A first energy generating system comprises a ferromagnetic generator coupled to a voltage controlled switch. The ferromagnetic generator includes a ferromagnetic element generating a magnetic field and positioned within a pulse generating coil and near an explosive charge. Detonation of the explosive charge decreases the magnetic field and induces a pulse of electric energy in the pulse generating coil. When the magnitude of the electric energy reaches a certain level, the voltage controlled switch closes. A second energy generating system comprises a flux compression generator coupled to a voltage controlled switch. The flux compression generator includes a inductance coil generating a magnetic field within a metallic armature that includes an explosive charge. Detonation of the explosive charge changes the magnetic field and induces a pulse of electric energy in the inductance coil. When the magnitude of the electric energy reaches a certain level, the voltage controlled switch closes.