Abstract: An electronic ignition circuit for the self-destruction of a projectile fuse, including two condensers chargeable from a single generator, such as a piezoelectric cell. A delay circuit initiates the discharge of the first condenser through an igniter, with the generator raising the voltage of the first condenser to a level necessary for the igniter and that of the second condenser required for operation of the delay circuit.

Abstract: An electronic ignition circuit for the self-destruction of a projectile fuse, including a voltage source and a charging condenser determinative of the time interval until self-destruction. A threshold switch is responsive to a predetermined minimum voltage at the charging condenser for igniting an igniter, and an electronic control circuit is connected between the voltage source and the charging condenser.

Abstract: A safety device for an electrically operable projectile fuse in which a primer pin in the form of a firing pin is axially displaceable in the projectile while a detonator cap near one end of the primer pin is adapted to be ignited by impact of the primer pin thereon. A spring biases the primer pin away from the detonator cap while a propelling charge near the other end of the primer pin is electrically ignitable to drive the primer pin into impact with the detonator cap. The primer pin is latched in the projectile with the spring compressed and rotation of the projectile in flight will release the latch. When the primer pin is released it bridges a pair of contacts and completes a circuit from a piezo electric crystal through the propelling charge whereby the projectile will detonate upon impact by igniting the propelling charge and driving the primer pin into impact with the detonator cap. The detonator cap moves into registration with the primer pin in response to rotation of the projectile in flight.