Hi all, sorry for the dumb question, but I'm not finding any good info on the net it seems. I often see in old (CRT) TV chassis some resistors with a standard 4 bands code (the 4th is Gold) plus a 5th band always yellow, for example Brown Black Black Gold Yellow (measures 10 ohms as expected). What's the meaning of the additional yellow band? Thanks in advance Frank
I don't think yellow was an option on 5 band resistors, it was on 6 band where it was the temperature coefficient.
yellow is used in lieu of gold for tolerance - it's non-metallic.
NT
In which case why on earth would you have both? ("Lieu" implies substitution!)
Mike.
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** I have two 1W, MF resistors here,R1 = brown, black, gold, gold.
R2 = brown, black, back, silver, brown.
Can you say what their values and tolerances are ?
.... Phil
the resistors I'm talking about have both gold (as 4th band) and yellow as 5th band.
F1 ohm, 5%
1 ohm, 1%
Well, I guess the answer to my original question was probably a temperature tolerance band or something similar. Seems I am not alone.
Frank
Yes, obviously the presence of gold means it's not substituting for gold. This explains:
NT
The 3 first are the value (the last one is the multiplier).
Then, there is the tolerance.
And finally it can exist a 5th one, the thermal drift.
Too bad there is usually so little difference between yellow and gold as opposed to blue and gold or silver and gold.
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