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Piezo Preamp Circuit Diagrams — Examples & Generator

Piezo pickups produce a high-impedance, low-level signal that needs careful buffering and amplification. These piezo preamp circuit diagrams cover common use cases—contact microphones, balanced-line drivers, and instrument preamps—showing you how to get clean, quiet gain from a piezo element. Browse the examples below, then use the interactive circuit builder to create your own custom piezo preamp circuit.

Standard IEEE Std 315 / ANSI Y32.2Engine schematex-circuitExport SVG · PNG · PDF
3 templates
Circuit diagram Piezo Preamp Circuit Diagrams —
Piezo Preamp for Acoustic GuitarPiezo Preamp for Acoustic GuitarPiezo Preamp Circuit Diagrams —Use template →Low-Noise Piezo Preamp with Balanced OutputLow-Noise Piezo Preamp with Balanced OutputPiezo Preamp Circuit Diagrams —Use template →Piezo Contact Microphone PreampPiezo Contact Microphone PreampPiezo Preamp Circuit Diagrams —Use template →

Nothing close enough? Start from a blank circuit diagram → Describe it in one paragraph.

How to

How to use a circuit diagram template.

  1. 01Choose your preamp topology

    Start by adding a JFET input buffer or a low-noise op-amp (like NE5534) as the first stage in the editor.

  2. 02Set input impedance

    Add a large resistor (1M–10M) from input to ground to bias the piezo element and avoid low-frequency roll-off.

  3. 03Design the gain stage

    Configure an inverting or non-inverting op-amp stage with appropriate gain resistors (e.g., 10k and 100k for a gain of 10).

  4. 04Add power and filtering

    Place decoupling capacitors (100nF + 10µF) near the op-amp power pins, and add a low-pass filter to remove RF interference.

  5. 05Label and export

    Annotate all component values and export your schematic as a clean PNG or SVG ready to share or build from.

FAQ

Questions about circuit diagram templates

What is the output impedance of a piezo pickup?

A typical piezo element has an output impedance of hundreds of kilo-ohms to mega-ohms at low frequencies. This requires an input buffer with at least 1MΩ input impedance to avoid loading the signal and losing bass.

Do I need a balanced output for my piezo preamp?

If you're running a cable longer than 3–5 meters, a balanced output helps reject hum and interference. Many DIY preamps add a DRV134 or THAT 1646 balanced line driver after the gain stage.

What gain do I need for a piezo contact microphone?

A typical piezo disc into a line-level input needs about 20–40dB of gain. For a mic-level input, less gain is needed. Adjust the feedback resistor in your op-amp stage to set the gain.

How do I reduce noise in a piezo preamp circuit?

Use a low-noise op-amp (like NE5532 or TL072), shield the input wiring, keep the high-impedance node small, and use a metal enclosure. Also, add a low-pass filter to remove ultrasonic noise.

Can I power a piezo preamp from a 9V battery?

Yes, many simple piezo preamps run from a single 9V battery. You'll need to bias the op-amp at half the supply voltage (e.g., with a voltage divider) and use a coupling capacitor at the input/output.