Accession Number : ADD008338

Title :   Firing Circuit.

Descriptive Note : Patent,


Personal Author(s) : Hayman,Robert A

Report Date : 09 May 1978

Pagination or Media Count : 8

Abstract : The firing circuit comprises a direct current voltage source having negative and positive terminals connected, respectively, to first and second terminals of a firing network. The network comprises first and second resistors connected, respectively, to the first and second network terminals. A diode, a silicon controlled rectifire (SCR), an electrical detonator and a third resistor are connected in series with each other and in parallel with the first and second terminals, respectively, with the anode of the diode connected to the cathode of the SCR, and the gate of the SCR connected to the junction of the first and second resistors. A capacitor and a fourth resistor are connected in parallel with the combination of the SCR and the detonator. In a modification, a Zener diode is connected in parallel with the capacitor. The circuit is designed to be normally energized without firing the SCR and detonator, and to fire the SCR and detonator if: the voltage source is (1) suddenly disconnected from the network or (2) rapidly decreased; or (3) the input terminals of the network are short-circuited, or (4) too high a voltage is applied to the network. (Author)

Descriptors :   *Patents, *Firing circuits, *Detonators, Electrical properties, Direct current, Avalanche diodes, Firing tests(Ordnance), Silicon, Networks, Voltage, Input, Resistors, Sources, Terminals, Diodes

Subject Categories : Ammunition and Explosives

Distribution Statement : APPROVED FOR PUBLIC RELEASE