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Light-Operated Ring Circuit Diagram

2014-11-03 15:59  
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Light-Operated Ring Circuit Diagram
Light-Operated Ring Circuit Average telephone ring circuit is composed of KA2401 and peripheral components. When adding light-operated ring circuit, just connects the part “X” in picture a with light-operated circuit in picture b. When there is input of AC ring signal into the exterior line, the pin 8 of KA2401 outputs ring signal of two tones. In the daytime, light sensitive tube 3DU has low resistance value, the SCR is conducted, and the volume of ring is relatively higher; in the evening, when there is no light, the resistance value of 3DU is very high (several megohms), the ring signal is weakened by R2 before passing through , so the volume of ring is much lower.