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If you are a hobbyist pulling parts from a "junk box," the BD679 has a sibling that causes endless confusion: the .
The most interesting aspect of the BD679 isn't visible from the outside. Inside that TO-126 package, two NPN transistors are connected in a specific configuration called a .
A quick look at the BD679 datasheet reveals that the pinout is defined as (looking at the front face, left to right). However, its sibling, the BD677 (a PNP type), typically flips this arrangement to Emitter, Collector, Base .
Because it represents the . If you have a microcontroller (like an Arduino) that outputs a tiny 5V signal at 20mA, you cannot drive a 12V motor directly. You could use a MOSFET, but you might need a driver for it. With the BD679, the massive gain means you can often connect the microcontroller almost directly to the base (with a single resistor) and drive a heavy load.
If you were to crack open a piece of vintage audio equipment, a robust power supply from the 90s, or even some industrial motor controllers, there is a high probability you would find a small, unassuming black component labeled .
鸣谢：感谢各模拟器作者为广大经典游戏爱好者所付出的汗水和贡献；小鸡工作室尊重各模拟器作者劳动成果，所有模拟器版权归原作者所有，小鸡工作室将在以后的新版本中注明所引用模拟器! 特别感谢以下软件及作者为小鸡模拟器提供的帮助及技术支持！
