# What is DC variable power supply?

## What is DC variable power supply?

A variable power supply is one which includes some means for the user to easily adjust the output voltage and sometimes the current. Adjustment is most often accomplished with a potentiometer, but may also be done with an analog control voltage, a digital input, an autotransformer, etc.

## What does a variable DC power supply do in a circuit?

A variable power supply is one which facilitates the user to vary and adjust the desired output voltage and output current. Usually, a potentiometer is used for voltage adjustments.

Why DC power supply is needed?

DC allows for a constant flow of current to a device. Because AC is delivered initially, power must first be converted from AC to DC. Most smaller electronic devices (such as computers) require direct current to operate with an AC-to-DC converter from wall power.

How do you find a DC supply variable?

To make Variable DC power supply, you will required following list of components;

1. Transformer 220V to 30V ,2A rating.
2. Diodes.
3. High capacitance capacitor (1800uF)
4. Small capacitors for IC.
5. IC LM317.
6. Resistors of 500 ohms.
7. 1.5A fuse.
8. Probes .

### Why regulated DC power supply is used?

A regulated power supply (also known usually as a linear power supply) ensures that the output current remains constant, even if the input changes, by converting unregulated AC (alternating current) to a constant DC (direct current).

### How do you regulate a DC power supply?

Step By Step Method to Design 5V DC Power Supply

1. Step 1: The Selection of Regulator IC. The selection of a regulator IC depends on your output voltage.
2. Step 2: The Selection of Transformer.
3. Step 3: The Selection of Diodes for Bridge.
4. Step 4: The Selection of Smoothing capacitor and Calculations.

What is variable DC voltage?

Variable DC voltage as a solution to improve output voltage quality in multilevel converters. Abstract: As the multilevel converters have many advantageous features over the conventional two-level converters, they have been widely investigated and applied in industry.

How does a variable regulated power supply work?

A variable regulated power supply, also called a variable bench power supply, is one where you can continuously adjust the output voltage to you requirements.

#### Why do we need variable DC voltage?

1. The DC voltage you have now is NOT fixed in its value(because supply AC voltage is always variable due to load fluctuation). 2. Now,if you draw power from this DC source at different loads(or different current requirement),the voltage you will get will be different in each case.

#### What is fixed DC and variable DC?

Answer: A battery is a fixed DC supply, within its rated working voltage. Rectified DC output from AC supply source without smoothing is a varying DC , not variable. By variable supply we mean a supply whose voltage or current can be varied by some means, and is not fixed once for all.

What devices use DC?

Examples of DC electronics include:

• Cell phones.
• The LilyPad-based D&D Dice Gauntlet.
• Flat-screen TVs (AC goes into the TV, which is converted to DC)
• Flashlights.
• Hybrid and electric vehicles.

Does DC have 3 phase?

DC motors, and all DC appliances and devices are not available in “3phaseDC.” 3 phase is exclusively an improved AC power system and cannot be applied to DC systems.