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Old 5th Jul 2010, 12:48 pm   #1
'LIVEWIRE?'
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Default 5 Band resistor Colour Code

Can someone refresh my memory as to this. I know that the 1st colour is 1st figure, 2nd C. is 2nd Fig., 3rd is multiplier, all using the conventional colour codes with which we are all familiar. My question concerns the last two bands, one of which is tolerance, what is the other, and which is which?
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Old 5th Jul 2010, 1:15 pm   #2
Tim
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Default Re: 5 Band resistor Colour Code

ISTR it is Temerature co-efficient. But as to which way round they are, haven't a clue.
Anything with more than four bands I check with a DVM.................

Then there are those ones with a total of six (FOUR bands for the value), which I have never got to grips with, never knowing which end to start!
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Old 5th Jul 2010, 1:20 pm   #3
AlanBeckett
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Default Re: 5 Band resistor Colour Code

See attached.
Google resistor colour code and you'll get lots of pretty ones

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Old 5th Jul 2010, 1:23 pm   #4
threeseven
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Default Re: 5 Band resistor Colour Code

It's for tight tolerance with a temp coefficient.

See this :-

http://en.wikipedia.org/wiki/Resistor_color_code
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Old 5th Jul 2010, 2:06 pm   #5
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Default Re: 5 Band resistor Colour Code

However a lot of modern resistors are marked: Band 1 first figure, Band 2 second figure, band 3 THIRD FIGURE!, band 4 number of zeros, band 5 tolerance (usually 1%, occasionally 2% for these 3-figure codes). And that makes 5 bands! So 1k 1% is marked, brown, black, black, black, brown, brown.
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Old 5th Jul 2010, 2:13 pm   #6
Tim
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Default Re: 5 Band resistor Colour Code

Quote:
never knowing which end to start!
Be Ok with 1.1 k I suppose.
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Old 5th Jul 2010, 5:05 pm   #7
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Default Re: 5 Band resistor Colour Code

But not so good when you get a batch of boards with 120R 1% fitted instead of 10K 1%. BTDT
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Old 5th Jul 2010, 7:17 pm   #8
'LIVEWIRE?'
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Default Re: 5 Band resistor Colour Code

My question arose due to what I thought was an o/c 47K resistor in a Marantz amplifier-this resistor being marked Yellow, Mauve, Brown, Red(or Orange), & Silver.
On checking the circuit diagram it turned out that this resistor is 47 OHMS(as per the first 3 colours) The Silver band = +/- 10% tolerance, but I'm still not sure what the red(?Orange?) band indicates.
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Old 5th Jul 2010, 7:20 pm   #9
ppppenguin
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Default Re: 5 Band resistor Colour Code

Yellow 4
Violet 7
Brown 1

Gold x0.1

Silver 10%

Hence 47.1R, 10%

Very odd having 10% tolerance on a resistor specified to 3 significant digits.
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Old 5th Jul 2010, 8:03 pm   #10
John M0GLN
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Default Re: 5 Band resistor Colour Code

High stability resistors used to have a pink band as the last one.

John
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Old 5th Jul 2010, 10:22 pm   #11
McMurdo
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Default Re: 5 Band resistor Colour Code

Mm that resistor colour code compared to its value doesnt make sense whichever way you read it.
Modern equipment never uses 10% resistors, minimum is 5 and usually 2%
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Old 6th Jul 2010, 7:41 pm   #12
theoldtrout
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Default Re: 5 Band resistor Colour Code

You may find this free programme useful. I've used it as a teaching aid.

http://myfreewares.weebly.com/resist...de-solver.html
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Old 6th Jul 2010, 8:58 pm   #13
Tim
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Default Re: 5 Band resistor Colour Code

Quote:
You may find this free programme useful. I've used it as a teaching aid.
Looks fab
Thanks for that one.
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