-1 to +1 amp
pfperry at melbpc.org.au
Thu Sep 3 14:35:14 CEST 1998
At 09:11 AM 3/09/98 +0100, jorgen.bergfors wrote:
>>BTW, there is a ckt in Horowitz and Hill 'Art of Electronics'
>>that shows how to vary the gain of an op amp stage from 1 to -1,
>>with a pot, which I found VERY HANDY for cv inputs..>
>What is this circuit like?
input goes to top of 10k pot, also via 10k resistor to - op amp input.
other end of pot to earth.
wiper of pot goes straight to + input of op amp.
10k feedback resistor from output to - input of opamp.
when wiper at top of pot, gain is +1
when wiper at earth end, gain is -1.
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