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If a circuit has a source impedance such that it wants to see a 2,000,000 ohm load,
and you load with anything below 200,000, you have essenially shorted the source,
meaning that the output voltage is now about 10% of what it should be. With 1000
ohms, it would be much worse. A short-circuit need not be exactly 0 ohms, it
just needs to be much smaller than the optimum load impedance.
I will look for a correct pot for you, and as you said if anyone has ideas, please
come forward with them. Regards.
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