Adafruit Mono Class D Audio Amplifier 2.5W PAM8302
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Adafruit Mono Class D Audio Amplifier 2.5W PAM8302, Adafruit Mono Class D Audio Amplifier 2.5W PAM8302 This super small mono amplifier is surprisingly powerful capable of delivering up to 2.5 Watts into 4-8 ohm impedance speakers. Inside the miniature chip is a class D controller, able to run from 2.0V-5.5VDC. Since the amp is a class D, it's very efficient (over 90% efficient when driving an 8 speaker at over half a Watt) - making it perfect for portable and battery-powered projects. It has built in thermal and over-current protection, but we could barely tell it got hot. There's even a volume trim pot so you can adjust the volume on the board down from the default 24dB gain. This board is a welcome upgrade to basic "LM386" amps! The A+ and A- inputs of the amplifier go through 1.0uF capacitors, so they are fully 'differential' - if you don't have differential outputs, simply tie the Audio-pin to ground. The output is "Bridge Tied", meaning the output pins connect directly to the speaker pins, no connection to ground. The output is a high frequency 250 KHz square wave PWM that is then 'averaged out' by the speaker coil - the high frequencies are not heard. All the above means that you can't connect the output into another amplifier, it should drive the speakers directly. It comes with a fully assembled and tested breakout board. We also include header to plug it into a breadboard and a 3.5mm screw-terminal blocks so you can easily attach/detach your speaker. You will be ready to rock in 15 minutes! Speaker is not included; use any 4 ohm or greater impedance speaker. Specifications Output Power: 2.5W at 4, 10% THD, 1.5W at 8, 10% THD, with 5.5V Supply 50dB PSRR at 1KHz Filter-less design, with ferrite bead + capacitors on output. Fixed 24dB gain, onboard trim potentiometer for adjusting input volume. Thermal and short-circuit/over-current protection Low current draw: 4 mA quiescent and 0.5 mA in shutdown (due to pullup resistor on SD pin) 15mm x 24mm x 2mm (0.6" x 0.9" x 0.08") Weight: 1.4g Note: The terminal block included with your product may be blue or black. Resources & Downloads EagleCAD PCB files on GitHub (off-site) Fritzing object available in Adafruit Fritzing library (off-site)