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A 5-channel mixer / preamplifier for piezo disks by godfried-willem raes
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piezo preamp schematic - Schema Digital
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PIEZOELECTRIC_BUFFER - Amplifier_Circuit - Circuit Diagram - SeekIC.com
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Altoids piezo pre-amp – Stompville
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piezo preamp schematic - Schema Digital
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The Guitar Wiring Blog - diagrams and tips: Multipurpose Guitar Preamp
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PiezoPreamp - XPUB & Lens-Based wiki