Two Simple LED Circuits

Tom Neville


Though LEDs (light-emitting diodes) are commonly used as everything from panel indicator lamps to the tiny flashers on sun visors, many technicians continue to find them somewhat mysterious. This article describing two simple LED circuits should remove some of that mystery and hint at the broad range of possible theatrical applications.

The constant-on LED circuit represented in Figures 1 and 2 could be used in place of a standard 120V cuelight system, freeing up house circuits for other uses. Similarly, it could be used to provide necessary escape-platform lighting or to replace glow tape in some other applications.

The flashing-LED circuit depicted in Figure 3 might be used to indicate the location ...

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