Audio amplifier for Arduino DUE

thingiverse

It's a small audio amplifier designed for the DAC output of the Arduino DUE. The input is a 10K+1K resistor voltage divider with a voltage follower, so it won't break the DAC. The test program is here : https://github.com/laurent-fr/arduino_audio https://www.youtube.com/watch?v=TnHLTKUaMsM Instructions Print the PCB (Eagle 7, free version). It's single sided with a ground plane, and shoud be easy to produce. You will need the following parts : C1,C3 10uF pol. Capacitor, isolation >=10V C2 220uF pol. Capacitor, isolation >=10V C4 470uF pol. Capacitor, isolation >=10V C5 1nF Capacitor C6 47nF Capacitor C7,C8 100nF Capacitor (decoupling) IC1 LM358N op amp IC2 LM386N audio amplifier J1 2xSIL Connector J2 4xSIL Connector R1 10K R2 10K potentiometer R3,R4 1K R5 10 ohms A small 8 ohms speaker You can test the board by applying a 0 to 2.5V AF signal to the input. (The power supply is +5V) To use the board on the Arduino Due, you have 3 pins to connect : Audio amp GND to Arduino GND Audio amp +5V to Arduino +5V Auidio amp input to Arduino DAC0 (or DAC1) A test program is available here : https://github.com/laurent-fr/arduino_audio