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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