Top Power supply circuit diagram

A power supply circuit is what importance of various electronic projects. My website has big size grow up every day, Some time you may look for difficult. So I collect them (over 150+circuits) on Category:

Power supply circuit

But We want you to save time,it is therefore recommended circuit below, with the PCB and easy to build and low price for beginner and all happy.

power supply circuit with pcb

Power Supply for Electronic Circuits
1. Battery
A lot of Circuits use a few power can be powered by batteries. This is small and easy to use anywhere. But normally it lows voltage best for low current using. We should rechargeable batteries to reuse many times to save money a lot. I like my children use them. Because it is safe for him.

2. Solar
We can use it as solar power our circuit directly, But we like to use it is a solar charger for a rechargeable battery. Eg. My son like to make the solar light

3. AC Line
We use AC line that basic is AC Adapter. They are units compact and easy to use than a battery and can apply in various output voltage and currents as we need. When we are a home popular use them instead batteries and solar it saves.
Caution: We must use it carefully Safety first it many useful but also can kill you!

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

Power Supply Circuit are Recommended

  1. My first Variable DC Power Supply Circuit, 1.2V to 30V 1A using LM317
    I like to use it because it’s easy to use, easy to create, and good to save. For example, if you want to replace it with a 1.5V battery, it’s easy.
  2.  Second, First Fixed DC regulators using Zener diode and transistors is small and cheap circuit you can build it. I believe you!
  3. 5V, 6V, 9V, 10V, 12V, 1A Fixed Regulated using IC-7805, IC-7806, IC-7809, IC-7810,IC-7812Fixed voltage regulators
    They are the best popular 1A fixed DC Regulators for me, it is easy and cheap For example when we need to use 5V 1A for a normally digital circuit we usually use LM7805-IC is cheaper.
  4. 1.2V-25V, 3 amps, Adjustable regulators using LM350T
    I sometimes need to use 3A variable voltage source. But LM317 cannot help me easily. In short time we use LM350T it is best linear [email protected]
  5. 0-30V, 3A Adjustable DC Supply
    We seldom use 3A Current that can adjust 0V to 30V output. This is a better choice. It uses LM723 that is best other one DC voltage regulator IC, but modern design circuits. With full protection than LM350T but expensive than it.
  6. 0-50V Variable Voltage output @3A
    If we need to use voltage output over than 30V or adjust 0V to 50V, we can use it. They have also LM723 as key part and higher voltage 2SC5200 transistor and with full protection overload current. You will like it same us.
  7. Simple Zener diode voltage regulator circuits
    Here is a simplest DC fixed regulator circuit. It include zener diode as act a reference voltage and a transistor to increase current up to output. Although the TDA2030 can deliver 20 watts of output power


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

  1. Unregulated
  2. Variable Zener Diode circuit
  3. Voltage Reference using LM334
  4. 15V 400mA DC Regulator by IC-748 and 2N3055
  5. 24V 2A power supply circuit
  6. 6V – 9V for a calculator
  7. 12V 1A linear regulator using transistor and Zener diode

Digital power supplies

9 volts

  1. 9V Regulated using a TIP31 transistor
  2. Mini 9V 0.75A using transistors
  3. 9 volts 2 Amps DC Converter
  4. 9V Negative units

Low volts

  1. Small uninterruptible UPS
  2. Basic Dual DC6V
  3. Easy Power supply for a cassette player
  4. Simple DC Regulators 12V,15V,30V

Low Drop Out Voltage

  1. 5 volts Low DC Regulator circuits

Simple and Ideas

  1. Basic DC voltage Regulated 13V low current
  2. 18V DC power supply by 7818

Adjustable Power Supply Circuit

Under 1A

  1. Simply adjustable 0-30V at 1A
  2. Power supply regulator 0-30V 1A by IC 741 + Transistor 2N3055 & 2N3565
  3. 0-20V,1A DC adjustable
  5. Variable Regulated Power supply using 7805 and op-amp

2A Output Current

  1. Simple variable, 0-30V, 2A for beginners
  2. 0-70 volts 2 Amps DC variable
  3. Cheap DC adjustable 0-30V 2A Laboratory

3A Output current

  1. 1.2V-25V, 3 amps, Adjustable regulators using LM350T
  2. Best DC power supply 3 amps, adjustable 1.2V-20V; 3V-6V-9V-12V
  3. 0-12v variable power supply at 3A

High Current (5A up)

  1. 12 volts,13.8V High Current 30A,25A,20A,15A  for HAM Radio DC [Easy but well]
  2. 1.2 – 30V, 5A Adjustable using LM338
  3. 0-30V, 5A DC Adjustable Regulator using IC-723, 2N3055x2
  4. High Current Variable Voltage Regulator 2-36V 10A
  5. Amplifier power supply using High Current Transformer
  6. 10A, DC Supply FIX Regulated by IC-78XX and MJ15004
  7. 1-20V, 10A Adjustable DC power supply using LM338
  8. 12V, 20Amp DC Regulated
  9. 0-30V 20A, High current variable regulator using LM338

High voltage (100V up)

  1. 0-300V, high voltage variable
  2. High volt shock using 2SC458
  3. Mini High Volt Supply using 2N2222
  4. 10V to 350V adjustable Regulator

Dual rail regulator & Multiple Voltage

  1. Simple DC regulator 12V 15V 30V by Zener diode
  2. +15V /-15V 1A using IC-7815, IC-7915 Power supply regulator
  3. 15V Dual DC Regulator Circuits
  4. Dual Power regulator +12V/-12V using IC-7812, IC-7912
  5. Power Supply Splitter circuit using op-amp +New
  6. Simple dual rail voltage regulator using zener diode +update


  1. Many Transformerless AC to DC
  2. 5 volts DC Regulator Without Transformer Using MOSFET

Constant Current Source

  1. The constant current circuit using LED
  2. FET Constant current drivers for LED display
  3. Many Constant current source circuits
  4. 7805 Current constant for battery charger
  5. Super Steady Zener diode circuit

All tags:

Sometimes you may do not have idea or difficulty search any projects TAGs may be can help you!
:: 5V :: 6V :: 9V :: 12V

:: 0-30V :: Switching :: Dual output

:: 5V Switching :: Protection

::Multi voltage :: 12v switching :: DC15V

:: Negative :: AC high voltage

:: Power supply units :: 10A :: Mini supply

:: Transistor Power supplies :: Transformerless :: 50V

:: PC power supply

Note :
All DC switching power supplies

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  1. Raja February 23, 2018 Reply
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