Re: circuit that watches for phone ring and resets external device
- From: Ross Herbert <rherber1@xxxxxxxxxxxxxx>
- Date: Mon, 14 Aug 2006 03:45:53 GMT
On 11 Aug 2006 05:59:52 -0700, "visiperl@xxxxxxxxx"
<visiperl@xxxxxxxxx> wrote:
Hi all,
I'm looking for either a circuit, kit or prebuilt device that will hook
up to a phone line and when I dial that extension it will reset my DSL
modem and router.
All I need it to do is sense the incoming ring voltage momentarily
interrupt the power.
Does anybody have any suggestions?
Thanks
vp
Connect a 2uF, 250V capacitor in series with the ac inputs of a bridge
rectifier and connect this arrangement across the telephone line. The
+ve output from the rectifier connects to MT2 of a suitable TRIAC (I
used a BTA04-600) and MT1 connects to one side of a relay coil (I used
a DIL 48V dc relay with coil R = 7800 ohms). The other side of the
coil connects to the -ve terminal on the bridge rectifier. Across the
coil connect a 220uF 63V electrolytic with appropriate polarity. A
bi-directional trigger diode (I used a DB3) connects between MT1 and G
of the TRIAC. Works like a charm.
.
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- From: visiperl@xxxxxxxxx
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