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- Newsgroups: sci.electronics
- Path: sparky!uunet!melpar!doherty
- From: doherty@melpar (Kevin Doherty)
- Subject: Re: HELP: non-intrusive current sensor
- Organization: E-Systems, Melpar Division
- Distribution: usa
- Date: Fri, 6 Nov 1992 14:22:17 GMT
- Message-ID: <BxAt96.FA4@melpar>
- References: <1992Nov5.214614.14507@magnus.acs.ohio-state.edu>
- Lines: 14
-
- 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.
-
- Mark, I suspect your problem was that you ran BOTH AC wires through the
- coil. This means there was zero net current to be measured (since the
- current in each of the hot and neutral leads was equal and opposite).
-
- Try running one of the wires thru the coil and see if that helps.
-
- Kevin
-