Is BJT a voltage regulator?
BJT Based Voltage Regulator: Circuit # 2 It amplify the current sent to the base of the upper transistor (ie, base current of upper BJT).
What does the voltage regulator connect to?
A tractor’s regulator takes the voltage provided by the battery, manages it by reducing it, and sends it on to the alternator or generator at a constant volume that the alternator sends on to the coil. There are three wires that must be connected to the correct regulator terminal.
What are the terminals on a voltage regulator?
As the name suggests, three terminal voltage regulators have three terminals namely input which is unregulated (Vin), regulated output (Vo) and common or a ground terminal. These regulators do not require any feedback connections. Figure shows the basic the 3 terminal voltage regulator.
How does the Zener diode regulate the BJT?
So a low power rated zener diode can regulate the base voltage of the BJT that can pass a huge current through it. In some cases, the zener diode connected to the base of transistor will not provide enough base current. To solve this problem, an additional transistor is used as shown in the following circuit.
How is the BJT differential pair a differential amplifier?
The differential pair is a differential amplifier—we express its performance in terms of differential and common-mode gains. Consider the BJT differential pair: 2 1 Also, we know that: Therefore, the emitter currents can be written in terms of the base voltages as: Of course, we know that Ii i= EE12+ , thus:
How is a transistor used as a voltage regulator?
Transistor Based Voltage Regulator: Circuit # 1. The BJT is used in Emitter-Follower configuration. ie, the emitter will follow the base. The zener diode is used to regulate the base voltage which leads to regulated emitter voltage. Note that in a transistor the current required by the base is only 1/hFE times the emitter to collector current.