PWM test on an old speaker

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This is a simple pulsing circuit driving a mosfet connected to a speaker. It lets you control duty cycles and frequencies of the timer chip output. This was copied from irondmax's design who based it on a Dave Lawton circuit. It will be used with an inductor as a buck converter for HHO production. Thanks to everyone for sharing your ideas. Sorry about the poor video.... cheap camera I guess.
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