A UJT relaxation oscillator is commonly used to generate triggering pulses for an SCR. The capacitor charges gradually and then discharges rapidly when the UJT fires, producing a sawtooth waveform.
UJT when used for triggering as SCR, has waveform
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This question is part of 📡 Electronics and Communication Engineering (ECE) within the broader 🛠️ Engineering Essentials subject and appears in the PTS Pakistan Testing Service preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.