What is a 22R resistor

Discussion in 'The Projects Forum' started by majikdaze, Nov 2, 2012.

  1. majikdaze

    Thread Starter New Member

    Nov 2, 2012
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    Hi Everyone,

    this might be a little off what this thead is but what is is 22R resistor , I need one for a guitar pedal I'm working on but can't find out what 22R resistor means its beige in color, Thanks for any help
     
  2. bertus

    Administrator

    Apr 5, 2008
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  3. majikdaze

    Thread Starter New Member

    Nov 2, 2012
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    Sorry I'm new to forums, and not sure where to ask a question ,and thanks for links
     
  4. t06afre

    AAC Fanatic!

    May 11, 2009
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    If you have question to this forum. You always start a new thread in the proper section. Then you start a thread you own it, and you can take it in any direction you want;)
     
  5. John P

    AAC Fanatic!

    Oct 14, 2008
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    This website
    http://www.diyaudioandvideo.com/Electronics/Color/
    says:

    To simplify the writing of large resistor values, the abbreviations K and M are used for one thousand and one million. To keep the convention standard, R is used to represent 0. Because of problems in seeing the decimal point in some printed texts, the 3 letters: K M or R are used in place of the decimal point. Thus, a 2,700 Ohm resistor is written 2K7 and a 6.8 Ohm resistor is written 6R8.

    And 22R means 22.0 ohms.
     
  6. panic mode

    Senior Member

    Oct 10, 2011
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    exactly. it was a tradeoff that allowed use of cheaper / lower quality prints and marking and still have readable values. that way one could send by fax piece of circuit schematic and recepient would still have no problem telling the values (even if noise and erros in transmission would have introduced dozens of random dots, or random "white" dots where toner was not picked up). in case of component marking, one could expose component to variety of chemicals (solder flux, solvents and whatever is used to wash or remove flux) and manhandle it for a while - before marking would rub off so badly that it is no longer readable. single dot would be much less likely to survive same treatment. imagine what you get from something that was supposed to have .47uF on it. you could guess 0.47 or 4.7 or 47 and not be really sure. enforcing use of unit or multiplier made errors much less likely.

    if you see 22R, you would not confuse that with 0.22 Ohm or 2.2Ohm.
     
  7. Sparky49

    Active Member

    Jul 16, 2011
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    ..........
     
  8. vk6zgo

    Active Member

    Jul 21, 2012
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    It was really a solution looking for a problem.

    The occasions where the decimal point was invisible are few & far between,as most of the time,components like resistors are colour coded,so in a repair situation,you can crosscheck between the device & the schematic.
    It doesn't do any harm,though,& is helpful when people are building stuff.

    Back when Australia went Metric,the Metrication board decreed that dimensions of structural materials had to be specified in millimetres
    "In Case someone read 2.7m as 27m",or some such crud!

    Accountants didn't have any trouble using decimal points with money!:D
     
  9. Bob T.

    Member

    Oct 22, 2012
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    i think it is 22Ω resistor.
     
  10. n1ist

    Active Member

    Mar 8, 2009
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    The decimal point issue was on hand written, poorly printed, or photocopied schematics, not on the resistors themselves. On old, faded, folded schematics, it's very easy to pick up some schmutz that can look like an extra decimal point or have things fade enough to make you wonder if one was there.


    /mike
     
  11. vk6zgo

    Active Member

    Jul 21, 2012
    677
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    True enough,but I never really found it such a huge problem.

    Mostly,you have a fair idea what value to expect,anyway,& if you are fixing something,if the resistor isn't too cooked,the colour code gives you a pretty good clue as to its value.

    I never said it wasn't a useful idea,just that it wasn't filling a great unanswered need.
     
  12. Adjuster

    Well-Known Member

    Dec 26, 2010
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    Whatever may be the pros and cons of the method of marking component values, perhaps it would be best to remember the original topic: that the OP wanted to be sure of the resistor value, which we confilrm to be 22ohms resistance.

    It would also be wise to check the power rating of the component, which seems likely to be at least a watt, or more. Preferably, this should be confirmed by reference to a parts list, unless it is shown on the resistor body or on a schematic. Incidentally, reference to a schematic is always useful, and in this case might allow an experienced person to estimate the power rating needed.
     
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