Definition of phantastron in US English:

phantastron

noun

Electronics
  • 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).

Origin

1940s; earliest use found in untitled. From phantas- + -tron.