Adafruit
Adafruit STEMMA Piezo Driver Amp - PAM8904
The Adafruit STEMMA Piezo Driver Amp uses the PAM8904 switched-capacitor driver to amplify signals for piezo elements at up to 300 kHz. With bridge-tied load...
The Adafruit STEMMA Piezo Driver Amp uses the PAM8904 switched-capacitor driver to amplify signals for piezo elements at up to 300 kHz. With bridge-tied load (BTL) output and up to 3× voltage multiplication, it can deliver approximately 13 Vpp — much louder than driving a piezo directly from a 3V microcontroller.
The STEMMA JST-PH connector makes wiring simple: provide 3–5V DC power and a square wave signal (20 Hz to 300 kHz), connect your piezo to the terminal block, and set the gain with the onboard dual DIP switch.
Key Features
- PAM8904 Piezo Driver – Switched-cap BTL driver with built-in voltage boosting
- Frequency Range – 20 Hz to 300 kHz (suitable for audio and ultrasonic applications)
- Selectable Gain – Off, 1×, 2×, or 3× via dual DIP switch
- Up to ~13 Vpp Output – At 3× gain with differential BTL output
- 3–5V DC Input – STEMMA JST-PH connector for plug-and-play wiring
- Terminal Block Output – Easy connection to piezo elements
Ideal For
- Loud piezo buzzer and alert systems
- Ultrasonic distance sensing
- Audio tone generation
- Any project needing high-voltage piezo drive
Package Contents
- 1× STEMMA Piezo Driver Amp breakout (PAM8904)
Jargon buster
Plain-language definitions for the technical terms used above.
- breakout
- A breakout is a small circuit board that makes a tiny or hard-to-solder component easier to connect to with standard pins. It matters because this OLED module can be wired into a microcontroller project without needing to solder directly to the display’s fine contacts.
- DIP switch
- A DIP switch is a small set of physical on/off switches used to configure hardware settings without software. It matters because changing features such as auto power-on or charging limits may require moving these tiny switches correctly.
- microcontroller
- A microcontroller is a small computer on a chip that runs your program and controls connected inputs and outputs. For this product, it is the part that reads buttons and sensors, drives the display and speaker, and communicates over Bluetooth.
- pH
- A measure of how acidic or alkaline a liquid is, on a scale where 7 is neutral. For a water monitoring kit, pH tells you about water chemistry and whether the included probe matches the range and accuracy your project needs.
- STEMMA
- A plug-and-cable connection system used on some maker electronics boards to make wiring simpler. If a product uses STEMMA, you need the matching cable or connector type to plug it in without soldering.
- Terminal block
- A connector used to join wires together in a neat, removable, or serviceable way. For this product, it helps split one power input into several outputs without soldering.
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Audio & Video
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Related Tutorials
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