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The Family Handyman on MSN10mon
How to Use Cheap Electrical Testers and Voltage Detectors
Every DIYer should have these three inexpensive electrical testing devices. They're handy even when you aren't doing ...
EDN15y
Circuit lets you measure zener voltages and test LEDs
Figure 3 Two LED drivers operating in series or parallel let you boost zener voltage or current. Figure 4 shows an assembled zener-diode-tester circuit. The zener diode under test is On ...