From: John Woodgate
Subject: Re: Inductance to Voltage Converter
Date: Sun, 29 Sep 2002 11:30:21 +0100
Organization: JMWA Electronics Consultancy
Reply-To: John Woodgate
NNTP-Posting-Date: Sun, 29 Sep 2002 12:38:44 +0000 (UTC)
X-Newsreader: Turnpike (32) Version 4.01 <5Z8C9wtxbnpWyFnyfFzqmVF739>
I read in sci.electronics.design that Bruce Kingsley
wrote (in ) about 'Inductance to Voltage Converter', on Sat, 28 Sep 2002:
>As a mater of fact, yes (incredible memory!). One of the circuits suggested
>was a passive circuit using a LCR circuit, feeding into a signal diode, then
>a RC circuit, worked well. The problem is a slow drift (up in voltage),
>about 1mV per minute. The sine wave excitation for testing was a HP waveform
>generator which output was solid. We routine checked the sensor's inductance
>with a Fluke LCR meter which verified the stability of the sensor's
>inductance to .001 mH /hour. Metal film resistors were used and CK05 series
>capacitors. Ambient test lab temperature stable to about +- 3 deg F per
>Wrong selection of components?
It doesn't seem so, but without the schematic it is uncertain. Can you
post and ASCII schematic here or a drawing on a.b.s.e?
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
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