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.
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