Schematic

Overview

This schematic is the subsystem that creates audio feedback from the Micro controller using a PWM to audio chain. A PWM signial is filtered and level biased then buffered by a Op Amp referenced to a mid rail Vref = VDD/2, R3/R4 with C1. Power is provided by a 9V 3A wall adapter feeding a custom 5V regulator that creates the VDD=5V. Test points are included on VDD, GND, RA2(PWM), VOUTA, and to the lead 1 of the speaker to help troubleshooting

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Resouces

The schematic as a PDF download is available here