and in fact that’s what [Dave]’s first LED tester was, in essence. Set an LM317 circuit up to output 10mA, say, and you can safely test out about any LED. Read off the operating voltage ...
The Family Handyman on MSN7mon
How to Use Cheap Electrical Testers and Voltage DetectorsIt has an LED that illuminates — and it may also ... Turn the circuit off again as soon as you finish the test. Circuit ...
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