Memory doorbell circuit

Published:2011/4/5 23:53:00 Author:Nicole | Keyword: memoory, doorbell | From:SeekIC

Pressed doorbell switch K1, the doorbell phonation, lighted up LED D3; if there are nobody to open the door, guests leave, D3 still on, this means there were guests came. Flip-flop is composed of T1, T2; D1, C1 form half wave rectification filter circuit, to support work voltage.



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