Circuit for eliminating contact bounce effect

Claim 1

Means for protecting pulse responsive circuits from multiple output signals caused by the bounce of mechanically operated switching contacts, comprising: a gain producing device comprising an amplifier including, an input alternately connectable through mechanically operable switching contacts to a source of signals of a first characteristic, and a source of signals of a second characteristic, and an output connectable to a pulse responsive circuit, said gain device initially operated in response to connection through said contacts to said source of signals of said first characteristic, to produce at said output a single signal of said first characteristic, and further operated in response to connection through said contacts to said source of signals of said second characteristic to produce at said output a single signal of said second characteristic; and a feedback circuit connected from the output to the input of said gain device, said feedback path maintaining said gain device operated to continue production of a single signal at said output of said gain device, of the same characteristic as that of the signal source last connected to said gain device input.