Control circuit for sound slide protection - has programmed slide cycle with sound track stopped at end of commentary

摘要

The control circuit for a sound track linked slide projector has the slide sequence linked to a minimum projection timer (8) while the sound track is stopped as soon as each commentary is complete. For long commentaries, the slide change sequence is initiated by the stop signal at the end of the commentary. The system optimises the sound tape use. Only minimum gaps are generated between commentaries and no other control is required for the slide cycle. A repeat button is available which reverses one cycle and repeats a particular slide and commentary.