Disabling circuit having a predetermined disabling interval

Claim 1

A signal disabling circuit coupled between a signal source and a utilization device comprising: an integrator circuit comprising a parallel connected resistor capacitor combination connected to said source; a threshold sensing circuit comprising a zener diode in series with a first transistor connected to said integrator for providing a trigger signal when said integrator circuit reaches a predetermined threshold value, said predetermined voltage determined by the breakdown voltages of said zener diode and said first transistor; a monostable multivibrator coupled to said threshold sensing circuit comprising a second transistor rendered conductive upon receipt of said trigger signal, a third transistor rendered conductive when said second transistor is rendered conductive, a field effect transistor, and a capacitor shunted across said field effect transistor, said capacitor charging when said second transistor and said third transistor are rendered conductive, said capacitor rapidly discharging through said field effect transistor when said second transistor and said third transistor are rendered nonconductive thereby enabling quick retriggering of said multivibrator, said second transistor and said third transistor drawing no power in their OFF mode, and a signal inhibitor circuit including a feedback path and a fourth transistor in parallel with said integrator coupled between the output of said multivibrator and the input of said integrator for precluding the transfer of signals for a predetermined time from said source to said utilization device through said disabling circuit; said utilization device coupled to the output of said multivibrator.