Category:Alloy junction transistors
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English: Alloy junction transistors were an early construction technique for bipolar transistors. A germanium substrate formed the central base and (for a PNP transistor) pellets of indium were attached to each surface. These diffused into the base, forming p-type germanium and thus the emitter and collector.
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Computer Transistor 1964 CollCurrDiag.jpg 594 × 348; 30 KB
