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Published on: September 2, 2013 / Comments: None

A pretty lightweight pocket audio clip player

Now, how do you plead?

Why over-complicate things ?  Sometimes all you need is something simple.  Paul over at DorkBotPDX decided his Monty Python theme costume needed a little extra flair, so he built a tiny sound clip player using some transistors, a teensy 3.0, a battery, and a speaker.

The circuit is pretty simple, a 9V battery gets regulated down to 5v to run the teensy.  The teensy does some quick pwm changing on a single pin while parsing a specially crafted audio file.  The pwm pin fires into a single transistor that then fires either a PNP or a NPN transistor at 9V which turns a small pwm signal into a big pwm signal.  The signal runs through a small inductor and decoupling cap to an 8 ohm speaker.

He’s got a schematic, a teensy 3.0 sketch, and instructions on how he converted the audio clip into the right format over on his blog.  Check it out.

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