Miscellaneous



  Circuit diagram of a 555 timer IC.




A punched card.    
Used for computer data entry in the 1970s.    




  An old security device used in shops.
  The cover has been removed.




2KB EPROM.    




  The filament from a fluorescent tube.
  Note that the filament is coiled coil.




A RFID tag used for tracking goods.    




  A security tag from a DVD.
  Note the coil and capacitor form a tuned circuit.
  The spacing of the capacitor leads is 0.1".




A Digital Light processor.    
Each mirror is 16µm square and is 1µm from its neighbour.    




  Electric shock (www.twothirtyvolts.org.uk).




Magnetron from a microwave cooker.    




  Replica of the first magnetron.
  Birmingham University.




The erase head from a reel to reel tape recorder.    
Note the tiny gap between the two poles of the electromagnet.    




  Tesla coil sparks.



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