Methods and apparatus for controlling slide projectors

Details Methods and apparatus for controlling slide projectors Methods and apparatus for controlling slide projectors

H - Electricity

05

B

315/11, 88/46

H05B 37/02 (2006.01) G03B 23/00 (2006.01) H05B 39/08 (2006.01)

Patent

CA 1043855

A B S T R A C T The invention uses frequency control of lamps and magazines in projectors and is especially adapted for programmed control by recording the frequency signals produced by previous rehearsal of the programme under manual control. The circuit was an integrated voltage from the frequency signal to control threehold devices operating triggered switches controlling supply to the lamps, and to actuate a magazine control; a saw tooth signal being used as the basic timing signal in operating the lamps.

201233

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