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 Circuit for energizing a relay		  New Topic  Reply to Topic
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DELETED (Inactive)

1 Posts
Posted - Jan 17 2004 :  9:00:43 PM  Show Profile  Reply with Quote
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

Aaron Cake
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Canada
6718 Posts
Posted - Jan 21 2004 :  09:22:32 AM  Show Profile  Visit Aaron Cake's Homepage  Send Aaron Cake an ICQ Message  Send Aaron Cake a Yahoo! Message  Reply with Quote
Put a large capacitor in parallel with the base of the transistor controlling the relay (in the circuit you mentioned).
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