Discussion
Which of the following devices can be used for a relaxation oscillator?
Answer: D
A relaxation oscillator makes a non sinusoidal wave (a sawtooth or pulse) by charging a capacitor through a resistor until a switching device fires and discharges it. The unijunction transistor (UJT) is the classic device for this: when the capacitor voltage reaches the peak point of the emitter characteristic the UJT turns on and quickly discharges the capacitor, and the cycle repeats.
An SCR is a latching switch used for power control, and a PN junction diode and a photodiode have no negative resistance region to make the circuit switch back and forth. The answer is UJT, option D.
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