Delay circuit for use in electric blasting system

Details Delay circuit for use in electric blasting system Delay circuit for use in electric blasting system

F - Mech Eng,Light,Heat,Weapons

23

Q

342/47

F23Q 21/00 (2006.01) F42D 1/055 (2006.01)

Patent

CA 1326281

DELAY CIRCUIT FOR USE IN ELECTRIC BLASTING SYSTEM Abstract of the Disclosure A delay circuit for use in an electric blasting system including a capacitor for storing electric energy supplied from an electric blaster, an actuation circuit for detecting the stop of voltage supply from the blaster to generate an actuation signal, a circuit for generating clock pulses, a circuit for counting a predetermined number of clock pulses in response to the actuation signal to generate an igniting signal, and a switching circuit for responding to the igniting signal to discharge the electric energy stored in the capacitor through an igniting resistor, the actuation circuit having a zener diode with a threshold voltage. When the voltage supply from the blaster is stopped and the voltage across the zener diode becomes lower than the threshold voltage, the zener diode is cut-off to generate the actuation signal.

591104

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