a TV set automatic shutdown control circuit consisting of 555

Published:2011/7/8 2:18:00 Author:Fiona | Keyword: automatic shutdown control | From:SeekIC

When there is a television program,the sync signal from point A makes BG1 saturated conduct,BG2, BG3 conducts, so that 555 is set due to thepin ② is low level, the high level output by ③ feet makes JB put together, J1 is closed and the TV power supply connects up; when the television program is aired, synchronous signal disappears, BG1, BG2 end.C2 which has been charged discharges through the emitter of R5, BG3 and makesBG3 stay about 10 minutes conducting timeto avoid the undue off phenomenon caused by intermittent or replacement when program broadcasts.



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