Quote:
Originally Posted by Humptydumpty
I will wait first and see if any members can come up with a soluton .
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Solutions aren't plucked out of thin air. You have to do some tests and post the results so that members can analyse them and make suggestions.
Is the pot the original 500kohm A law one?
Measure the resistance from the wiper, centre tag, of the pot to each end of the track, outer tags, in turn. While you're doing this rotate the knob to each extreme position in turn. If all is well the readings should be close to 500kohm at one extreme and close to zero at the other.
If with the knob in the centre position the reading is approximately 250kohm the pot has a linear law. If the reading differs significantly from this it has a logarithmic law.
Don't go off at a tangent and do something different. Do the tests suggested and post the results.