Discrete sound and light control stairs delay switch circuit(2)

Published:2011/6/30 1:05:00 Author:Ecco | Keyword: Discrete , sound , light , control, stairs delay switch | From:SeekIC

The improved sound and light control stairs delay switch circuit is shown as the chart, and it has higher sensitivity,and the reason is that the audio signal output by VT1 is doubler rectified by VD5, VD6 to turn into DC control voltage to trigger VT2, VT3 conduction, then VT4 is turned on, and light-emitting lamp E is lit. Circuit delay time is determined by the value of R9 and C4, and the time is typically tens of seconds. Capacitor C5 can absorb power grid interfere pulses to prevent false triggering.



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