# colour code

Discussion in 'General Electronics Chat' started by jim blogs, Jul 10, 2014.

1. ### jim blogs Thread Starter New Member

Jul 10, 2014
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What value is a resistor: orange orange violet.

2. ### MikeML AAC Fanatic!

Oct 2, 2009
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I make it 33x10^7 or 330,000,000Ω or 330MegΩ

I have never seen a carbon or metal film resistor that high. I have a couple that go to about 22Meg. (red red green)

Are you sure it is a resistor?

Last edited: Jul 10, 2014
3. ### Dodgydave AAC Fanatic!

Jun 22, 2012
5,159
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other way round would be 73K,maybe its a cap ?

4. ### wayneh Expert

Sep 9, 2010
12,396
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A picture is worth a thousand words.

5. ### DerStrom8 Well-Known Member

Feb 20, 2011
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1,329
Here's a little app I wrote for people to learn the color codes.

These are the values to memorize:

Black = 0
Brown = 1
Red = 2
Orange = 3
Yellow = 4
Green = 5
Blue = 6
Violet = 7
Gray = 8
White = 9

Gold = 5% tolerance
Silver = 10% tolerance
None = 20% tolerance

The first two bands represent the value, the third band represents the multiplier (multiply the "value" of the first two bands by this number), and the last is the tolerance.

File size:
1.4 KB
Views:
41
6. ### jpanhalt AAC Fanatic!

Jan 18, 2008
5,699
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I find violet and brown hard to distinguish at times. Orange-orange-brown (330) is a much more reasonable value. That is why I test them.

John

7. ### DerStrom8 Well-Known Member

Feb 20, 2011
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1,329
Agreed. Once again, a photo would be very useful right now.

8. ### THE_RB AAC Fanatic!

Feb 11, 2008
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Double agreed! Ora,ora,brown is very common and I have seen tons of brown bands that looked violet, either from heat discolouring or just from iffy "brown" paint.

These days the colour bands are terrible colours, I'm not sure if it is the manufacturers cutting costs on "obsolete" through hole resistors or the modern trend to remove toxic paint pigments from use (wrecking all the good colours).

Probably a bit of both.