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soundforger
Joined: Jun 24, 2011
Posts: 9
Location: The Netherlands
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 Posted: Wed Jan 25, 2012 12:06 pm Post subject:
Tempco colorcode
Subject description: How do I read the colored rings on tempcos? |
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I can't seem to make sense of the colored rings on the tempcos I bought.
The colors I can distinguish are orange, orange, red, green, red (or the other way around)
I can't find a resistor colorcode calculator that gives a value that comes close to 2K ohm, 1/4 Watt, 2% tolerance, 3500 ppm (which they should be). There are several on the web, but I can't come close and the maximum tc value is 100ppm.
Does anyone know of any colorcode calculator that I can use? I have several other resistors with 5 rings that I'd like to check. |
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EdisonRex
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EdisonRex
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| Posted: Wed Jan 25, 2012 12:55 pm Post subject:
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Although that calculator is off by a decade on my resistors O_o
I think what I have reads as 2.0k 3k 0.5%
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soundforger
Joined: Jun 24, 2011
Posts: 9
Location: The Netherlands
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| Posted: Wed Jan 25, 2012 1:44 pm Post subject:
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So mine may read red, black, red, orange, orange?
Can I be mistaking orange for yellow? Or maybe brown? The tube color is light blue.
And what about the TC?
BTW, thanks for the quick response! |
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EdisonRex
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| Posted: Wed Jan 25, 2012 2:02 pm Post subject:
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My eyes have a hard time reading those little things nowadays. I use a very bright white LED to shine onto it which helps see the colours.
Orange as the last band would mean 3% tolerance... Brown, 1%.
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EdisonRex
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| Posted: Wed Jan 25, 2012 2:05 pm Post subject:
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aha. Right, orange-green = 35 or 3500. That makes more sense. Mine are supposed to be 2k 3500ppm.
So read the first 3 as the resistor value and the last two as the TC value.
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EdisonRex
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| Posted: Wed Jan 25, 2012 2:07 pm Post subject:
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orange, orange = 3300
Maybe I just needed to eat dinner before I posted!
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defog
Joined: Aug 24, 2011
Posts: 47
Location: Philadelphia
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| Posted: Wed Jan 25, 2012 2:21 pm Post subject:
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| EdisonRex wrote: | My eyes have a hard time reading those little things nowadays. I use a very bright white LED to shine onto it which helps see the colours.
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Be lucky you're not color blind Edison, I have to use a damn meter on every resistor I use! 
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soundforger
Joined: Jun 24, 2011
Posts: 9
Location: The Netherlands
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| Posted: Wed Jan 25, 2012 2:22 pm Post subject:
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O.k., thanks!
Now I know how to read the little buggers!
Using the bright white led is a good idea, since my eyes are 50 years + old. |
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EdisonRex
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| Posted: Wed Jan 25, 2012 2:52 pm Post subject:
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| defog wrote: | | EdisonRex wrote: | My eyes have a hard time reading those little things nowadays. I use a very bright white LED to shine onto it which helps see the colours.
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Be lucky you're not color blind Edison, I have to use a damn meter on every resistor I use! |
I may not be color blind (and I do think I am lucky) but I'm getting more nearsighted. And at night my eyes love the dark but it doesn't help see anything, if you know what I mean. I think looking at LCD monitors for 10+ hours a day isn't helping.
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defog
Joined: Aug 24, 2011
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Location: Philadelphia
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| Posted: Wed Jan 25, 2012 5:41 pm Post subject:
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| EdisonRex wrote: | | defog wrote: | | EdisonRex wrote: | My eyes have a hard time reading those little things nowadays. I use a very bright white LED to shine onto it which helps see the colours.
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Be lucky you're not color blind Edison, I have to use a damn meter on every resistor I use! |
I may not be color blind (and I do think I am lucky) but I'm getting more nearsighted. And at night my eyes love the dark but it doesn't help see anything, if you know what I mean. I think looking at LCD monitors for 10+ hours a day isn't helping. |
We'd be wise to buy stock in vision correction technology and orthopedic procedure tech. That's going to be a hot ticket in a few more years. There will probably even be a prescription medicine for "phone hand syndrome" and "Display distress syndrome".
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