"Jim Thompson" wrote in
message ...
On Tue, 25 Jan 2011 14:13:47 -0700, Jim Thompson
wrote:

Anyone have a favorite circuit for a remote telephone ringer?

I have access to the phone line, but no close-by source of power, so
telephone line-powered or low battery drain.

Commercial purchase also OK.

Suggestions?

...Jim Thompson

Solved. Bought 10 units (five phone locations, 2-lines) from Hong
Kong at $5 each. Loud!

Next problem:

I need a circuit that closes a relay after X rings, X adjustable.

As before, line-powered preferred.

Helpful to the solution, I think, relay needs to close for no more
than maybe one second ;-)

http://www.electronicsinfoline.com/P..._flasher.shtml

Not line powered but has an appropriate opto circuit. I wouldn't expect
the load to be phone line powered.

Modify the circuit to fire a retriggerable monostable. Couple this to a
counter /
relay driver.



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