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Last update:
Oct 31/16 (65)

    

Identifying Resistor and Capacitor Values
  

Most people learn the resistor color code without too much difficulty.  But the capacitor numbering system can be really confusing.  This can be a pain for kit builders:  if you have a parts list that specifies some capacitor values as being 100nF, and kit parts are marked "101" and "104", which one (if any) is 100nF?  

There are a number of good references for resistors and capacitors on the 'net (see below), so I'm not going to reinvent the wheel. I will just present the basic resistor color code as a refresher, and an example capacitor table to help translate the id numbers on small capacitors into their real capacitance values.   

Resistor Color Code  
     
  Bands 

Color 

Sig. Digits 
(1 & 2)
Multiplier 
(3)
Tolerance 
(4)
Black     
Brown    10   
Red    100   
Orange    1000   
Yellow    10,000   
Green    100,000   
Blue    1,000,000   
Violet       
Gray       
 White       
 Gold          5% 
Silver          10% 
 None          20% 

 

  

           

Capacitor Number Code 

1 F = 1,000,000 uF          1 uF = 1000 nF            1 nF = 1000 pF  
  
ID #    Value    ID #    Value   ID #    Value  
105    1 uF = 1000 nF  475    4.7 uF  685    6.8 uF 
104    0.1 uF = 100 nF  474    0.47 uF = 470 nF  684    0.68 uF = 680 nF 
103    0.01 uF = 10 nF  473    0.047 uF = 47 nF  683    0.068 uF = 68 nF 
102    0.001 uF = 1 nF  472    0.0047 uF = 4.7 nF  682    0.0068 uF = 6.8 nF 
101    0.0001 uF = 100 pF  471    0.00047 uF = 470 pF  681    0.00068 uF = 680 pF 

  

Useful Links for kit builders...  
http://www.kpsec.freeuk.com/components/capac.htm    
http://www.kpsec.freeuk.com/components/resist.htm  
http://www.play-hookey.com/dc_theory/capacitor_values.html   
http://www.play-hookey.com/dc_theory/color_code.html  
http://www.uoguelph.ca/~antoon/gadgets/caps/caps.html   
http://www.uoguelph.ca/~antoon/gadgets/resistors/resistor.htm      
http://www.aaroncake.net/electronics/solder.htm   
http://www.instructables.com/id/How-to-solder   
http://www.epemag.wimborne.co.uk/solderfaq.htm#howto   
http://www.kpsec.freeuk.com/solder.htm   
  
  

 

    

    

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