TD-318-VOECE_SW Project：Delay light control switch This circuit adopts the triode switch control circuit, which are widely used with hotel, residential corridor, toilet, office, corridor and so on. By light control, namely, strong or light during the day, under the effect of electric circuit, the lamp holder disconnect self-locking, voice control doesn't work, the LED is not bright. Through sound control switch, that is, in the dark with footsteps or clap to conduction light LED, circuit with functions of time delay, time delay shut down automatically after 1 minute to achieve energy saving. Working principle: 1. Ac 220 v through resistor capacitor into the diode rectifier into a dc voltage 2. This circuit is based on four triode 9104 to match the switch function; 3. Q1 in this circuit controlled by the MIC, MIC when receiving voice can emit frequency decreased B class 0.6 V load, triode disconnect, Q2 received acoustic signal; 4. Q2 is controlled by the photosensitive resistance, receives the conduction discharge when the strong light, the light is weak when disconnected; 5. Q3 switch role, by R4 for signal into conduction, B will save electricity within the capacitor C3 release; 6. Q4 controlled by C3, when C3 discharge, conduction to the LED power supply, when C3 disconnect after discharge, LED out;