CJMCU PAM8302 Audio Amplifier Module - 2.5W 1-Channel

Description
PAM8302 Mono Digital Audio Amplifier Module is a tiny 2.5 Watts mono amplifier, which works at class D. The module can be supplied by a 2.0V-5.5VDC power source and produce a powerful amplified sound into a 4Ω or 8Ω impedance speaker. Due to working at class ​​​​​​​D, it has high efficiency (over 90% efficient when driving an 8Ω speaker at over half a Watt). Tiny size besides high efficiency make it applicable in  widely portable and battery powered projects. Adjusting the output volume is done via a volume trim pot from zero to the default 24dB gain. The safety properties of the PAM8302 consist of protection against over-current conditions, and abnormal temperature conditions.uF capacitors, so they are fully 'differential', if you don't have differential outputs, simply tie the A- pin to ground. The output is "Bridge Tied" so 2 pins must be directly connected to the speaker pins, no ground anyone. The output is a high frequency 250KHz square wave PWM, so it's not a hearing sound, in the coil of the speaker, this PWM signal is averaged and made ,1.5W (at 8Ω)
Output speaker impedance: 4Ω, 8Ω
PSRR: 50dB PSRR at 1KHz
Gain: 24dB (an onboard trim potentiometer for adjusting input volume)
Size: 24mm x 15mm