500K Ohm Mini Trim Potentiometer - Page 2 - Home Theater Forum and Systems - HomeTheaterShack.com

Old 05-07-09, 12:50 PM Thread Starter
Senior Shackster
George

Join Date: Jan 2009
Location: Lafayette, LA
Posts: 152
Re: 500K Ohm Mini Trim Potentiometer

I understand the first part, but can you help me out on the subtraction part. Suppose I leave one pin free for measuring purposes on a 100K pot. I get a reading of 75K. What is the value?
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Old 05-07-09, 05:15 PM
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SturmMD

Join Date: Dec 2008
Location: Minneapolis, Minnesota
Posts: 165
Re: 500K Ohm Mini Trim Potentiometer

Before you solder the pot in measure the full resistance (outer pins). It won't be exactly 100K for example. Also turn it to about 1/4 1/2 and 3/4 positions and measure both sides. Check that they add up to close to the same value (~100K) for each position.

Then when it is soldered in, if you measure from the free pin to the center and get a reading of 75K that means that (100K-75K)=25K is what it is set to. The measurement taken before soldering will make this calculation more accurate. And since you're spending the money on the really precise 10 turn pots it would be a waste to not use this technique.
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Old 05-08-09, 12:00 AM Thread Starter
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George

Join Date: Jan 2009
Location: Lafayette, LA
Posts: 152
Re: 500K Ohm Mini Trim Potentiometer

Got it. Thanks for taking the time. I'm still trying to figure out where they put the carburetor on my car.
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Old 05-08-09, 05:31 AM
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Mike

Join Date: Apr 2007
Posts: 19,397
Re: 500K Ohm Mini Trim Potentiometer

You could try adding the potentiometer to your carburetor and dialing in the gas mileage!

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