Electronics (Mike Jaroch)
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The changing of direction of a wave as it leaves one medium and enters another medium of a different density  .
In a wave-transmission medium, the ratio between the phase velocity in free
space and in the medium  .
See FEEDBACK .
A detector circuit that produces its own oscillations, heterodynes them
with an incoming signal, and deflects them .
The process by which a portion of the output signal of an amplifying
device is fed back in phase to reinforce the input. Also called POSITIVE FEEDBACK  .
The section in a basic power supply that maintains the output of the power supply at a constant level in spite of large changes in load current or input line voltage  .
Bearing of a target measured in a clockwise direction from "dead ahead" of a
ship or plane .
An electromagnetic device with one or more sets of contacts that change position by the magnetic attraction of a coil to an armature .
A measure of the opposition that a material offers to magnetic lines of force .