TV background light automatic switch production

TV backlight 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. FIG CZ is a television outlet, the voltage drop VD1-VD4 R1 and work in a small television set, no effect on normal operation of the television, wherein the two diodes VD3 and VD4 voltage drop of about 1.2V , the voltage through C filter, through R2 to provide the SCR trigger voltage V, so that V conduction, then bright lights H, the TV off, losing trigger voltage V, H lamp immediately goes out. For remote shutdown or time off the TV, while the shutdown circuit is still small current through the socket, but the resistance R1 is small, a very small pressure drop, this time VD2 and VD3, VD4 is still turned on, can be still not trigger silicon controlled voltage, the same lamp off H. Read more

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