Electrical timing arrangements and methods.

摘要

A circuit arrangement for electrically firing a load 10, such as the rocket motor of a projectile, at a predetermined time after it has been ejected from a predetermined path (such as the barrel of a gun) comprises a capacitor 26 which is charged up through bore-rider contacts 12 sensing ejection of the projectile, a resistor 27, and diodes 28 and 30. A diode 32 blocks a capacitor discharge path in which the load 10 is connected. Closure of contacts 12 initiates two timer 20 and 20A. These are of different type, so as to minimize the risk of double failure, and have the same predetermined time period. At the end of this period, they respectively close switches 24 and 24A thus abruptly shifting the potential on the positive plate of capacitor 26 to zero. Diode 32 is now unblocked and discharge current passes through the load and fires it.