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fons posted a topic in Papilio WingsNote: this is crossposted from stackexchage , I hope this doesn't go against the forum netiquette (feel free to erase it otherwise) Background Similarly to what Jeri Ellsworth did in her C64 Bass Guitar hack I am working on an audio-to-midi converter for my bass guitar. I am also planning to use piezo discs as sensors placed under each string, connected to a Papilio One, using the ADC of the Logic Start MegaWing (an ADC128S102). The ADC reference voltage is hardwired to 3.3. volts. My problem is that my analog electronics knowledge is pretty bad and I don't have any practical experience (I have given a try to the relevant chapter of the The Data Conversion Handbook but it's a bit too advanced for me). Question What circuit should I use to drive the ADC? The circuit should Implement an anti-aliasing filter. The frequency ranges (excluding harmonics) typically found in each string of a 4-string bass are: E string: E1 (41.20 Hz) to E3 (164.81 Hz) A string: A1 (55.00 Hz) to A3 (220.00 Hz) D string: D2 (73.42 Hz) to D4 (293.66 Hz) G string: G2 (98.00 Hz) to G4 (392.00 Hz) Ensure that the input signal voltage matches the expected range of the ADC (0V to 3.3V as I understand it).I would appreciate as much practical information as possible (e.g. specific circuits and specific parts to use) since, as I have said, I am pretty unexperienced on this. Pointers to books/articles suitable for a newbie like me would also be appreciated.