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Last update:
Jan 2020 (68)

    

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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