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  1. #1
    Join Date
    Sep 2010
    Location
    miami,fl.
    Posts
    614

    variable resistor

    basically im looking for a variable resistor with a knob or something similiar if you find a bad resistor you can drop in this adjustable resistor as a temporary. i looked at radio chack they have some that say 15k ohms i was told thats the max resistance but it can be set to anything lower but it also said 500 vdc the guy at radio shack said where ever i use it at it must use 500 vdc or elso the resistor wont work properly??? is that true?? what do yall use as a temporary resistor???

  2. #2
    Join Date
    Jan 2003
    Location
    USA
    Posts
    1,670
    Any potentiometer should work as long as you don't exceed the power rating. 500vdc would be the max, but it would work fine at lower voltages. Asking the RS guys about their components is like asking bus driver how to fly the space shuttle.
    Propagating the formula. http://www.noagendashow.com/

  3. #3
    Join Date
    Mar 2011
    Location
    North Carolina Piedmont Area
    Posts
    449
    I wonder if a decade box would work?

  4. #4
    Join Date
    Apr 2011
    Location
    Pennsylvania
    Posts
    121
    Quote Originally Posted by orion242 View Post
    Asking the RS guys about their components is like asking bus driver how to fly the space shuttle.
    Isn't that the truth! They have officially morphed into a mobile phone sales store, but I'm thankful that they at least still carry some electronic parts.

  5. #5
    Join Date
    Sep 2006
    Location
    Alaska
    Posts
    459
    I basically try to keep a wide assortment of resitors that I normally need. If you have a good assortment you can combine resisters in parallel to lower the resistance and connect in series to raise the resistance.

  6. #6
    Join Date
    Dec 2002
    Location
    in a house, Appomattox, Va.
    Posts
    3,290
    like one of guys said, a box w/ switches to set approximate resistance, and maybe the adjustable one to set exact.
    Col 3:23


    questions asked, answers received, ignorance abated

  7. #7
    Join Date
    Apr 2005
    Location
    Boulder,CO.
    Posts
    552
    I am a ham radio operator and today they should change their name to Cell Phone Shack I'm suprised the guy even knew where the resistors were let alone variable our store is a complete loss. But I bet he asked if you needed batteries! got to ebay you can usually get decade boxes fairly cheap.

  8. #8
    Join Date
    Oct 2003
    Location
    Minnesota
    Posts
    1,376
    Quote Originally Posted by anthonyac1 View Post
    basically im looking for a variable resistor with a knob or something similiar if you find a bad resistor you can drop in this adjustable resistor as a temporary. i looked at radio chack they have some that say 15k ohms i was told thats the max resistance but it can be set to anything lower but it also said 500 vdc the guy at radio shack said where ever i use it at it must use 500 vdc or elso the resistor wont work properly??? is that true?? what do yall use as a temporary resistor???
    Well, it's like a lot of places these days. Pretty common to walk into a Radio Shack, or a hardware store for that matter, and find that they have precisely 1 person on staff who has a clue about the technicalities of what they're selling ... and that person isn't there right now. The rest are just sales clerks.

    Anyway, I have a couple potentiometers in a kit I keep in the truck, but to tell the truth ... I pulled 1 out and used it to test something 3 times in the past 10 years. None of those recently.

    Too much hassle and bother frankly.

    How many different resistor value requirements do you actually have to deal with?

    In my case there are 2 I need a lot. Another 4 I need less frequently but often enough to keep a supply handy. I keep them in a middling size plastic parts case. Along with some other misc devices such as transorbs, diodes, these tiny little fuses needed by some items I work with, etc. I find the plastic parts case handly as I can readily find what I'm looking for and immediately see if I'm getting low on something and need to replenish the stock.

    Just for "in case of need" sake, I also bought one of the large variety assortment bags of resistors, from Radio Shack. I forget which, but it's got something like 50-60 different values. I've actually broke that out more than I have the potentiometers. Handy if you just have to make do ... NOW ... just to get something working.

    The problem with potentiometers is that you either need a variety with different ranges or you're gonna have the devil of a time "dialing" one in reasonably. For instance if you need a 500 ohm resistor and all you've got is a 15k pot, it can take a light touch to get the setting just right. And with the cheap pots, breath on it wrong and you'll need to readjust it.

    Just my thoughts.

    Myself, I'll stick with my method. Those "most used" resistors I keep a supply of, its not that many different ones, and I buy the precision resistors. It just avoids the hassles. And I'm not fond of redoing stuff. Coming back to remove a pot and install a resistor doesn't appeal to me.
    A site where I stash some stuff that might be interesting to some folks.
    http://cid-0554c074ec47c396.office.l...e.aspx/.Public

  9. #9
    Join Date
    Mar 2011
    Location
    North Carolina Piedmont Area
    Posts
    449
    Osiyo thanks for the link. That will make for good reading one day

  10. #10
    Join Date
    May 2007
    Location
    Alabama
    Posts
    909
    Rat Shack SUX......If you need electronics......http://www.digikey.com/

  11. #11
    Join Date
    Jan 2003
    Location
    USA
    Posts
    1,670
    Propagating the formula. http://www.noagendashow.com/

  12. #12
    Join Date
    Dec 2004
    Location
    Caledonia WI
    Posts
    881
    It was nice to be able to go to Radio Shack years ago. At one time they were the only game in town for the average Joe because many other places didn't want to sell to non businesses.
    Nothing is magic, it works or doesn't work for a reason.

  13. #13
    Join Date
    Sep 2010
    Location
    miami,fl.
    Posts
    614
    i appreciate everyones input and advice. mainly i need it for failed thermistors as a temporary fix. honestly i rarely see them go bad but i like to have everything on my truck. i was checking out the variety pack of resistors i was going to get a pack then i heard a guy mention get a variable resistor with a wide range hmmm that sounded interesting so thats why i was asking for your input. i figured the guy didnt know what he was talking about at radio shack but i wasn't 100% sure myself so i wasnt going to knock his advice. im going to pick up a pack of resistors just to have on the truck just in case

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