PAM8302 Adafruit 2.5W Class D Single Channel Audio Amplifier Board
This super small mono amplifier is able to deliver 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. 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. 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” – that means the output pins connect directly to the speaker pins,no connection to ground. The output is a high frequency 250KHz square wave PWM that is then ‘averaged out’ by the speaker coil – the high frequencies are not heard. Speaker is not included, use any 4 ohm or greater impedance speaker.
1.Output Power: 2.5W at 4, 10% THD, 1.5W at 8, 10% THD, with ` Supply
2.50dB PSRR at 1KHz
3.Filterless design, with ferrite bead + capacitors on output.
4.Fixed 24dB gain, onboard trim potentiometer for adjusting input volume.
5.Thermal and short-circuit/over-current protection
6.Low current draw: 4mA quiescent and 1uA in shutdown mode
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