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Author Topic: Circuit needed  (Read 3232 times)

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Offline brianb

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Circuit needed
« on: May 19, 2009, 04:39:55 PM »
I don't know about your whole design but...   You might be able to put a large capacitor on the ringer signal going into the relay.   The cap may be enough to smooth out the pulsing, and allow the relay to hold longer.   The cap would be placed in parallel, not series with the relay...
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Offline brianb

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Circuit needed
« Reply #1 on: May 19, 2009, 05:38:10 PM »
Yeah, guess you would need an AC to DC rectifier...  I completely forgot it's AC... Good call...



Here is a site with some ring tone detection circuits...

http://www.tkk.fi/Misc/Electronics/circuits/telephone_ringer.html
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