Why resistor is used in voltage regulator?

The series resistor, R1, needs only to stabilize the load; it compensates for any difference between the diode operating voltage and the unregulated input voltage. The value of the series resistor depends upon the combined currents of the Zener diode and the load.

What is the purpose of using an external pass transistor with an IC voltage regulator?

The external pass transistor increases the available load current by creating an additional path from input to output. The path in this case was designed for an additional 150mA, but you can obtain larger output currents by substituting other components in the circuit.

Why do we need an emitter bypass capacitor?

A bypass capacitor basically bypasses A.C. noise that may be on a D.C. signal. If the bypass capacitor is removed, an extreme degeneration is produced in the amplifier circuit and the voltage gained will be reduced. Thus, the sole purpose or role of an emitter capacitor is to avoid voltage gain drop.

Does a resistor regulate voltage?

Resistors are electrical devices that restrict the flow of electrical current through a circuit. Resistors can be used for several functions, such as voltage isolation or setting a limit for how much current flows through the circuit. Using resistors for either function allows the power of the circuit to be regulated.

What is resistor regulator?

Both the linear regulator and resistor generate about the same power loss equal to the load current times the difference in supply and load voltages. The resistor needs a very slightly lower power but the regulator well regulates the load voltage.

What is the importance of a regulator in common circuit applications?

voltage regulator, any electrical or electronic device that maintains the voltage of a power source within acceptable limits. The voltage regulator is needed to keep voltages within the prescribed range that can be tolerated by the electrical equipment using that voltage.

What are the advantages of voltage control?

Advantages

• Output voltage regulation is good (tap switching) to very good (double conversion)
• Ultrafast voltage correction speed.
• No restrictions on the number of correction cycles.
• Versatility of kVA rating, voltage and configuration.
• Very low or no regular maintenance.
• Good line isolation.

What is a base resistor and why do we need one?

And, that’s actually an excellent question, about something that we usually gloss over. The short answer is that this is a “base resistor” that we use to limit the maximum current that flows through the base of the PNP transistor. But, let’s take a look in a little more detail, and see what would happen if we didn’t have that there.

Why is the current constant in a series pass transistor circuit?

Keeping the current constant regardless of the current taken by the series pass transistor in the circuit helps maintain a much better level of regulation. Also stand-alone current sources are also needed in processes ranging including electrochemistry and electrophoresis.

What is the use of transistors in electrical circuits?

Transistors are often used as electronic switches, to control loads which require high voltage and current from a lower voltage and current. The most common example you’ll see of this in a physical computing class is to use an output pin of a microcontroller to turn on a motor or other high current device.

What can a transistor do for a microcontroller?

The output pins of a microcontroller can only produce a small amount of current and voltage. But when coupled with a transistor, they can control much more. You should have read the notes on high current loads before doing this lab.