Help identify color coded resistors - Page 1
Forum section: electronics / repair

author: abdolah
author_rank: Regular Contributor
timestamp: July 27, 2024, 11:49:21 pm
content: Hi guys, this 5 band resistors are not measuring like they should , I'm not sure if they are not standard or faultyI even broke one of them and not the same valueThe values should be83 ohms14 ohms1.8 ohmsThey all measures sorted , zero ohmsIf you can held will be great , thank for your time

author: abdolah
author_rank: Regular Contributor
timestamp: July 27, 2024, 11:55:51 pm
content: More pictures

author: ledtester
author_rank: Super Contributor
timestamp: July 28, 2024, 12:16:14 am
content: I think you should ignore the green band.In the first pic you have:BROWN - YELLOW - SILVER - GOLD = 0.14R +/- 5%BLACK - BROWN - SILVER - GOLD = 0.01R +/- 5%

author: fzabkar
author_rank: Super Contributor
timestamp: July 28, 2024, 12:19:31 am
content: Quote from: abdolah on July 27, 2024, 11:49:21 pmI think they are probably inductors.

author: joeqsmith
author_rank: Super Contributor
timestamp: July 28, 2024, 12:28:19 am
content: Quote from: fzabkar on July 28, 2024, 12:19:31 amwere

author: wraper
author_rank: Unknown
timestamp: July 28, 2024, 12:45:47 am
content: Look like wirewound resistors. I agree with ignoring the green band. Some resistors have manufacturer specific band marking their type.

author: fzabkar
author_rank: Super Contributor
timestamp: July 28, 2024, 02:33:22 am
content: Quote from: wraper on July 28, 2024, 12:45:47 amQuote from: abdolahI think the OP means "shorted", in which case it doesn't make sense for them to be resistors.

author: wraper
author_rank: Unknown
timestamp: July 28, 2024, 07:42:45 am
content: Quote from: fzabkar on July 28, 2024, 02:33:22 amOP screwed up with color coding and destroyed a good resistor. So fraction of an Ohm resistors do not exist?

author: Wallace Gasiewicz
author_rank: Super Contributor
timestamp: July 28, 2024, 11:25:57 am
content: The "exploded view" indicates two windings. So. probably a wire wound resistor with two opposite windings to negate the inductance of one winding? Last band Green could mean .5% tolerance.Small Value, accurate resistors.It would be nice if the OP could comment on the equipment these parts were from.

author: fzabkar
author_rank: Super Contributor
timestamp: July 28, 2024, 12:52:49 pm
content: Quote from: wraper on July 28, 2024, 07:42:45 amYeah, I goofed. Sorry.

author: abdolah
author_rank: Regular Contributor
timestamp: August 03, 2024, 03:09:03 pm
content: Thanks for the replyThe resistors are from PC PSU , brand EVGA , model nex650G

author: abdolah
author_rank: Regular Contributor
timestamp: August 03, 2024, 08:22:35 pm
content: You mean gray not silver, because silver is only for toleranceSo what about the resistor that start with gray?

author: Wallace Gasiewicz
author_rank: Super Contributor
timestamp: August 05, 2024, 12:31:49 pm
content: I do not recall seeing any resistors with a Black first band,,,,apparently there are some , but you never know what colors change over timeI would use this calculator from Mouser:https://www.mouser.com/technical-resources/conversion-calculators/resistor-color-code-calculator/If the values are very low, your ohmeter may not give you a correct value...I do not know what meter you are using..also the "exploded view" indicates a small value wire wound resistor....I would think any inductor (choke) in a power supply would have many more windings.Almost always both wire wound resistors and chokes fail "Open" not shorted.Edit: silver can also be a multiplier

author: abdolah
author_rank: Regular Contributor
timestamp: August 06, 2024, 07:38:57 pm
content: I tried the calculator and it gave me the same that they should but not what they measure as , also I don't know why one of the resistors start with silver , you might say it's gray but it looks like silver , I'm so confused about should I replace them or not and with what?

author: Wallace Gasiewicz
author_rank: Super Contributor
timestamp: August 07, 2024, 12:44:25 pm
content: Yes, it does look like silver....Confusing

author: magic
author_rank: Super Contributor
timestamp: August 07, 2024, 03:55:41 pm
content: Maybe there is a manufacturer somewhere who marks 3.3mΩ like that. I don't know.Anyway, these are all low resistance wirewound resistors so no surprise they measure close to zero. IIRC I have seen similar resistors used in other ATX PSUs as current sense resistors in series with switching FETs.

author: ledtester
author_rank: Super Contributor
timestamp: August 07, 2024, 05:05:57 pm
content: I have a feeling the green band indicates wattage, eg. green = 5W.

author: abdolah
author_rank: Regular Contributor
timestamp: August 08, 2024, 02:43:56 am
content: Yeah , I think I will but them back and will replace the one that I sacrificed , but it's still a Mistry,Anyway thank you all for helping in this discussion and for your time