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1950’S Transistor Training Film " Semi-Conductors: Diode and Triode Fundamentals ” (1950)

1950 · Short film · 19 min

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Synopsis

Made for the U.S. Army, this late 1950s / early 1960s film features the fundamental principles of diodes and triodes. It was presented by The Bray Studios Incorporated (:11). It opens with diode fundamentals (:28) showing electron components comprised of semiconductor material (:34). A transistor (:42) is an amplifier serving with the same purpose as a triode vacuum tube. A crystal rectifier is shown (:51). A circuit is demonstrated to conduct current in a single direction (1:18) as a light bulb is lit. When the voltage is reversed, the light bulb remains off (1:25). Animation shows how the crystal of the crystal rectifier (1:41) is composed of semiconductor material such as silicon (1:49). A simple DC circuit is shown (2:17). Electrons within the wire current move towards the positive battery terminal (2:21). A close up shot shows the two halves types of the crystal (2:52) which have been chemically treated. One half of the material is called the N-type (3:06) and the other is the P-type (3:10). The N-type material (3:27). Foreign atoms are introduced and contribute free electrons to the crystal (3:46). These move about at high speeds (4:06). As the crystal is heated, the movement is increased (4:17) and it slows as the crystal cools (4:23). This rate of motion is thermal agitation (4:31). An example shows the whole crystal to be composed of N-type material (5:00). The current is seen flowing as voltage is applied (5:06). The crystals and wire contain free electrons (5:14).…

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Details

Running time
19 minutes
Collection
Ephemeral Films

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