Re: Slaved power control 'current transformer'

["Stuart Meier" <stuartm2007@xxxxxxxxx>]

That's the principle, Chris, except it can only go round one wire of
the two
and needs 100s of turns ('current transformer') then amplification etc. I
can build it, but surely someone has one as a pre-built module for around a
fiver? Closest so far is about £12.50 for an 'Intelliplug' then rip
its guts
out...

Stuart


----- Original Message -----
From: "Chris Hunter" <cjhunter@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Tuesday, August 21, 2007 6:45 PM
Subject: Re: [ukha_d] Slaved power control 'current transformer'


> 'wonder if some loops of wire, around the cable to the cooker,
> connected to an (eg: Idratek) analogue inpit device would work - via
> a simple rectifier & smoothing circuit, say ???
>
> Chris
>
>
> On 21 Aug 2007, at 07:51, Stuart Meier wrote:
>
>> I want to detect power starting to flow in one circuit, to trigger
>> a second.
>> EG, if any power is drawn by the electric cooker, the hood fan
starts.
>> Direct connection is out for various reasons - the detection has
to be
>> electrically isolated.
>>
>> It requires a so 'called current transformer', but I can't find a
>> supply of
>> one, apart from in those extension leads with a 'master switch'. I
>> guess
>> could tear the guts out of one, but a supplier must exist. I could
>> build one
>> from scratch (op amps etc), but want to avoid the hastle.
>>
>> Any suggestions?
>>
>> Stuart
>>
>>
>>
>>
>>
>>
>
>