Operation of a Unijuction Transistor as an Over Voltage Detector:
In order to detect over voltage, a warning pilot lamp L is connected between the emitter and B1 circuit and so long as the input voltage is less than the peak point voltage of the unijunction transistor, the device remains switched off.
However, when the unijunction transistor is switched on and the capacitor discharges through the low resistance path between terminals E and B1. The current flowing in the pilot lamp L lights it up thereby indicating over voltage in the circuit.
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