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- Path: sparky!uunet!zaphod.mps.ohio-state.edu!moe.ksu.ksu.edu!crcnis1.unl.edu!unlinfo!mpaul
- From: mpaul@unlinfo.unl.edu (marxhausen paul)
- Newsgroups: sci.electronics
- Subject: Re: HELP: non-intrusive current sensor
- Date: 6 Nov 1992 13:41:50 GMT
- Organization: University of Nebraska--Lincoln
- Lines: 18
- Distribution: usa
- Message-ID: <1ddsmuINNdhd@crcnis1.unl.edu>
- References: <1992Nov5.214614.14507@magnus.acs.ohio-state.edu>
- NNTP-Posting-Host: unlinfo.unl.edu
-
- mbattist@magnus.acs.ohio-state.edu (Mark A Battisti) writes:
-
- >I need a current sensor (On/OFF) for a standard 110 AC line which
- >gives a logic signal (5V). I tried running the live line through a coil
- >which I ripped out of a small transformer and then amplify the coil
- >response w/op amps but I could not get this to work.
-
- Get yourself a toroid core - it's just a little donut of ferromagnetic
- material - and have your "hot" line make a few loops through it. Run
- a second wire through it a bunch of times and you've got a toroidal
- transformer that ought to put out a signal proportional to the
- current on the 110 AC line.
-
- --
- paul marxhausen .... ....... ............. ............ ............ ..........
- .. . . . . . university of nebraska - lincoln . . . .. . . .. . . . . . . .
- . . . . . . . . . . . . . . grace . . . .
- . . . . . . . . happens .
-