Light control circuit diagram

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

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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