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Electronic components and circuits in the data conversion field, 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 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/resolver angle indicators, synchro/resolver angle simulators, shaft angle encoders, data buses, fibre channel data buses utilising both copper and fibre 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 indentifying 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 controller motors and being formed or discrete components to form a solid block