AES E-Library

Transistorized Magnetic and Photoelectric Input Circuits for Motion Picture Projectors

The design of a transistor input stage to work from magnetic stripe on motion picture film through a reproduce head is described. Direct expressions for amplification of induced voltage are given, both with and without series feedback. Similar expressions are given for input impedance, and the effect of input impedance on frequency response is discussed. Photo detectors for use with optical sound tracks and with transistor amplifiers are compared, and a universal input stage using a phototransistor is shown schematically.

Author: Bushman, Stephen F.
Affiliation: Bell and Howell Co., Chicago, IL
JAES Volume 6 Issue 1 pp. 4-9; January 1958 Import into BibTeX

Click to purchase paper or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member and would like to subscribe to the E-Library then Join the AES!

This paper costs $20 for non-members, $5 for AES members and is free for E-Library subscribers.

Learn more about the AES E-Library

E-Library Location: (CD aes2)   /jrnl5367/1958/6206.pdf

Start a discussion about this paper!