Re: Turntable Stroboscope
Ian's method is the way to go if you happen to have an Arduino on hand as the hardware is built for you, even down to there being an LED already on the PCB.
If you prefer a basic electronic circuit, this 4060 oscillator / divider (attached, from the internet), might be a good starting point. The output you'd need to use for 300Hz would be from pin 2, and you'd have to use that to drive a transistor or darlington pair, in turn driving an LED.
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