The heck is this?!? - Page 1
Forum section: electronics / beginners

author: GadgetBoy
author_rank: Regular Contributor
timestamp: October 20, 2018, 12:34:15 am
content: Pinkish resistor with red, red, gold, gold, white (or vice versa - doesn't make sense either way).Any thoughts?Sent from my ONEPLUS A3000 using Tapatalk

author: Housedad
author_rank: Frequent Contributor
timestamp: October 20, 2018, 01:03:09 am
content: I ddon't know a lot, but my best first guess would be some kind of old axial lead capacitor. Paper wound. But the board says R10. Makes no sense.If you have a ESR meter you may want to try it and then see what the DC resistance (and continuity) of the part to help find out.What is this in?

author: tooki
author_rank: Super Contributor
timestamp: October 20, 2018, 01:10:55 am
content: I think the pink denotes a fusible resistor. (As in, not all fusible resistors are pink, but if a resistorispink, there's a decent chance it's fusible.)

author: floobydust
author_rank: Super Contributor
timestamp: October 20, 2018, 01:15:29 am
content: The first four bands are the usual IEC: red red gold gold = 2 2 x0.1 ±5% gives 2R2 ±5%.The fifth band is open season, unfortunately (resistor) manufacturer specific.These have a safety function because they burn up when something else fails short circuit.It would be a flame-proof fusible resistor. But I am not sure who made it, i.e. Yageo, KOA, Welwyn, TT, Futaba etc.Fifth band:White: fusibleGold: miniature fusible (usually with pink body)Yellow: "constant voltage fusibility"Black: sometimes wirewound fusible resistor, but I see film types tooViolet: Vishay NFR25HSome series use coloured fifth band to denote fusibility overload rating (4x,8x,64x).

author: xrunner
author_rank: Super Contributor
timestamp: October 20, 2018, 01:26:08 am
content: Or use the brute force method - unsolder one end and get to it with a DMM ...

author: Housedad
author_rank: Frequent Contributor
timestamp: October 20, 2018, 01:27:17 am
content: Oh, I see what you mean. The 5th white band is confusing, leading to believe it is a 5 band when it is only meaningful to the manufacturer and not standard code?So a 4 band with a junk band at the end. Sounds like a bad concert.I'll always call them "bad concert" resistors after this.

author: drussell
author_rank: Super Contributor
timestamp: October 20, 2018, 02:06:40 am
content: Various manufacturers use the lacquer color on the body to denote different series / material technology but there is no industry standard. Ditto for things like that fifth band, it often denotes special series or characteristics / options. You would need to know the manufacturer to be able to decypher a particular code with absolute accuracy.For example, YaegoFKNandPNPseries both have green bodies, in this case denotingWirewoundconstruction. ThePNPseries has a violet 5th band, denoting "High Power, Ultra Miniature" type while theFKNseries has a white 5th band, denoting "Fusible & Flame Proof, Normal and Mini." In the case of theFMPseries, the pink body denotesMetal Filmconstruction, etc. etc.There are a virtually limitless number of permutations and combinations even among the various series available from a given manufacturer. For example, in addition to the note "The resistors are coated with layers of green color flame-proof lacquer," theFKNseries datasheet shows:Datasheets:Yaego FKN series,Yaego PNP series,Yaego FMP series

author: T3sl4co1l
author_rank: Super Contributor
timestamp: October 20, 2018, 03:39:15 pm
content: Other evidence aside, it's placed suspiciously close to -- probably in series with, a quick look at the solder side will prove this -- an AC line, which if that's mains, and there's no fuse in sight... doing double duty for inrush limiting and fusing is not at all a bad guess.Tim