The present invention concerns a process for preparing esteramide compounds. The power supply includes a converter transformer having primary and secondary windings loosely coupled to one another, and an auxiliary winding with a predetermined number of turns wound contiguously from one end of the primary winding to an end portion of the converter transformer. A slide member has a thumb tab that extends upwardly through the aperture that allows it to be slid back and forth between a position that indicates whether the door lock is locked or unlocked. A set of electrical contacts are disposed in proximity to the distal end to provide electrical contact to an inserted end of the implanted neurological lead.