Computers & Mobile Technology
Find out resistor values from your iPhone
iresistors.jpg

“iResistors” is a handy iPhone application for any maker with an iPhone. The free app lets you drag your finger across the color bars to pick the right color combination of the resistor in question. Pretty handy if you are not near the Internet and you need to check your values.

iResistors

20 thoughts on “Find out resistor values from your iPhone

  1. It’s a fairly simple scheme to convert from colour bands to the value. It was originally designed for an engineer to do in their head as quickly as someone could read a printed number.

    This app does sound useful as a portable quick reference, but if we’re at a point where an average person who would actually use a resistor needs to check online, then I’m very worried about our future.

  2. To: The Oracle

    Then you should be worried, I have not used a through hole resistor in years. All SMT, so now I completely forgot that wonderful mnemonic…. how does that go again :-)

  3. @Mike – The one I learned was Bad Boys Rip Off Young Girls But Violent Guys Win. Not sure how approprite it is for mixed company, but the person I learned it from had been an Engineer at GM, and you can imagine the culture there.

    The all SMT fact shouldn’t really be an issue. The tool is for people using through hole, and even now, most people learn on through hole devices.

    And I admit I can’t read it as fast as numbers anymore, it takes me a good 5 seconds to read a resistor these days. Not because of SMT but because I use a lot less resistors because parts counts are so low now.

  4. Yeah, this is pretty sad, if today’s hardware folks can’t remember a simple color code mnemonic. At first glance, I thought it used the camera to actually read the bands. With my poor color vision (and worsening *vision*), that would actually be useful!
    Another related app that I’d find handy would be a 5%/2%/1% decade chart, to find the closest available stock value. Corollary to that, a ratio calculator that picked the closest stock value pair…

  5. some other iphone apps that makers might find usefull

    SignalSuite adds precision signal generator capabilities to your iPhone or iPod touch.
    http://www.faberacoustical.com/products/iphone/signalsuite/

    SignalScope turns your iPhone into a powerful real-time spectrum analyzer and oscilloscope.
    http://www.faberacoustical.com/products/iphone/signalscope/

    for resistor calculation there is also “better”(faster to use) apps than the posted.

    iResist
    http://iresist.mosmokr.com/
    and
    Resistance calcultor
    http://www.iharwood.com/iPhone_and_iTouch_software/Resistance_v2.html

  6. as a computer engineering undergrad, i have taken 4 EE classes thus far… none of which have attempted to teach me the color coding. if i really need to figure it out, i just use the chart that is posted in all the labs. if that’s not available, web. if that’s not available, DMM… cuz that’s ALWAYS available.

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