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...
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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 board carries a small or fine-pitched component and brings its connections out to standard, breadboard- and header-friendly pins. Describing a part as a breakout means it can be wired into a project without soldering directly to the component's tiny contacts.
- DC
- DC means direct current, where electricity flows in one constant direction, as supplied by batteries, USB ports and many plug-pack power supplies. When a product specifies DC, it runs from a DC supply rather than mains AC, so you need to provide the correct voltage and polarity.
- 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 single chip that runs a stored program and controls connected inputs and outputs such as buttons, sensors, displays and communication interfaces. In a device built around one, it is the part that executes the code and coordinates the device's behaviour.
- 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 terminal block is a connector that joins wires together in a neat, removable, or serviceable way, usually clamping each wire under a screw or spring instead of soldering. It makes it easier to connect, change, or service wiring without permanent joints.
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