Electronic components for data conversion, namely, electronic circuits, electronic synchro to digital converters, hybrid synchro and resolver converters, resolver to digital converters, digital to resolver converters, digital to synchro converters, hybrid thick film data converters, sample and hold amplifiers, track and hold amplifiers, sample and hold circuits, circuit overvoltage detectors, multiplexers, solid state control electrical transformers, solid state control differential transmitters, angle indicators, power supplies, sockets and connectors, track and hold circuits, programmable line drivers, solid state remote electrical power controllers, electronic depth indicators, shaft encoder angle indicators, synchro and resolver angle indicators, synchro and resolver angle simulators, and shaft angle encoders, data busses, fiber channel data busses utilizing both copper and fiber optics, air-cooled and conduction cooled electronic printed circuit boards, solid state remote power controllers, solid-state electronic hybrid circuits made up of two or more different monolithic integrated circuits, solid state electronic circuit modules immersed in a potting material to form a solid block, PCMCIA electronic circuits for insertion into a port of a personal computer to upload or download data, electronic solid-state encoder interface circuits, solid-state electronic position sensor interface circuits, solid-state circuits for interfacing electronic hardware in an aircraft to a data bus, electronic data bus analyzers for locating and identifying problems in a data bus, electronic data loaders for loading data into an aircraft, electronic multiplexers for combining data from a large number of inputs into one output, DC-DC converters for converting a DC input of a given level into a DC output of a different given level, electronic motor drive modules for controlling motors and being formed of discrete components to form a solid block