Circuit Symbols

  
 
 

    Circuit diagrams form the basis of all communicable electronic concepts and designs and an understanding of them is essential to gain an understanding of what they describe.  They form a language of their own with it's own rules of grammar and construction. Presented here is the basic vocabulary of that language, i.e. the symbols used to represent the components

    
                 
                 
A
Alternating Current Supply
(AC)		  
Amplifier		  
Aerial		      
B


Battery (or DC power supply)

  

Bell or Buzzer		          
  C
Capacitor (polarised)		  
Coil
(or inductor)		  
Capacitor
(variable)		      
  D
Diode		  
Diode
(zener)		  
Diode
(photodiode)		      
  E
 		              
  F                
  G
GND (Ground or 0v)		  
Galvanometer		          
  H                
  I                
  J                
  K                
  L
Lamp		  
LED (light emitting diode)		  
LDR (Light dependant resistor)		      
  M


Motor

  
Microphone		          
  N                
  O                
  P
Push Button		  
Potentiometer		          
  Q                
  R
Resistor		              
  S
Supply		  
Switch
single pole single throw
(SPST)		  
Switch
Single pole double throw
(SPDT)		      
   
Switch
Double Pole Single Throw
(DPST)		  
Switch
Double Pole Double Throw
(DPDT)		          
  T
Transformer		  
Transistor
(bipolar NPN)		  
Transistor
(bipolar PNP)		      
  U                
  V              
  W                
  X                
  Y                
  Z                
                   
                   
           
                   
 

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