Light control circuit diagram

  
Use of ordinary telephone ringing circuit KA2401 and peripheral components, the installation of the light control when the bell
Light control circuit diagram - schematic

simply access in the country (a) the "X" at the country (b), the light control circuit can be: external AC when the ringing signal input, KA2401 two 8-pin output signal ringing tone, if during the day, photodiodes 3DU resistance is small, the thyristor SCR turns on, ringing larger; if no light at night, 3DU resistance is (number Meg), only through the ringing signal attenuation by R2, ringing much smaller.




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