When John Dawson turns on his table saw
he wants a Shop-Vac®
to automatically turn on, too. He might have controlled a duplex outlet
from a wall switch, but where's the fun in that? Instead, he uses a Hall-Effect
sensor to detect current flow in the saw's power cord and then turn on the
vacuum cleaner via a relay. John's design adapts well to other control
situations, too. Don't get sucked into a simple switch circuit.
Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.