Strange resistor color codes

Davide82 · 17th January 2009, 08:41 AM

Hi,

I opened an old CD player and came across these strange resistors which have 5 color bands:

white-gold-gold-blue(violet?)-green
on light green background.
(black circled on image)

They just don't make sense, do they?

By the way I found all the diodes of the bridge bypassed with 22 nF ceramics: I believed this solution was only typical of DIYers! (red circled)

Geek · 17th January 2009, 09:03 AM

They are probably inductors.

http://www.elexp.com/t_induct.htm

Cheers!

raindog · 17th January 2009, 09:04 AM

Hi,

Indeed very strange ( gold is usualy used to indicate 5% tolerance ); I guess the simplest way to determine the value in this case is to take one out and measure it . By the way bypassing rectifier diodes it's common practice in electronic equipement ( DIY didn't invent electronics , we just try to use the best technical solutions available )

Davide82 · 17th January 2009, 09:05 AM

Hmmm, sounds strange because they are marked Rxxx on the PCB...

BTW they get quite hot while the cd player keeps seeking (in fact they are a bit elevated from the pcb)

Geek · 17th January 2009, 09:06 AM

Quote:

Originally posted by Davide82
Hmmm, sounds strange because they are marked Rxxx on the PCB...

OK, then they are low ohm resistors, probably military types.

I couldn't see the designation from the pic.

Cheers!

Big_Valven · 17th January 2009, 09:46 AM

Could they be small value inductors?

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17th January 2009, 09:03 AM	#2
Geek diyAudio Member Join Date: Sep 2004	They are probably inductors. http://www.elexp.com/t_induct.htm Cheers!

17th January 2009, 09:04 AM	#3
raindog diyAudio Member Join Date: May 2003 Location: Timisoara	Hi, Indeed very strange ( gold is usualy used to indicate 5% tolerance ); I guess the simplest way to determine the value in this case is to take one out and measure it . By the way bypassing rectifier diodes it's common practice in electronic equipement ( DIY didn't invent electronics , we just try to use the best technical solutions available )

17th January 2009, 09:05 AM	#4
Davide82 diyAudio Member Join Date: Dec 2003 Location: xxxxx	Hmmm, sounds strange because they are marked Rxxx on the PCB... BTW they get quite hot while the cd player keeps seeking (in fact they are a bit elevated from the pcb)

17th January 2009, 09:46 AM	#6
Big_Valven diyAudio Member Join Date: Dec 2007	Could they be small value inductors?

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