I'm trying to implement a variable frequency buzzer using a PWM pin, and it works well other than occasionally resetting my arduino. Here's the circuit: [image] The speaker is 8 ohm and hooked to the pin connector in the diagram. The transistor bases go to pin 13. This also has the nice side effe…

PWM audio amplifier circuit crashes arduino.

Grumpy_Mike May 20, 2014, 2:25pm 5

No decoupling will overcome the problem, no need for a separate supply.

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