Which of the following circuit is used to obtain pulse gate triggering?

Which of the following circuit is used to obtain pulse gate triggering? Correct Answer UJT based relaxation oscillator circuit

UJT relaxation oscillation:

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  • The uni-junction transistor (UJT) has two doped regions with three external leads. It has one emitter and two bases.
  • The emitter is heavily doped having many holes.
  • The UJT is used to trigger the SCR. 
  • The trigger voltage is equal to the capacitor voltage since the capacitor is connected between the anode and the ground.
  • When the capacitor charges to the trigger voltage, UJT turns ON, discharging the capacitor through R4, thus turning ON the SCR.
Bissoy MCQ

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