Top Power supply circuit diagram

You are looking for many power supply circuit diagrams, right? Because the various electronic projects need to use them as an energy source.

These listings below may help you choose the type to match your usage, also most of them are cheap and easy to build. But most importantly is the ideas you could get out of them.

3 Power Source for Electronic Devices

Let’s look at the three most used types of Power Supplies.

Types 1# Battery

A lot of circuits use a little power. So, it can be powered by batteries. The battery is small and easy to use anywhere. But normally they are low voltage. Thus, they are the best uses for low current loads.

But for a heavier load, what should we do?

Rechargeable batteries are a better answer. Can be reused many times to save a lot of money. I like having my children use them.

Type 2# Solar

We can use the solar cell to power our circuit directly. But usually, we like to use it as a battery charger for a rechargeable battery. For example, a battery charger inside a solar light, etc.

Type 3# AC Line

The AC line we currently used is the main source. Often through an AC Adapter as a power supply. They are more compact and easy to use than the battery.

We can adjust its output to various voltage and currents.

When we are at home. We should use them instead of batteries and solar. Because it will save our money replacing our batteries when it is dead and convenient, no need to wait for sunlight when using a solar cell.

Caution:

We must use it carefully. It is many useful but also can kill you! Safety first!

Why should we use a linear power supply?

There are many kinds of power supply circuits. But they can all be put into two groups.

• Linear Power supply
• Switching mode power supply

How does the linear power supply work?

The AC voltage that goes through a power transformer will be raised or lower depending on the type of the transformer, and then converted to DC voltage. Next, the voltage will go through the regulator circuit system to keep the voltage and current stable for a load.

The explanation above is oversimplified if you want in-depth information. Click here

How does the Switch-Mode Power Supply work

It does not contain a big-size transformer instead it directly converts the AC power into a DC voltage. Then, this DC voltage is converted back into an AC signal with a higher frequency than before.
And, the regulator circuit inside will produce DC voltage and current as desired.

The difference between linear and switch-mode power supply

The table below compares various parameters of linear and switching forms.

Thanks: Tekpower 30V 5A Supply

I love the linear power supply. Why?

They are:

• Easy to understand a circuit diagram
• Quiet
• High stable, durable and heavy-duty
• Low noise, ripple, delay, and EMI

The switching type is all but just the opposite.

UPDATE: But now I also love it. Because it is better than the linear for its higher efficiency, cheaper, smaller, etc. Causing it to be more popular than before. You may love it with me.

Still curious? Click here to find out: Basic AC-DC Power Supplies

Power Supply circuit Expalintion

If you are a beginner, I know that you do not want to waste time learning principles, and want to create a power supply circuit quickly.

But you should learn its working principles at least once. To reduce mistakes and select the circuit appropriately for your usage. It will make your life easier.

Step 1. Principle of Unregulated Power Supply

Almost all circuits are based on this principle. So, you should read it beforehand.

Step 2. Principle of Fixed Voltage Regulator

Even though we do not like complexity. But every project needs good stability. So, this is necessary!

Step 3. Overload and short circuit protection

Let’s learn about the transistor series voltage regulator with short circuits and overload protection. And how it reduces ripple.

Step 4. How 741 Op-Amp Power supply Circuit works

Learn an error voltage sensor using transistors circuit work inside of variable voltage regulator using 741 and 2N3055.

Step 5. How to increase current using transistor

Learn how to increase/boost up current of 7805 (or 78xx) regulators with helping the 2N3055 and others transistors.

12V 5A DC Power Supply design

Top 8 power supply circuits

On our site have a lot of power supply circuits. We can not show it all to you. Thus, for saving you time see the lists below.

1# My First Variable DC Power Supply

You can adjust an output voltage from 1.25V to 30V at 1.5A.  I like this one.  Because… It is easy and cheap. For example,  You can use it instead of a 1.5V battery. 

Let’s create your first power: LM317 Power supply

Read also: LM317 pinout and how to use, Calculator Datasheet

2# Simple Fixed voltage DC regulator

We often found this circuit in many appliances. They are quite old circuits but still have many uses.

It is very simple with just one transistor, Zener diode, and resistor. The output voltage depends on the Zener diode. For example, if we want a 12V output, then use a 12V Zener diode.

Let’s Create Simplified Transistor Series Fixed Voltage Regulator

3# 78xx voltage regulator

78xx is a popular 1A fixed DC Regulator. Because of easy to use and cheap. And the output depends on the IC. If you need a 6V 1A output for a digital circuit, then the LM7806 is your pick.

Also Learn: 7805 voltage regulator circuit, pinout, and more

4# 3A Adjustable Regulator using LM350

I sometimes need to use 3A variable voltage source.

But…

LM317 cannot help me, easily.

In a short time, we use the LM350 Variable regulator.

It is the best linear IC@3A. The output is 1.25V to 25V.

5# 0-30V, 3A Adjustable DC Supply

6# 0-50V Variable supply @3A

7# Build 12V 2A power supply with a hammer

If you hurry up and have no PCB. This idea may good. You can build a 12V 2A adapter easily and cheaply.

By using a hammer and snail on the wood board.   Also, to learn more. 

8# 15V Dual supply for Preamplifier

If you need to use many circuits using OP-AMP.

For example, Preamplifier with tone control and more. They need to use +/- 15V regulated supply.

We have 3 circuits using 7815-7915 and transistors 

 

Other Linear Power Supply Circuit Diagram

Fixed Volts regulator:

• 12V 1A linear regulator using transistor and Zener diode
• 1.5V,  3V,  4.5V, 6V,  9V at 1.5A Selector Voltage regulator
• 12V and 5V output Many ideas of 12V and 5V Dual Power SupplyCircuit Diagram at 3A max

• USB 5V to 1.5V/3V DC Adapter ( Converts USB to 1.5V or 3V output)

• Digital DC Regulator If you are looking for a 5V power supply for the digital circuit. But you have a 12V source and battery. I will show you, a 12V to 5V converter step-down regulator. In many ways for using, it depends on the parts you have and other suitability.  Recommend
• Raspberry pi 5V 3A power supply with 3 ideas that you can do it.
• 5V 5A, Top Linear Regulator
• Small Uninterruptible UPS

• A lot of 6V supply diagrams
• 12V to 6V Converter circuits —Your load is too hot. It will be damaged. Why? You connect it to a 12V battery. It can get 6V only. If you do not want this to you. You should read 10 ways to make a 12v to 6v step-down circuit.

• 9V Power Supply circuit for any circuit requires a stable power supply, low noise, and safety from AC high voltage leakage.
• 9 volts 2 Amps DC Converter
• Negative Voltage Regulator using PNP Emitter Follower

• Dual Power regulator +12V/-12V using 7812, 7912

• 24V 2A supply circuit Diagram
• 18V DC voltage regulator using 7818
• 5V Low Dropout Regulator Circuit using transistor and LED Make 5V low dropout regulator circuit using transistor and LED lowest voltage input is 6V so across it is 1V only, make output is 5V 0.5A

Adjustable Power Supply Circuit

What is a variable power supply?

Simply said it is a power supply that can adjust the output voltage or current. But it still has the same characteristics as a fixed regulated circuit. It will keep a stable voltage when it has any load.

Start with: Simple Variable power supply circuits

• 7805 Adjustable voltage regulator, 5V to 25V
• Variable Regulated Power supply using 7805 and op-amp

• 0-70 volts 2 Amps DC variable —look at Here
• Cheap DC adjustable 0-30V 2A Laboratory —look at Here

• DC 3A, adjustable 1.2V-20V; 3V-6V-9V-12V
• 0-12v variable at 3A

• LM338 Variable Supply, 5A
• 12 volts,13.8V High Current 30A,25A,20A,15A  for HAM Radio DC [Easy but well]
• 0-30V, 5A DC Adjustable Regulator using IC-723, 2N3055x2
• Many Amplifier power supply circuits
• 10A, DC Supply FIX Regulated by IC-78XX and MJ15004
• 0-30V 20A, High current variable regulator using LM338

• 0-300V, high voltage variable
• High volt shock using 2SC458
• How to make a 1.5V to 220V inverter
• Many high volt power supply circuit ideas

• Simple DC regulator, 12V, 15V,  30V
• Dual adjustable regulator using 7805 and 7905 +Update
• Power Supply Splitter circuit using op-amp +New

• 3 Transformerless power supply circuits
• 5V DC Regulator Without Transformer Using MOSFET  +Update

• Many Constant current source circuits
• Constant current circuit using transistors
• 7805 Current constant for the battery charger
• Variable Zener Diode circuit
• Voltage Reference using LM334

Switching Mode Power Supply circuits

These are DC switching power supplies. To are ideas on building the projects or tools. Because they have a small size and are cheaper than the linear version.

Learn: What is switching power supply

My site begins to have many circuits. Until friends said that difficult to see circuits or projects as he wants.

A particular DC switching power supply has very useful. The list below is ideas to build a great power supply that is small and saves money. For application or learning.

So, I collect these circuits for ease of accessing the projects that I am interested in. Also, they may be useful for you, too.

Switching Mode regulator

• 5V 3A switching regulator using LM2576
• Variable switch mode Regulator 0-50V 5A
• Old PC power supply circuits

DC to DC converter

• USB 5V to 12V DC-DC Step-Up Converter circuit
• 3.7V to 5V Boost converter circuit using MC34063
• 1.5V/3V Step down switching regulator(5V input) using KA34063
• Switching Regulator 12V 3A using LM2576-12
• LM2678 – 3.3V, 12V, 5V 5A Switching fixed voltage regulator
• MC34063 Stable battery switching regulator
• LED driver low power using switching Mode
• LM2596 circuit voltage regulator and LM2673 datasheet
• LM2577 Boost Converter circuit | Step up | Datasheet | Pinout
• DC converter 5 volts to +12 volts or high volt than +12 volts