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From: "Richard Hosking"
Subject: Re: Oscillator with small resistance change
Date: Sun, 15 Dec 2002 20:58:47 -0800
X-Newsreader: Microsoft Outlook Express 5.00.2615.200
If the resistance wire had a current through it you could amplify the
voltage drop across it using an opamp
One end of the wire would be the reference (+) while the other would be the
inverting input (-)
The output of the opamp would drive a VCO ?4046 See the chip datasheet.
Verdons wrote in message
> I wish to make an oscillator whose frequency is controlled by a varying
> resistance of 0 to 5ohms ( a bit of resistance wire). I require a
> range of around 2:1 about 500 Hz. it seems hard to use such a small value
> resistance in the usual sort of oscillator circuits ( tends to short
> Does anyone have some ideas on how to achieve this. The circuits I have
> breadboarded seem to stall with such a low resistance.
> (Note Remove text spam from email or reply to NG)
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