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Resistors

Discussion in 'Electronic Basics' started by Roger Dewhurst, Feb 27, 2007.

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  1. Has anyone any ideas making resistors in the 1 ohm to 20 ohm range from
    materials likely to be around the house somewhere?

    R
     
  2. John Fields

    John Fields Guest

     
  3. I do not have dud one lying around just at the moment.

    Roger
     
  4. JeffM

    JeffM Guest

    5" length of pencil lead ~15R.
     
  5. That is the sort of thing!

    Thanks.

    R
     
  6. John  Larkin

    John Larkin Guest

    Iron picture-hanger wire? Aluminum foil? Christmas tinsel (aluminum,
    not mylar.) Light bulb filament? Copper wire from some transformer or
    motor? Telephone wire?

    Rip apart an old radio or computer or TV?

    John
     
  7. Why would you want to? Wattage? Voltage?


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  8. To mimic a flat 12 volt lead acid battery. Say 25 watts. 12 volts, more or
    less.

    R
     
  9. Bob Masta

    Bob Masta Guest

    If you are just looking for a dummy load that can handle some
    power, consider wiring up a parallel array of whatever resistor
    value is available to get the target R, then immerse the array
    in liquid.... water will be fine in this case, oil in general. The
    liquid provides good heat transfer, and if you have a big-enough
    volume you can run the load for a while before the liquid heats
    up too much. This trick won't work for continuous duty, but
    you probably don't need that, I'm guessing.

    In the "olden days" there were construction articles in
    Popular Electronics that used this general approach
    to make a high-power dummy load for transmitters.
    They housed the whole works in a gallon paint can
    filled with oil.

    Best regards,


    Bob Masta

    D A Q A R T A
    Data AcQuisition And Real-Time Analysis
    www.daqarta.com
    Scope, Spectrum, Spectrogram, Signal Generator
    Science with your sound card!
     
  10. John Fields

    John Fields Guest

     
  11. Steel rebar wire. You can buy a 100' roll for a couple of dollars at
    hardware stores and construction rental stores. Wrap it around a pencil
    until you get the resistance you want. It will heat up a great deal if
    enough current is present, so plan on the oil bath cooling or comeup with a
    way to keep pouring cold water over it.
     
  12. I hand built a resistor motor starter once using electric radiator elements.
    Try an appliance parts store - they may have broken ones for free.


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