandpass filter

  1. I wouldn’t know about the best place, as there are many different options, some more elaborate than others. The easiest way would probably be to replace R15 with a potentiometer and take the output signal from the wiper/center lug. 1M pot would be a direct replacement, but a 100k probably work well too.

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