Real-time demonstration of electronic circuit operation

Real-time classroom demonstrations that have been developed for use in a three-day short course on solid-state electronics are described. The techniques are used to illustrate transistor, op-amp circuit, and transducer operation. Working schematics are projected by an overhead transparency projector. As component values are changed or an oscilloscope probe is moved from node to node, cause and effect are easily observed. Large-screen display of the DC results of the demonstrations is shown with a projection analog meter or digital volt meter. The AC waveforms are displayed with a digitizing oscilloscope that produces a composite video signal that can be easily shown with a television or monitor