Top Power supply circuit diagram

You are looking for many power supply circuit diagram, right?

Because the various electronic projects need to use them as an energy source.

There are a lot of circuits in categories: Power supply & Charger.

But sometimes you may want to save time and get some ideas.

So,  I recommended the circuits with PCB lists Below!

Also, they are easy to Build and Cheap.

Top 100 power supply circuits

First, look at:

3 power source for electronic devices

Let’s meet at the three most types of Power Supplies.
Types 1# Battery
A lot of circuits use a few power. So it can be powered by batteries.

This is small and easy to use anywhere. But normally they are lows voltage.


They are the best for low current using.

But for heavy load. What should we use?

The rechargeable batteries are better answered. To reuse many times to save money a lot.

I like my children to use them. Because it is safe for him.

Type 2# Solar

We can use it as solar power our circuit directly.


We like to use it is a solar charger for a rechargeable battery.

For example…

My son likes to make solar light.

Type 3# AC Line

We use the AC line, its basic is AC Adapter, like a power supply. They are the compact units and easy to use than a battery.

We can apply them to various output voltage and currents.

When we are in a house. we should use them instead of batteries and solar, it will save our money.


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

Why should 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 linear work?

First, the AC voltage to a power transformer to raise or lower the voltage.

Then, Converted to DC voltage.

And next, applied to the regulator circuit system.

It keeps the voltage and current for a load.


How Switch-mode power supply works

No transformer—It converts the AC power directly into a DC voltage without a transformer.


High frequency—this DC voltage is converted into a high-frequency AC signal.

Then, the regulator circuit inside to produce the desired voltage and current.

Linear VS Switching DC Power Supplies

In the table below is comparing various parameters of linear and switching form.

Linear VS Switching DC Power Supplies

Thanks: CR By Tekpower 30V 5A Power Supply on Amazon

30V 5A Linear Power Supply

I love the linear power supply.


They are…

  • easy circuit diagram
  • quiet
  • high stable, durable and heavy-duty
  • low noise, ripple, delay, and EMI

Which the switching type is just the opposite.
UPDATE: Now I also Love Switching DC Power Supplies
Read also: How it works
You may love it with me.

Working Learning

I know that you don’t want to waste time, want to create a supply circuit quickly. But wait. If you are a beginner.

Unregulated power supply working

Should learn its working principles At least once. To reduce mistakes And select the circuit appropriately I want to see your life easily.

8 Top power supply circuits

On our site have a lot of the power supply circuit. We cannot show you all. Thus, for saving you time see lists below.

1# First Variable DC Power Supply, LM317

LM317 Power supply circuit 1.2 to 30V 1A

You can adjust an output voltage of 1.25V to 30V at 1.5A.  I like it.  Because… It is easy and cheap.

Read More: LM317 Power supply

For example,  You can use it instead of a 1.5V battery. 

Read also: See LM317 pinout and how to use

2# Simple Fixed DC regulator


You often look at this circuit in many appliances. They are a quite old circuit, but so useful.

Because…  It is very simple with just one transistor, Zener diode, and resistor. The output voltage depends on the Zener Diode.

For example…

You want 12V supply, you use a 12V Zener diode. You can make it. I believe you! 

Continue Reading » 

3# 78xx voltage regulator—cool!

Fixed Regulator 5V,6V,9V,10V,12V 1A By IC 7805,7806,7809,7812

They are a popular 1A fixed DC Regulator, easy and cheap.

For example…

If you need  5V 1A supply for a digital circuit. We usually use LM7805 here.  Continue Reading »

Also: Learn 7805 circuit pinout and more

4# Simplest 3A Adjustable Regulator

LM350 adjustable voltage Regulator circuit
Figure1: LM350 adjustable voltage Regulator

I sometimes need to use 3A variable voltage source.


LM317 cannot help me, easily.

In a short time, we use LM350 Variable power supply.

It is the best linear [email protected]

5#  0-30V, 3A Adjustable DC Supply

The 0-30v variable power supply circuit diagram

We seldom use 3A Current that can adjust 0V to 30V output.

This is a better choice.

It uses LM723 as the famous regulator IC.

And here is modern design circuit, full protection than LM350T.  Continue Reading »

6# Variable power supply, 0-50V @3A

0-50V 3A Variable power supply

If you need to use voltage output over than 30V or adjust 0V to 50V.

You can use it. They have the key components, LM723, and the higher voltage 2SC5200 transistor.

Also, full overload protection.  Continue Reading »

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

How to Build a Simple 12 volts power supply circuit

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

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

8# 15V Dual supply for Preamplifier

15V dual power supply circuit projects

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

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

We have 3 circuit ideas for you.  Continue Reading >>


Fixed Volts regulator: 1.5V, 3V, 6V, 9V, 12V

Low volts

5V power supplies Digital power supplies

9 volts

Low Drop Out Voltage

Simple and Ideas

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 power supply. It will keep a stable voltage when it has any load.

Under 1A

2A Output Current

3A Output current

High Current (5A up)

High voltage (100V up)

Dual rail regulator & Multiple Voltage


Constant Current Source

Switching Mode Power Supply circuits

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

What is switching power supply how does it work

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 small and saving money. For application or learning.

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


Related Posts


I always try to make Electronics Learning Easy.

This Post Has 10 Comments

  1. Thanks a lot for the information

  2. I am lost, I need 1.5 volt battery P.S to light two 1.5 v miniature lights for my Buddy L trucks.The lights I have are 1.5 v, .3 amp. these could be wrong. Is there a better choice. HELP ?

  3. PS, USB 5vto 1.5v step down converter circuit, I think this one will work, I require 1.5 v battery source PS to light two 1.5 v miniature lights for my Buddy L. Do I purchase everything from you how does it work ?

  4. I am lost, I am looking for the diagram of stabilized power EURO CB 1022 if anyone can help me it would be great.

    1. Hi Eric,
      Thanks for your question. If I can you. I will be so happy.

      Do you want a power supply? How many of the voltage and current do you want?

      1. i MADE A MISTAKE PLEASE READ 2022 and not 1022
        I need the diagram of this power supply to repait my unit. This power supply is formy TX/RX radio, i need 13.8 volts 20 Amps, According advertisement i have bought a new one (Nissei PS30SWII) quite cheap 95€, but I want to get the old one repaired and to use in in my workshop.

  5. hello sir,
    i have to make an led strip driver of 12v 5amps 60w please help me to make it with smps transformer
    please help me

  6. sir how to connect VR1 in variable power supply

    1. Hello, Muhammad Aqib Ali
      Excuse me.
      Which the circuit do you want to build?

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