K8086 - Telephone Ring Detector with Relay Output


I was hoping that this kit would give me a constant output but I find that it’s cutting out momentarily after each ring. How can I modify it to keep the relay energized longer? It is already set for “constant”.


You could try by enlarging C3 to a higher value. Please experiment.

I would add a Timer Relay board, they can take an input and turn on for as long as you like…