Two-transistor Lamp Flasher Circuit Diagram The following schematic shows the Two-transistor Circuit Diagram. It is a "two-wire" circuit and simply connects in series with the load and battery. The circuit design consists of 9 volt battery (as the power source), one LED, 5 resistors, and 2 transistors. The two resistors on the base of the PNP set a threshold voltage and when power is applied the capacitor begins charging toward this voltage.



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