operational amplifier - What is a good circuit for recording a piezo contact microphone or an electric guitar pickup? - Electrical Engineering Stack Exchange
Collin's Lab: DIY Contact Mic - Make:
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Guitar Contact Microphone Preamp : 7 Steps - Instructables
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Piezo Preamps
Guitar Contact Microphone Preamp : 7 Steps - Instructables
A 5-channel mixer / preamplifier for piezo disks by Godfried-Willem Raes
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Looking for piezo mic amplifier circuit - DIY STUFF - Look Mum No Computer Thingies
