Selection of R and C:
In the circuit, R is required to pass only capacitor charging current. At the instant when VP is reached; R should supply the peak current. It is thus, necessary, that current through R should be slightly greater than the peak point.
Once UJT fires, VE drops to the valley voltage VV . IE should not increases beyond the valley point IV, otherwise UJT is taken into the saturation region and does not switch back, R therefore should be selected large enough to ensure that
As long as R is selected from these extremes, reliable operation results.
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