Ring wave detector circuit

Published:2011/5/9 10:06:00 Author:Christina | Keyword: Ring wave, detector | From:SeekIC

The optical isolator with the neon light and photosensitive resistance can be used as the interface between the telephone line and the ring. The neon light will turn on if there is the 100Vac ring signal, at the same time C1 is isolated to keep the battery voltage range. If we use the varistor RLC1, the rated voltage of the capacitor can be reduced to 400V. The SCR switch Q1 and the line transformer primary series connection supply the 20HZ ringing frequency synchronization for the phone system.



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