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dual stacked, Push-pull guitar potentiometer
dual stacked, Push-pull guitar potentiometer
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Old 8th September 2019, 07:05 PM   #11
mozz is offline mozz  United States
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What if you used 2 resistors? Each end to the center wiper? Too lazy to wire it up today.
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Old 8th September 2019, 10:43 PM   #12
PRR is offline PRR  United States
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> What if you used 2 resistors?

Then what can the pot do? The result is essentially the two (fixed) resistors, until the pot is turned so close to the end that its end resistance is comparable to the fixed resistance. To "make 20:1 change", only the last 5% of the pot "does something", all the rest is "fixed" by the two resistors.

Also: R.G.'s essay is for POTS, potentiometers. There are several common situations where we use a 3-leg "pot" as a 2-leg RHEOSTAT. Often "reverse taper". Notably microphone amps and tremolo speed knobs. Slugging a resistor across a 3-leg pot won't do what you want here.
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Old 19th September 2019, 06:44 AM   #13
mcrobertg7 is offline mcrobertg7
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Quote:
Originally Posted by JMFahey View Post
Not to rain on anybody´s picnic but that simply is wishful thinking.
Parallel resistors are a VERY crude way to somewhat approach a desired curve, sort of, lots of limitations, work only on "volume controls" writing and only if driven by a low impedance; a mess on tobe controls, and even so, only within a narrow range.

So basically the low impedance load will tend to cut the highs out of the signal, right?
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