Any idea where I can find a 50 ohm potentiometer?

Discussion in 'After Hours Lounge (Off Topic)' started by John Pine, Oct 16, 2003.

  1. John Pine

    John Pine Supporting Actor

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    I checked at Parts Express and a few other on-line suppliers. Any suggestions?
     
  2. Mark Schermerhorn

    Mark Schermerhorn Second Unit

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    digikey.com should have them. I'd be suprised if they didn't.
     
  3. John Pine

    John Pine Supporting Actor

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    Mark thanks for the link! I'm checking it out now. The site is a little hard to navigate for a layman.
     
  4. Greg_L_C

    Greg_L_C Stunt Coordinator

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    They Sell POTs at Radio Shack. Just curios, what are you doing?

    Greg
     
  5. John Pine

    John Pine Supporting Actor

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    Greg: Not a 50 ohm pot. I've built a custom enclosure for my audio equipment and I'm using (2) parallel wired 92mm computer case(2.1W/0.39amps @)fans mounted at the top to vent it. They are powered by an old Rat Shack 12V DC 1amp 25watt power supply. I've plugged the p/s into the "Switched" AC output on my HK525. I need the pot to adjust the fans. I've been told that a pot higher the 50 ohms will have to much resistance. I gotta go to bed, I'm outta' here!
     
  6. Greg_L_C

    Greg_L_C Stunt Coordinator

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    John,
    I've seen several PC cooling parts suppliers selling rheostat fan controls that would work for your application.

    Greg
     
  7. John Pine

    John Pine Supporting Actor

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    Good idea Greg, I'll check out that angle.
     
  8. Tim Kilbride

    Tim Kilbride Stunt Coordinator

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  9. John Pine

    John Pine Supporting Actor

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    Thanks Tim!
     
  10. John Miles

    John Miles Stunt Coordinator

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    Um, if you try to control 800 mA (or even 1/10 that much) worth of DC fans with a trimmer potentiometer, hilarity (and smoke) will ensue.
     
  11. Kevin P

    Kevin P Screenwriter

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    John's right. You'll need a potentiometer/rheostat with a minimum 25 watt rating to control those fans, or else you'll smoke the pot (ok, that didn't come out right!) [​IMG] . Or use an adjustable voltage regulator circuit instead of just a pot. Or get one of those universal AC adapters with the voltage switch (usually 3, 4.5, 6, 7.5, 9 volts). With that you can set the voltage to whatever drives the fans at the speed you want.
     

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