Combine a mono-phonic amplifier board kit, a piezo electric disk, and a potentiometer to make a custom amplifier with a contact pickup. Amplify the sound from a homemade musical instrument or listen to faint sounds from any vibrating object.
Estimated time to complete is three hours for a beginner, and two hours for someone experienced in electrical wiring, soldering and hand construction.
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Download the Amplifier with Piezo Pickup Curriculum.