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How much juice can a regular guitar pot take?

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  • How much juice can a regular guitar pot take?

    A friend needs a pot for his kids science project or something. 9 volt battery.

    Will a regular 250k pot take the volts and say a single amp?

    Honestly asking for a friend. This time...

  • #2
    I believe most guitar pots are rated at 1/4W.
    You'd probably want something more heavy duty for a full one Watt.

    Then again, for a short duration it might be okay.
    I'd keep it on a heat-resistant surface and well away from anything that could burn or melt, though.
    .
    "Brains have been washed. Fear has been mongered. Now we prepare for the final stage of our conspiracy theory." - Isle Of Dogs

    .

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    • #3
      Okay thanks. Probably not a good idea then.

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      • #4
        You would need 250,000 volts to push 1 ampere of current through 250 kOhms of resistance. That would dissipate 62.5 gigawatts of power in the resistor.

        A 9-volt battery would push about 0.036 mA of current through a 250 kOhm resistance. That is about 0.324 miliwatts. 0.000324 Watts.
        It sounds great right now! Lets see if we can break it!

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        • #5
          Yeah, worried about that too...

          https://youtu.be/1qNeGSJaQ9Q

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          • #6
            Why not buy a cheap rheostat at Home Depot or Lowe's? Or do you need the extra post?

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            • #7
              Do you know what they are trying to do with a potentiometer and 9V DC?
              It sounds great right now! Lets see if we can break it!

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              • #8
                Originally posted by Little Pigbacon View Post
                Do you know what they are trying to do with a potentiometer and 9V DC?
                No but isn't a rheostat basically the same thing as a pot but with only 2 legs?

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                • #9
                  Originally posted by solspirit View Post

                  No but isn't a rheostat basically the same thing as a pot but with only 2 legs?
                  This article seems to do a good job of explaining their differences and similarities. The potentiometer is useful because it is a nice, self-contained voltage divider; thats how the volume controls in our guitars work.

                  https://octopart.com/blog/archives/2...should-you-use
                  It sounds great right now! Lets see if we can break it!

                  Comment


                  • #10
                    Originally posted by Little Pigbacon View Post

                    This article seems to do a good job of explaining their differences and similarities. The potentiometer is useful because it is a nice, self-contained voltage divider; thats how the volume controls in our guitars work.

                    https://octopart.com/blog/archives/2...should-you-use
                    I'll check that out later for sure, thanks.

                    What's TCW trying to accomplish?

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                    • #11


                      All joking aside, there is really no good way to find out.
                      It sounds great right now! Lets see if we can break it!

                      Comment


                      • #12
                        It might be fun to get an LED and a fixed resistor for current limiting, and demonstrate the voltage divider principle and the effects of varying voltage on the LED, how the visible light output varies with voltage. Then try it in a darkroom, and then again with an infrared LED and an IR camera.
                        It sounds great right now! Lets see if we can break it!

                        Comment


                        • #13
                          A friend's kid has a science project to do.. I don't know the details,, but probably something to do with batteries and bulbs. I was thinking of donating a used guitar pot, but it was late at night, and I was "a bit tired" at the time.

                          That's all.

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                          • #14
                            Why don't the 9 volt batteries in our guitars damage the pots?


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                            • #15
                              Originally posted by Securb View Post
                              Why don't the 9 volt batteries in our guitars damage the pots?
                              The full 9 volts never falls across the pot, first of all. It powers the preamp inside the pickup (if youre an active-pickup fan). The small AC signal generated for the pickups output is what falls across the full value of the pot. But none of that matters anyway, for the life expectancy of the pot, because even if you used two batteries for 18V operation and all that voltage fell across the input of the pot, it would deliver only 0.01296 W into the resistance of the pot.
                              It sounds great right now! Lets see if we can break it!

                              Comment

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