_TIMER_CIRCUIT

Published:2009/7/7 4:08:00 Author:May | From:SeekIC

After one cycle of operation, SCR 1 will be on, and a low value of voltage is applied to the UJT emitter circuit, interrupting the timing function. When pushbutton S1 is pushed, or a positive going pulse is applied at point A, SCR 2 will turn on, and SCR 1 will be turned off by commutating capacitor CC. With SCR 1 off, the supply voltage will be applied to RE and the circuit will begin timing again. After a period of time determined by the setting of RE, the UJT witt fire and turn SCR 1 on and commutate SCR 2 off. The time delay is determined by the charge time of the capacitor



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