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From: firstname.lastname@example.org (Nico Coesel)
Subject: Re: Telephone Ring Suppressor
Date: Mon, 23 Sep 2002 09:52:57 GMT
NNTP-Posting-Date: Mon, 23 Sep 2002 09:43:07 +0000 (UTC)
X-Newsreader: Forte Free Agent 1.21/32.243
Jim Thompson wrote:
>On Fri, 20 Sep 2002 22:15:29 GMT,
>Jim Thompson ,
>In Newsgroup: sci.electronics.design,
>Entitled: "Telephone Ring Suppressor",
>Wrote the following:
>|Awhile back I posted an inquiry about a telephone ring suppressor that
>|could be switched in and out.
>|Rummaging through my junk pile looking for something else I found it
>|and snapped it apart... see photo on
>|It's nothing more than a full-wave rectifier that can be switched in
>|or out of the telephone circuit.
>| ...Jim Thompson
>It occurs to me that a better way to use this device would be to
>follow it with my own ring generator, then I can use the PC to read
>DTMF and direct calls accordingly.
>Any ideas/schematics for ring generators?
Over here it should be 15V to 75V AC at 25Hz. But 50Hz seems to work
fine as well. Most designs I've seen and made to create a CB (central
battery) use a dual pole relay that switches between 'audio source'
and ringer source. Be sure to insert a series resistor between the
ringer source for short circuit protection.
Reply to nico@nctdevpuntnl (punt=.)
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