Light-Operated Ring Circuit Diagram

Published:2011/8/9 18:24:00 Author:Vicky | Keyword: Light-Operated Ring | From:SeekIC

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.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Electrical_Equipment_Circuit/Telephone-Related_Circuit/Light_Operated_Ring_Circuit_Diagram.html

Print this Page | Comments | Reading(3)