Adafruit PAM8904 STEMMA Piezo Driver Audio Amplifier | thingbits

Adafruit PAM8904 STEMMA Piezo Driver Audio Amplifier

Name: Adafruit PAM8904 STEMMA Piezo Driver Audio Amplifier
SKU: TH1987
Price: 589.0 INR
Availability: InStock

SKU: TH1987

₹695.02₹903.53SAVE 23%

₹589.00 (Ex. of GST)

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Piezos are simple to use, but getting them loud—or driving them at ultrasonic frequencies—usually needs more than a microcontroller pin can deliver. That’s where the Adafruit PAM8904 STEMMA Piezo Driver shines. This breakout is built around the PAM8904, a dedicated piezo driver IC designed specifically to push piezo elements far beyond standard PWM outputs.

₹695.02

₹589.00 (Ex. of GST)

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Overview

Unlike traditional audio amplifiers, the PAM8904 is optimized for piezo loads and works up to 300 kHz, making it ideal for both audible buzzers and ultrasonic distance-sensing applications. The onboard switched-capacitor boost circuit and bridge-tied load (BTL) output allow it to multiply voltage internally, delivering up to ~13V peak-to-peak from a low-voltage supply.

Using it is straightforward: power the board with 3–5 VDC, feed in a square-wave signal (20 Hz to 300 kHz), and connect your piezo to the output terminal block. A built-in dual DIP switch lets you select the gain—off, 1×, 2×, or 3×—so you can tune the output level for your application. Since the output is differential, higher gain settings dramatically increase the effective peak-to-peak voltage across the piezo.

Whether you’re building ultra-loud alerts, experimenting with ultrasonic ranging, or driving piezos at higher voltages safely, this breakout gives you a compact and reliable solution.

When powered from 5 V, do not use the 3× gain setting as the resulting voltage exceeds the chip’s rated limits. At 5 V, use 2× gain maximum (≈10 Vpp).

The 3× gain setting is safe when operating from 3.3 V, producing roughly 10 V output.

Specification

Technical details for Adafruit PAM8904 STEMMA Piezo Driver Audio Amplifier.

Specification	Details
Driver IC	PAM8904 Piezo Driver
Designed For	Piezo buzzers and piezo transducers (audible & ultrasonic)
Operating Voltage (Vin)	3 V to 5 V DC
Input Signal Type	Square wave / PWM
Input Frequency Range	20 Hz to 300 kHz
Gain Settings	Off, 1×, 2×, 3× (via onboard dual DIP switch)
Output Configuration	Bridge-Tied Load (BTL), differential output
Maximum Output Voltage	Up to ~13 Vpp (gain and supply dependent)
Recommended Gain Limits	3× gain safe at 3.3 V (~10 V output) 2× gain maximum at 5 V (~10 V output)
Voltage Boost Method	Internal switched-capacitor boost circuit
Piezo Connection	Screw terminal block
Connector Type	STEMMA JST-PH, 2.0 mm pitch
Logic Compatibility	3.3 V and 5 V logic microcontrollers
Typical Applications	Buzzers, alarms, ultrasonic distance sensing, haptics

Pinout

Pin / Connector	Label	Description
Power Pins	VIN	Power input pin. Supply between 2.3 V to 5 V DC.
Power Pins	GND	Common ground for power and logic.
I/O Pins	SIG	Signal input pin. Provide a square wave from 20 Hz to 300 kHz. Signal voltage does not need to match VIN.
	VO+	Positive differential output for the piezo element.
	VO−	Negative differential output for the piezo element.
STEMMA Connector (JST-PH 2.0 mm)	SIGNAL (White wire)	Signal input pin for square-wave or PWM control.
	VIN (Red wire)	Power input, typically 3–5 V DC.
	GND (Black wire)	Ground reference for power and signal.
Terminal Block	VO+	Positive piezo output terminal. Located near the x1 label on the PCB silk.
Terminal Block	VO−	Negative piezo output terminal. Located near the PAM8904 label on the PCB silk.
Gain Selector	DIP Switch	Dual DIP switch to set output gain: • OFF = 0× gain • x1 switch ON = 1× gain • x2 switch ON = 2× gain • x1 + x2 ON = 3× gain Note: Differential output means 2× gain results in ~4× VIN peak-to-peak across the piezo.