One of the mysteries of the English language finally explained.
A pulse-generating circuit in which a brief triggering pulse produces at one electrode a longer pulse whose duration is proportional to an applied control voltage, and at another electrode a linear sweep voltage of the same duration (which can then be used to generate another pulse that will occur at a definite interval after the triggering pulse).
1940s; earliest use found in untitled. From phantas- + -tron.
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