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POLARITY GUARD

  • US 3,819,951 A
  • Filed: 12/27/1972
  • Issued: 06/25/1974
  • Est. Priority Date: 11/28/1972
  • Status: Expired due to Term
First Claim
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1. A polarity guard having first and second input terminals for connection to a potential supply, and first and second output terminals for connection across a load, said pOlarity guard characterized by first, second, third and fourth transistors, said first and second transistors being of one conductivity type, and said third and fourth transistors being of another conductivity type, the control electrodes of said first and fourth transistors being connected via first and fourth resistors respectively to said first input terminal and the control electrodes of said second and third transistors being connected via second and third resistors respectively to said second input terminal, said first input terminal being connected through said second transistors to said second output terminal and through said third transistors to said first output terminal and said second input terminal being connected through said first transistor to said second output terminal and through said fourth transistor to said first output terminal.

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