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A low band pass transformer was developed which provides protection for weapon electro-explosive devices (EED) in a-c firing circuits against spurious induced energies from electro-magnetic and electro-static fields. The transformer is designed to operate from an excitation of 45 watts for a period of 1.0 millisecond, minimum, over the pass band frequency range of 100 cycles per second to 10 kilocycles per second; at 28 volts 400 cps it delivers a minimum of 11.3 watts (6 db) to a one ohm resistive load. It is capable of dissipating continously 10 watts of incident power over the stop band frequency of 100 kilocycles per second to 10 kilomegacycles per second and has a power attenuation of 40 db minimum above 100 kilocycles per second into a one ohm resistive load. The unit is cylindrical, 1.38 inches in diameter and 2.0 inches long excluding connectors, and weighs 182g (.4 lbs.). (Author)