[/URL]Air said:I've got these two BJT circuits. I want to know if the result are the same. Are both circuits below same? Can the bottom left resistor be grounded and be same as the second circuit.
http://img21.imageshack.us/img21/2886/bjtt.jpg
Air said:Thank you.
Also, if the bottom left resistor branch didn't exist, then the current in the emitter would just be the current in the collector plus the current in the emitter?
A Bipolar Junction Transistor (BJT) is a type of semiconductor device that is commonly used as an electronic switch or amplifier. It is made up of three doped regions, two of which are of one type of semiconductor (either P-type or N-type) and the third is of the opposite type. The three regions are referred to as the emitter, base, and collector.
A BJT works by controlling the flow of current between the collector and emitter using a small current at the base. When a small current is applied at the base, it causes a larger current to flow from the collector to the emitter. This amplification effect is what makes BJTs useful in electronic devices such as amplifiers and switches.
There are two main types of BJTs: NPN and PNP. In an NPN transistor, the majority carriers (electrons) flow from the emitter to the collector, while in a PNP transistor, the majority carriers (holes) flow from the collector to the emitter. BJTs can also be categorized based on their structure, such as the planar transistor, mesa transistor, and diffused transistor.
BJTs have several advantages, such as high current gain, low noise, and low distortion. They also have a fast switching speed and can operate at high frequencies. BJTs are also more rugged and stable compared to other types of transistors, making them suitable for use in harsh environments.
BJTs are commonly used in electronic devices such as audio amplifiers, radio receivers, and digital logic circuits. They are also used in power supplies, voltage regulators, and switching regulators. In addition, BJTs are found in many industrial and automotive applications, such as motor control and ignition systems.