Examples

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Piezo Pre-amp

We replaced the MPF102 with a J113 JFET
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Example01schematic.gif
Source: https://makezine.com/2011/12/20/collins-lab-diy-contact-mic/

LM386 amplifier

With Bass Boost!
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Example02schematic.png
Source: LM386 Datasheet

Touch sensor

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Example03schematic.gif