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What is PCB Drill Motor Speed Controller about?

The circuit uses a timer IC to pulse the voltage supplied to a PCB drill, decreasing the drill speed while maintaining power output. Pulsating the 15V input prevents stalling at lower voltages and reduces heat and wear on drill bits by slowing the speed. The timer is set to pulse the voltage between 0.1ms and 10ms, controlling the drill speed. The circuit effectively decreases drill speed for PCB work while still running from a standard 12-15V power supply.

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