The simple Diode and LED Tester presented ... If the diode being tested were open-circuit both LEDs on ... When the right plate of C1 reaches about 0.6V there will be sufficient base bias for Q2 ...

Jenny, I love this series, but paragraph 4 of the common emitter biasing discussion should say, “In an NPN transistor, the connection between base and emitter is a PN junction, so as you might ...

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