Audio amplifier for Arduino DUE

thingiverse

It's a compact audio amplifier engineered specifically for the DAC output of the Arduino DUE. The input uses a 10K+1K resistor voltage divider coupled with a voltage follower, ensuring it won't compromise the DAC. For testing purposes, check out this link: https://github.com/laurent-fr/arduino_audio Additionally, you can refer to this YouTube video: https://www.youtube.com/watch?v=TnHLTKUaMsM To assemble the device, print the PCB (Eagle 7, free version), which is a single-sided design with a ground plane. This makes it easy to produce. You will need the following components: * C1,C3: 10uF polarized capacitors with an isolation rating of >=10V * C2: 220uF polarized capacitor with an isolation rating of >=10V * C4: 470uF polarized capacitor with an isolation rating of >=10V * C5: 1nF non-polarized capacitor * C6: 47nF non-polarized capacitor * C7,C8: 100nF capacitors (for decoupling) * IC1: LM358N operational amplifier * IC2: LM386N audio amplifier * J1: 2x SIL connector * J2: 4x SIL connector * R1: 10K resistor * R2: 10K potentiometer * R3,R4: 1K resistors * R5: 10 ohms resistor * An 8-ohm speaker You can test the board by applying an audio frequency signal of between 0 and 2.5 volts to the input. Note that the power supply is +5V. To connect it to the Arduino Due, you need to connect three pins: Audio amp GND to Arduino GND, Audio amp +5V to Arduino +5V, and Audio amp input to Arduino DAC0 (or DAC1). A test program is available here: https://github.com/laurent-fr/arduino_audio