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Audio Clip Player

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Paul Stoffregen writes:

Yesterday I made a little audio clip player for a Monty Python Flying Circus theme party. It plays the 3 second dramatic sound for the unexpected Spanish Inquisition entrance.

The hardware is pretty simple. It’s just a Teensy 3.0 that “plays” the audio using a PWM pin.

The PWM is amplified to a 9V signal using a NPN transistor, then a pair of transistors buffer the signal to the current required to drive an 8 ohm speaker.

I had intended to make a nice L-C filter to remove the PWM carrier, but only the 100 uH inductor made it onto the breadboard as I quickly put this thing together in only a couple hours.

Read more here for source code and more!


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