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 Circuit for energizing a relay

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T O P I C    R E V I E W
n/a Posted - Jan 17 2004 : 9:00:43 PM
Hello folks,

I have reviewed the circuit for the ring detect w/light. I need very simular functionality except I would like to drive a small relay to close it's contact if ring voltage is detected. I don't want the relay to oscilate on/off but stay on during the presence of the ring voltage. This circuit will need to drive the requirements for the Night Ringer function of a BOGEN TPU-15 Telephone Paging Amplifier.

It's been quite a while since I''ve designed some I am rusty and could use some ideas.

Thanks much.

DLongan
1   L A T E S T    R E P L I E S    (Newest First)
Aaron Cake Posted - Jan 21 2004 : 09:22:32 AM
Put a large capacitor in parallel with the base of the transistor controlling the relay (in the circuit you mentioned).

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