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In Reply to: RE: Just a FWIW... posted by cpotl on March 6, 2015 at 15:15:30:
Then what is relevant here is the contact resistance of the wiper. Can't be more than a few ohms. That resistance will be in parallel with the grounded half of the pot. still only a few ohms. This will form a voltage divider with the rest or the impedances in the circuit. Let's look at those. You have the source impedance of the input devise in series with a 91K resistor. This is in parallel with the input impedance of the load devise. And this mess is in series with the shunt resistor. Add all this up and you get a big number. So, the noise voltage will be attenuated by the contact resistance (very small #) divided by a very large number. Like I said, as long as the impedance to ground is low, how are you going to generate much noise voltage?
"It is better to remain silent and thought a fool, then speak and remove all doubt." A. Lincoln
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Follow Ups
- RE: Just a FWIW... - JKT 03/6/1516:06:21 03/6/15 (1)
- RE: Just a FWIW... - cpotl 16:57:38 03/6/15 (0)
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