Table of Contents
How do you read a BJT?
A Bipolar Junction Transistor (also known as a BJT or BJT Transistor) is a three-terminal semiconductor device consisting of two p-n junctions which are able to amplify or magnify a signal. It is a current controlled device. The three terminals of the BJT are the base, the collector and the emitter.
How does a BJT work briefly explain?
How does BJT Work? For an NPN transistor, it consists of a layer of P-doped semiconductor between two layers of N-doped material, where electrons are passed from the emitter to the collector instead. The emitter then “emits” electrons into the base, with the base controlling the no. of electrons the emitter emits.
Why are transistors so hard to understand?
The transistors are made so that the number from emitter to base is much greater than the number from base to emitter. Sometimes as much as 100 to 1. The base is very thin so that the motion of the carriers injected into the base from the emitter keep on going and finally end up in the collector.
How do I know if BJT is working?
Hook the positive lead from the multimeter to the to the EMITTER (E) of the transistor. Hook the negative meter lead to the BASE (B) of the transistor. For an good NPN transistor, you should see “OL” (Over Limit). If you are testing PNP transistor, the meter should show a voltage drop between 0.45V and 0.9V.
What do you know about thyristor?
A thyristor is a four-layer device with alternating P-type and N-type semiconductors (P-N-P-N). The primary function of a thyristor is to control electric power and current by acting as a switch.
What is your understanding about latching or regenerative process in thyristor?
Once the thyristor has been turned “ON” and is passing current in the forward direction (anode positive), the gate signal looses all control due to the regenerative latching action of the two internal transistors. Therefore the thyristor can also be thought of as a Bistable Latch having two stable states “OFF” or “ON”.
Why is it important to have an understanding about thyristor?
The primary function of a thyristor is to control electric power and current by acting as a switch. For such a small and lightweight component, it offers adequate protection to circuits with large voltages and currents (up to 6000 V, 4500 A).
What is a BJT (bipolar junction transistor)?
These words describe the operation of a BJT which is the transfer of an input signal from a low resistance circuit to a high resistance circuit. In this article, let us learn more about the Bipolar Junction Transistor. What is a Bipolar Junction Transistor (BJT)?
How many ways can a BJT be connected in a circuit?
BJT can be connected in three different configurations by keeping one terminal common and using the other two terminals for the input and output. These three types of configurations respond differently to the input signal applied to the circuit because of the static characteristics of the BJT.
What is the sign convention of current entering a BJT?
Current entering the emitter, base, and collector has the sign convention of positive while the current that leaves the transistor has the sign convention of negative. BJTs are of two types namely NPN and PNP based on doping types of the three main terminals.
How many regions are there in a BJT?
The BJT is formed by three layers of semiconductor materials, if it is a PNP transistor, it will have two P-type regions and one N-type region, likewise, if it is an NPN transistor, it will have two N-type regions and one P-type region.