hey,
i'm using a LM324 opamp configured as a diff amp. the inputs come from opamp followers, so there shouldn't be any loading issues.
when i vary the input connected to the inverting (-) terminal everything's fine - i see a clear change in the differential output. but when i vary the input connected to the non-inverting (+) terminal there's no change in the output. any ideas? (fyi, diff gain is currently 4.7 [470s over 100s])
thanks so much!, sam
How about posting a circuit diagram so as to check it's right ?
Are any inputs close in voltage to the power supply voltages btw ?
Graham
yep - i forgot to use a split supply, so it was trying to drive the output below 0 when there was no way that was possible! thanks!
-sam
It's nice when there's a simple answer ! ;~)
Graham
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