NASA NTRS · 19650000131
Simple circuit positions film frames in projector
Abstract
Individual frames on a photographic film strip in a projector are automatically positioned by a simple circuit. The circuit uses a photodiode that senses frame registry position and a relay that stops the film-advance motor to suspend the film at point of registry.
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Silver, R. H.. 1965-05-01. Simple circuit positions film frames in projector. https://ntrs.nasa.gov/citations/19650000131
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