Control device of the lighting system of at least two diag boars lamps

摘要

The lamps of two slide projectors are each supplied by the secondary winding of a transformer. Each secondary winding has a half- wave rectifier and a current-control element in series with its lamp. Terminals are provided for bridging the rectifier and current-control element to enable each projector to be used separately. The two secondary windings and rectifier can also be connected to form a full-wave rectifying unit with a median terminal feeding the two lamps each in series with its current-control element, to enable projection of a series of slides with simultaneous fading-in and fading-out of successive slides.