Discrete sound and light control stairs delay switch circuit(7)

Published:2011/6/30 1:29:00 Author:Ecco | Keyword: Discrete, sound, light, control , stairs delay switch | From:SeekIC

In the circuit: ①it adds a light-emitting diode LED, which can emit low-light at night to play indicating switch role; ② it increases the light control sensitivity adjusting resistor R7which can adjust the light control point; ③ The two ends of RL are connected a capacitor C3 in parallel to improve anti-jamming performance of light-control circuit; ④ the additional diode VD5 can improve circuit reliability; ⑤ VT2 and VT4 use direct coupling resistors to improve signal transmission efficiency.



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