The sound source switch circuit composed of SCR

Published:2011/7/7 8:04:00 Author:Seven | Keyword: sound source, switch circuit | From:SeekIC

When the power is getting through, as the control pole of SCR1--SCR4 has no trigger current, so it is in the turn-off state, none of J1-J4 is taking action. If J1 pulls in, by pressing S1, the current will charges C1 through R2, point A is in a low LEV to the earth, T1 is blocked. As C1 is charged, the LEV of B is rising with the LEV of A. At that moment, the charge current of C1 is crossing the control of SCR1, so SCR is conducting, J1 is getting power and pulling in, LED1 is glowing, after S1 is released, as the effect of SCR1, J1 remains the same, C1 is discharging through R1.



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