Transistor Q1 is modeled as 2N3563 and can be combined with associated components into an oscillator circuit that oscillates only if the test clip is connected to a good transistor. The output of the oscillator is rectified by two 1N4148 diodes and filtered through C1, which is a 0.1μF capacitor. The positive voltage across the capacitor is used in the base of Q2, Q2 is the other 2N3563, and then Q2 begins to conduct.
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