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PCB Drill Speed Controller with 555

2015-02-28 19:00  
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PCB Drill Speed Controller with 555
Described here is a simple, inexpensive and useful circuit for electronics hobbyists. The circuit is nothing but a PCB drill speed controller, which can be used to control the speed of any 12VDC small pcb drilling units. Such portable units are now widely available, and even a hobbyist can make it without too much difficulty.