Journal of the Society of Motion Picture Engineers (1930-1949)

Record Details:

Title:
Journal of the Society of Motion Picture Engineers
Date:
1930-1949
Publisher:
New York, N.Y. : The Society
Volume:
Journal of the Society of Motion Picture Engineers
Leaf #:
000173
Language:
English
Collection:
Technical Journals
Format:
Periodicals
Contributor:
Prelinger Library
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
The Journal of the Society of Motion Picture Engineers (SMPE)Êdocuments the technological progress of the film industry, highlighting technical developments in production and exhibition. Of special interest are articles about special effects, theater practices, lighting, and the introduction of the 16mm format. Initially titled "Transactions of the Journal of the Society of Motion Picture Engineers."Digitized by the Prelinger Library and the Library of Congress Motion Picture, Broadcasting and Recorded Sound Division.
Date Added:
July 19, 2022
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170 TEMPLIN August POWER UNIT The R A1284 power unit provides plate and heater voltages for all vacuum tubes and 12 volts direct current for the recorder exciter lamp. The power unit operates from a single-phase, 50 to 60-cycle power source of 100 to 130 volts. Taps on the input transformer provide for a power supply nominally 105, 115, or 125 volts. A schematic of the unit is shown in Fig. 8. A power-supply switch controls power to the complete system. The 12-volt, direct-current portion of the unit utilizes a bridge-type selenium rectifier and inductance-capacitance filter. This circuit supplies 4.5 amperes to the RECEPTACLE FOR POWER INPUT r CABLE RECEPTACLES FOR INTERCONNECTING CABLES TO AMPLIFIER Fig. 9 — R A1284 power unit — front view. recorder exciter lamp and 0.3 ampere each to the heaters of the two mixer preamplifiers and the first amplifier stage in the main amplifier. These three heaters are fed through separate ballast lamps which regulate the current to the required value independent of powersupply voltage, variations in lamp current, and length of connecting cables between the amplifier and the mixer.. The remaining tubes in the RA-1282 amplifier receive heater supply from a 6.3-volt, alternating-current transformer in the power unit. The centertap of the winding receives a 6-volt bias from resistances R8 and R9, which reduces to a negligible value the introduction of hum components from the heaters. The plate-supply circuit provides 30 milliamperes regulated at 180