Simple Ring Detector


Posted on Jun 15, 2012

This circuit detects the 20-Hz approximately 86-Vrms ring signal on telephone lines and initiates action in an electri


Simple Ring Detector
Click here to download the full size of the above Circuit.

cally isolated circuit. Typical applications include automatic answering equipment, interconnect/interface and key systems. The detector is the simplest and provides about a 1-mA signal for a 7-mA line, which loads for 0.1 s after the start of the ring signal. The time-delay capacitor provides a degree of dial-tap and click suppression, and filters out the zero crossing of the 20-Hz wave.




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