TV background lamp automatic switch production ----- TV Automatic Light

Keywords: TV background lamp automatic switch making TV background lamp automatic switch When watching TV, if you open a lot of tiles, you will have a certain background brightness in the room, then your eyes are not tired. The following figure is a background lamp switch circuit controlled by the TV. When watching TV, the background lamp h is automatically lit. After the TV is turned off, the lamp h is automatically extinguished. Be Be In the figure, Cz is a television electrical outlet, R1 and VD1-VD4 pressure drop in the normal operation of the TV, has no effect on the normal operation of the TV, where VD3 and VD4 two diode is turned on about 1.2V. After the voltage is filtered through the C, the trigger voltage is supplied to the thyristor V by R2, so that the V is turned on. At this time, the lamp h is on, the TV is turned off, and the V will turn the trigger voltage, the lamp H is immediately turned off. For remote control shutdown or timing, it still has a smaller current passage after shutdown, but because the R1 resistance is small, its pressure drop is small, and VD2 and VD3, VD4 are still not turned on. Silicon still does not have a trigger voltage, so the lamp H is equally extinguished.

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