AC128 transistor is a germanium positive negative positive (PNP) small signal amplifier mainly used in guitar special effects equipment and amateur radio equipment
The AC128 transistor, like most other germanium transistors, is almost outdated
Composed of a layer of negative electrode material sandwiched between two positive electrode layers. The middle layer serves as a switch and is called the base. The other layers are called emitters and collectors, and the power supply voltage and load are connected through the emitter and collector connections. In PNP transistor circuits, the collector is always positive relative to the emitter
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