Discrete sound and light control stairs delay switch circuit(6)

Published:2011/6/30 1:47:00 Author:Ecco | Keyword: Discrete, sound , light , control , stairs delay switch | From:SeekIC

The sound and light control stairs delay switch circuit shown as the chart uses an improved piezoelectric ceramics for the sound -power transducer, due to the sensitivity to sound signal of piezoelectric ceramics is lower than electret condenser microphone, the audio amplifier uses VT4 ~ VT6 three voltage amplification to enhance the switch's responsiveness to sound. Circuit delay time is mainly decided by R3, C2, and the icon data is about 1min.



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