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Zener Diode Tester circuit
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Circuit lets you measure zener voltages and test LEDs - EDN
Diode Tester Circuit using 741 - Electronics Area
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Zener Diode Tester. Cheap and reliable. up to 24V - YouTube
Simple Zener Diode Tester under Repository-circuits -46329- : Next.gr
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How to test a diode
