Diodes



  A selection of 5mm LEDs.
  The LED on the left is a red/green bicolour LED.
  The LED between the yellow and green is an infra-red LED.




A point contact Germanium diode - OA91.    
Useful for rectifying radio signals because of its low forward voltage.    




  A close up of a LED.
 




Two examples of bridge rectifiers.    
Useful for rectifying the output of a transformer.    




  A metal rectifier.
  Note the fins to dissipate the heat generated.




Power diodes 1N5401 and 1N4001 with a 5V1 zener diode.    



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