Dual-watch controlled SCR timer circuit (3)

Published:2011/5/19 0:41:00 Author:TaoXi | Keyword: Dual-watch, SCR, timer circuit | From:SeekIC

Working principle: the circuit is as shown. When you press the K1, the power supply will be changed into the 6V DC after the proess of step-down, rectify and filtering. At this time, the power NC contact point J-3 makes J1 to work, and J1's normally open contact point J1-1 closes, the circuit will lock itself. At this time if you release K1, the circuit is in the working condition because of the self-locking. When the timing boot audio signal is input from the two ends of A, B, this signal will be rectified and filtered by D3 and C3 to trigger the SCR1 and makes J2 to work, J2's normally open contact point J-2 closes, socket W has the electricity, the controlled appliances is connected. Similarly, when another electronic alarm clock's regular shutdown audio signal is input from C and D, this this signal will be rectified and filtered by D5 and C4 to trigger the SCR2 and makes J3 to work.



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