Electronics > Beginners

Potentiometer Range

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vidarr:
I have a recycled potentiometer that I want to use on very simple 3.3-5v projects. Right now, I am only getting a range from 2.9v to 3.10v. I saw some tutorials of people scraping the pots to decrease the resistance, so maybe I could get up to (or closer to) the full 5v? But, I don't see a way to easily do that with the one I have.

Is there an easy way to do this another way? It can be very crude. I do not need precision here. I just need it for dimming LEDs, and for quickly prototyping simple stuff like that (real fast without using PWM).

Thank you!

ataradov:
Potentiometers don't have voltage ranges. Show us how you use it.

vidarr:
Like this pic.

vidarr:
I saw another schematic with a resistor in parallel with the LED after the pot. I did not try that yet.

ataradov:
And what voltage do you measure? And what is the value of a fixed resistor? What is the battery voltage?

Variable resistor typically go from 0 OHm to their nominal value. Shaving them can only increase the nominal value.

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