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Reply-To: "Dave M"
From: "Dave M"
Subject: Re: Detecting current drawn through wire...
X-Newsreader: Microsoft Outlook Express 6.00.2600.0000
Date: Thu, 03 Oct 2002 00:34:08 GMT
NNTP-Posting-Date: Thu, 03 Oct 2002 00:34:08 GMT
Organization: AT&T Worldnet
It would probably be easier to sense the application of mains voltage to the
security light rather than the current. Just hook up to the output of the
relay that energises the light, send it through a voltage divider, rectify
it and then into a transistor (or other technology) switch.
Dave M firstname.lastname@example.org
Remove the xx for my correct email address
"Mr_Ree" wrote in message
> I have installed a PIR security light (240vac - UK) and want to add an
> internal sounder. It would be very difficult to add any further wiring to
> the light, so I need to detect the vast increase in current drawn through
> the Live feed or Neutral return. I was thinking along the lines of
> a coil of wire around the cable and detecting the increase in magnetic
> I'm quite versed in electronics, but I'm not getting the time to sit &
> design , so looking for a jump start. Sounder driving & timing - no
> just the detection bit.
> Any ideas?
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