DIAL_PULSE_INDICATOR

Published:2009/7/7 22:01:00 Author:May | From:SeekIC

This indicator senses the switching on and off of the 48-Vdc line voltage and transmits the pulses to logic circuitry. An H11A10 threshold coupler, with capacitor ftltering, gives a simple circuit which can provide dial pulse indication, and yet reject high levels of induced 60-Hz noise. The DHD805 provides reverse bias protection for the LED during transient over-voltage situations. The capacitive ftltering removes less than 10 ms of the leading edge of a 40-V dial pulse, while providing rejection of up to 25-V rms at 60 Hz.



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