Document Type and Number:
Japanese Patent JPS5121781
Kind Code:
B2
Abstract:
The electric circuit for energizing and deenergizing an exciter lamp of a talkie projector having an optical sound reproducing head in accordance with the present invention comprises a constant current circuit selectively energized by an electric source. The constant current circuit includes a current control output transistor and an error current detecting amplifier. The exciter lamp is connected to the output of the constant current circuit as a load thereof so that the exciter lamp is permitted to be energized or deenergized by the constant current circuit upon energization or deenergization thereof.
Application Number:
JP4847473A
Publication Date:
July 05, 1976
Filing Date:
May 02, 1973
Export Citation:
International Classes:
G03B31/00; G05F1/56; G05F3/18; G11B7/125; H05B39/04