Circuitry for a Remotely DimmablePortable Lighting Practical

Donald R. Youngberg


This article describes an electronic circuit that allows a battery-powered practical to be carried onto the stage, set down, and remotely switched to an external power source. Advantages of this circuit are the dimming and extinguishing of an unattended, battery-powered practical during or at the end of a scene.



The Silicon-Controlled Rectifier (SCR) in the circuit allows a lamp’s power source to be switched from an internal battery to an external source. The resistor and “on” switch supply and limit the threshold gate current that ...

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