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Author Topic: Resistor colour codes  (Read 543 times)

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Offline Railwaygun

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Resistor colour codes
« on: December 09, 2019, 03:42:42 PM »
For the electrically challenged
This has been a public service announcement
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Offline Nigel Cliffe

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Re: Resistor colour codes
« Reply #1 on: December 09, 2019, 04:33:24 PM »
Or, just use a Digital Multimeter's resistance scale to read the value from the component before use.   

I have a couple of meters on the bench.  I have two because they were "two for £5".   Prices have gone up a little since I bought them, so perhaps "two for £10". 



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Re: Resistor colour codes
« Reply #2 on: December 09, 2019, 04:47:22 PM »
Handy mnemonic for colour code for 0-9
   0     1        2             3          4      5        6        7       8       9
Billy   Brown revives     on      your    gin    but  prefers good  whiskey
Black Brown   Red    Orange  yellow Green Blue Purple   Grey  White

For tolerance Gold = 5%  Silver 10%  unmarked 20% 
(A few better tolerance ones may have 1%-4% by the above colour code.)

( there is also a rude version)

Cheers MIKE
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Offline ntpntpntp

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Re: Resistor colour codes
« Reply #3 on: December 09, 2019, 04:51:22 PM »
I reckon I know the colour codes fairly well as I've been putting circuits together since I was a young lad in the 70s, but yes I do check with a multimeter   :D   

With all the strips of resistors I buy I write the value on the strip, and organize in trays so that for example 56R, 560R, 5k6, 56k, 560k etc. strips all go in the same tray.
Nick.   2016 celebrating the 20th anniversary of "Königshafen" exhibition layout!

Online chrism

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Re: Resistor colour codes
« Reply #4 on: December 09, 2019, 04:53:39 PM »
Handy mnemonic for colour code for 0-9
   0     1        2             3          4      5        6        7       8       9
Billy   Brown revives     on      your    gin    but  prefers good  whiskey
Black Brown   Red    Orange  yellow Green Blue Purple   Grey  White

For tolerance Gold = 5%  Silver 10%  unmarked 20% 
(A few better tolerance ones may have 1%-4% by the above colour code.)

( there is also a rude version)

I only know the rude version   :-[

Mind you, it only works if 7 is given its correct colour name  :P

Offline ShakyZZR

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Re: Resistor colour codes
« Reply #5 on: December 09, 2019, 05:22:33 PM »
( there is also a rude version)

I only know the rude version   :-[

Mind you, it only works if 7 is given its correct colour name  :P

Yes, I remember being at Otley BT training school in the early eighties and getting told the rude version. If it was repeated anywhere nowadays you'd have the coppers knocking at your door  :sorrysign:
I am Homer of Borg. resistance is............hmmmmm doughnuts.

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Re: Resistor colour codes
« Reply #6 on: December 09, 2019, 05:37:36 PM »
Quote
Mind you, it only works if 7 is given its correct colour name 

Purple/violet  so in the polite version substitute prefers for values it still works.
Cheers MIKE
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Offline Ditape

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Re: Resistor colour codes
« Reply #7 on: December 09, 2019, 05:44:16 PM »
I too was taught the :censored: non PC version using Violet not purple back in the early 70's at Artificer training in the RN.

 :censored: Boys  :censored: our young girls but   :censored: go without.
Diane Tape



Offline gawain

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Re: Resistor colour codes
« Reply #8 on: December 09, 2019, 06:27:25 PM »
The version I was taught at Civilian Tech School RAF Sealand replaced Boys with B:censored:ds.

Offline ShakyZZR

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Re: Resistor colour codes
« Reply #9 on: December 09, 2019, 08:06:08 PM »
The version I was taught at Civilian Tech School RAF Sealand replaced Boys with B:censored:ds.

Same 'ere  :goggleeyes:
I am Homer of Borg. resistance is............hmmmmm doughnuts.

Offline Lawrence

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Re: Resistor colour codes
« Reply #11 on: December 09, 2019, 11:31:32 PM »
I have never bothered with colour codes and my job is in electronics manufacturing.

Once everything went surface mount, the colour codes went away. Once you've got 0201 parts on a board it all becomes moot  :D

Regards,

John P
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Offline The Q

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Re: Resistor colour codes
« Reply #12 on: December 10, 2019, 07:46:53 AM »
The common "naughty" version above was that told at RAF Locking No1 Radio School. (along with a formal "nice" version).

We still have stuff coming in for service and repair that was built with conventional resistors, and often early prototypes are built with conventional resistors. But almost all our production stuff is surface mount now..

Must get back to work.. measuring the zero Ohms resistance of a calibrator at the moment. It should be about,  0.000 023 and a little bit Ohms. That value is taken into account when calibrating the Zero on Multimeters.

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Re: Resistor colour codes
« Reply #13 on: December 10, 2019, 08:08:27 AM »
Must get back to work.. measuring the zero Ohms resistance of a calibrator at the moment. It should be about,  0.000 023 and a little bit Ohms.

That accurate, eh?
What if the "little bit" is too little or too not little?
 :D

Offline The Q

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Re: Resistor colour codes
« Reply #14 on: December 10, 2019, 08:24:02 AM »
Must get back to work.. measuring the zero Ohms resistance of a calibrator at the moment. It should be about,  0.000 023 and a little bit Ohms.

That accurate, eh?
What if the "little bit" is too little or too not little?
 :D
Less would be better and probably on a new Calibrator which therefore has new relays in it. Most of the figure is made up of relay contact resistance and PCB to connector resistance.
If it strays too high then a relay change is normally the first point of attack..

I've now measured the lead resistance 0.000,001,8 Ohms and am waiting for the measured resistance of the calibrator Zero, take the above from the next measurement and I have the result.

After that I have left to measure, 10K Ohms Down to 1 Ohms with similar accuracy, each value is measure 20 times, 10 forward current, 10 reverse Current. With intermediate measurements thats 200 measurements to go and that will be this calibrator finished except for putting a reference DMM on it to check the correction file is correct..

In all a calibrator of this type takes 2 man days of work..

Initial results look like it being about 0.000,021,9 Ohms
« Last Edit: December 10, 2019, 08:29:53 AM by The Q »

 

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