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Brainchild Electronic electrical components are semiconductor triodes, also known as bipolar junction transistors or crystal triodes, which are semiconductor devices that control current. Their function is to amplify weak signals into electrical signals with larger amplitudes, and they are also used as contactless switches. The triode is one of the basic semiconductor components, featuring current amplification capability, and is a core component in electronic circuits. A triode is formed by fabricating two closely spaced PN junctions on a single semiconductor substrate; these two PN junctions divide the entire semiconductor into three parts, with the middle part being the base region, and the two