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Forum 141

Cap Colour Code

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crustytv
(@crustytv)
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Hi Guys,

Having a dilemma, tidying up some component draws I came across these caps. Now the trouble is reading the value.

One end is simple Gold 5% or silver 10%. What I'm having difficulty deciding on is reading the other end. Large splodge on end followed by two dots on the body. Is the splodge on the end the multiplier or the first value?

So do you read first dot, second dot followed by splodge end or splodge, dot dot with final dot being the multiplier?

eek_gifsteamy_gif

comp1.jpgcomp2.jpg

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Posted : 16/12/2016 5:02 pm
Cathovisor
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I think putting a few across a bridge would soon determine the value and thus the reading order - especially if you have one of Mr. Peak's finest smile

I'd hazard a guess at the ones marked yellow dot - violet dot - brown end are 470pF.

 
Posted : 16/12/2016 6:14 pm
crustytv
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Cathovisor said
I think putting a few across a bridge would soon determine the value and thus the reading order

If I had one working that would have been my first choice too.

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Posted : 16/12/2016 6:19 pm
Jayceebee
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Are you sure they're caps? I've not seen any like those before but I have seen chokes that look very similar in VCRs. Try one on ohms just to be sure.

John.

John.

 
Posted : 16/12/2016 6:35 pm
crustytv
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Hi John,

I bought an ex TV engineers workshop stock recently, all sorts of 70's period TV parts transistors, i.c's, diodes, thyristors caps and resistors which are all taking me an age to catalogue. I was rummaging through one of the cabinets I bought and found these in a tray, I thought caps but to be honest had not considered chokes. I will go and meter them after some tea.

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Posted : 16/12/2016 6:46 pm
crustytv
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These all meter out at 6Ω duno_gif

comp3.jpg

I was working with this in mind Brown splodge =1 Violet=7 Yellow=4, Gold end 5% so for a resistor 170K an inductor 170,00 uH and a cap .17uF but all that bears no semblance to the above reading.

If its a choke/inductor does the colour coding convention apply? Still confused!

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Posted : 16/12/2016 7:23 pm
Jayceebee
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I would suspect 470mH but I'm not sure.

John.

John.

 
Posted : 16/12/2016 7:32 pm
crustytv
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So if you're correct and you usually are, the read direction is reverse to what I thought, yellow, Violet, Brown with the large end splodge being the multiplier 4,7,1 =470

Just found another draw full and this time intermixed with inductors I do recognise, the little green fellas. Looks like mystery component solved. Just need to see if I can get my LCR meter working again then I can be sure-ish of the values.

comp4.jpg

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Posted : 16/12/2016 7:40 pm
Jayceebee
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Probably more likely to be 470μH.

 

Chris said
Hi John,

I bought an ex TV engineers workshop stock recently, all sorts of 70's period TV parts transistors, i.c's, diodes, thyristors caps and resistors which are all taking me an age to catalogue.  

Any 4000 series thick films by any chance? grin_gif

John
 

John.

 
Posted : 16/12/2016 7:57 pm
Nuvistor
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Have they been recovered from PCB's?

Frank

Frank

 
Posted : 16/12/2016 8:04 pm
crustytv
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Jayceebee said
Any 4000 series thick films by any chance? grin_gif

John
   

Wouldn't know them even if they were in front of having never seen one in the flesh. I do have all sorts of this film units scattered about in the workshop.

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Posted : 16/12/2016 8:34 pm
crustytv
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nuvistor said
Have they been recovered from PCB's?

Frank  

Hi Frank,

A mixture, some new, some recovered

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Posted : 16/12/2016 8:35 pm
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