The mp3 module circuit adopts kt403a voice chip, tf booth and 80028 chip, among which kt403a voice chip is the main chip, the power supply of tf booth is provided by the main chip, 80028 chip is used for mono power amplifier, and the sampling circuit set voltage is 1.15v ~ 1.65v.
Further, the power supply module adopts a chip model ams1117-5.0, which has an integrated overheating protection and current limiting circuit.