Simple electronic circuit for beginners

Last updated on May 24th, 2022 at 07:01 pm

Are you interested in electronics? But of course, the theory is boring. So let’s start with a simple electronic circuit, for beginners or who want a circuit that can be made quickly and cheaply.

Simple electronic circuit

First of all, we should know all the basics before getting on with the real circuits.

What is a simple electronic circuit?

What is an electronic circuit?

It is a combination of electronic components in a specific way. Whereby we connect it with the conductor wires for the electrical current to flow through.

What is a simple electronic circuit?

It is a circuit that small, use a few components, easy to understands working process.

Why do we learn about the simple electronic circuit?

  • Sometimes our work is required small circuits, so there is no point in using a larger circuit. Also, the smaller is the cheaper. Comparable to “do not use a sledgehammer to crack a nut”.
  • The understanding of a Simple electronic circuit will help us learn about the larger projects better. Because a large project is a lot of small electronic circuits together.

Below are the circuits we have picked for you.

1# Learn LDR automatic LED flashlight

Learn LDR automatic LED flashlight

Try a simple automatic LED flashlight. With 5 parts only.

Learn about the transistor, LDR, LED, and more work together as a voltage divider.

2# Simple Solar Plant watering Alarm


It will sound alarms when the soil is dry. So, the trees do not die. 

The solar cell is a 6V DC power supply. So, saving convenience and does not require batteries.

The circuit without using PCB. You can build easily with a few parts.

3# Make 12V 2A DC power supply

How to Build a Simple 12 volts power supply circuit

If you are looking for a 12V AC adapter, easy project.

You may love this circuit.

It can supply all circuits that require a 12V DC source under 2A.

For example CAR audio system: TDA2004 Amplifier.

Anyway, let’s get back to look at this circuit.

It is a special building with a hammer!

4# Fixed Voltage Regulator using 78xx

Usually, the main power supply of an electronic circuit is the battery.

Because it is small, energy is clean and safe.

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

For example, most circuits use a 9V battery. When its power is gone.

We need to buy a new replacement. It’s not convenient at all.

Thus, I make 9V power supply instead of it.

The first choice, we recommend using LM7809.

It is one of family IC-78xx as popular three-terminal linear regulators.

See In the circuit above.

The ACV 12V to 18V from a transformer is fed to D1-D4. They rectifier AC to DC. 

Then, C1 filters to smooth DC. 

Next,  the 7809 converts this unregulated DC voltage to stable +9V.

In addition, if you need other voltage levels.

For example, 5V digital, we use the IC-7805 instead of IC-7809.

So, use IC-7812 for 12V DC output.

If you want to build this.

You can see more simple electronic Circuits with PCB layout.

Read More about This circuit

5# First Variable power supply

Circuit Diagram of My First Variable DC Power Supply 1.25V to 30V at 1A using LM317
1.5A, 1.2V to 30V Variable power supply using LM317

Sometimes you need to use 1.5V power supply circuit.

But you cannot use IC-7805. Or.

You need to use other voltage e.g. 13V or 4.5V.

Recommended: LM317 voltage Regulator IC Calculator

In the best way, you should use a variable Regulated power supply. 

For beginner and easiest, we use LM317 (3 terminal positive adjustable regulators).

The LM317 is an adjustable regulator IC that designed to many supplies for 1.5A output.

Related: LM317 2N3055 Variable power supply

Also, it is adjustable over 1.2V to 37V, and with current limiting, thermal shutdown, and full protection.

This circuit is designed for you.

It can supply voltage 1.2V to 30V at all ranges is about 1A. 

Read More about This circuit

6# 30 Minutes Transistor Timer

We can use these simple electronic circuits. To learn the basic timer circuit.

The working of the circuit is based on learning the charge and discharge of the capacitor.

30 minutes Timer using transistors

And we can apply it to turn on-off electrical appliances.

The application, just put relay instead of LED. 

Read More about This circuit

7# Make Non-Contact Voltage Tester

Do you want a tool to check AC main without touching? 

This circuit can do it.

Simple Non-Contact AC Mains Voltage Detector

In a simple way, in-circuit use transistors without IC.

You can hear a sound, and show it with an LED display.

Read More about This circuit

8# 5-30 Minutes Timer using IC 555

This timer circuit uses a 555 IC timer. This is small, compact, and portable.

For the alarm by using the buzzer. We can select the time 5, 10, 15, and 30 minutes with S3 to S7 as the order.

It makes clear the brain is ready to continue to work.

Many friends like this. You may also like it.

You can read more: this 5-30 minutes timer with PCB layout.

9# Simplest Inverter using transistors

Simple Transistor Inverter circuit Diagram

When you need to use a small light bulb with a 12V battery.  But no light. Why? This light bulb requires high voltage,220VAC. How to convert 12VDC to 220VAC 50Hz?

You may have many ideas for this. But if you are in a hurry, here is another easy idea. It names the simplest inverter.

It just uses two power transistors, two resistors, and one transformer only. So easy! You may have them in the store.  […]

Read More about this circuit

10# Small High Volts Generator Shock!

If you want to make a funny circuit for people. This circuit may make laughter.  It is a small high volts shock circuit. The output is low current. It is not harmful to people.

high volt shock circuit using transistor

In-circuit has a few components just two small NPN transistors, 2 resistors, and a transformer. So easy to builds and inexpensive!

Read More about This circuit

11# Low Watts Audio amplifier with PCB

This is my first audio amplifier circuit. I use LM386 as the main, it is a low voltage (5V-12V) amplifier designed specifically for audio applications.

LM386 Datasheet Low voltage audio power amplifier

Which can be used with a small 9 volts Battery operated. Current use as little as 5mA. And amplification up to 500 mW.

The gain is internally set to 20. The gain can be increased to 200 by connecting a 10-uF capacitor across pins 1(+) and 8(-). Enough to expand the sound from a mobile phone to 3-inches loudspeaker easily. 

12# Stereo Low Voltage Power Amplifier

TDA2822 stereo amplifier circuit

This is my first stereo power amplifier circuit kits that can be used with a small 9 volt Battery Operated, Current use as little as 5 milliamps. And amplification up to 500 mW.

Read More about This circuit

13# LED Chaser circuits using 4017 + 555

LED chaser circuit using  4017 and 555

There are 5 circuits with PCBs for LED Chaser circuits or Running lights.

They use IC-4017 to drive LEDs and IC-555 as an oscillator pulse generator. It is best for a beginner or for kids to learn digital also my son loves them. 

Here are many interesting sites about these.

  • Top 10 Simple Electronic circuits for Beginners Read more
    Thank you for showing my circuit on site.
  • Basic Electronics: 20 steps: Read more
  • 12 Simple Electronic Circuits – A collection of Simple electronic circuitsRead more
  • EasyEDA – Online PCB design & circuit simulator Read more

14# Dual LED Flasher Working

Learn 2 LED Flasher circuits using transistor

This  calls more Free Running Multivibrator work to resemble Flip Flop. Which encourage itself repeatedly.

The Q1 and Q2 be Transistor PNP be usable general (2N3906,2N2907, etc.)

Read More about This circuit

15# Basic Music Sound Melody

How to make simple melody using UM66T

In the circuit basically usability base IC UM66T use the sound of music sweet-sounding origin and be usable easily.

It uses just integrated one circuit and a loudspeaker, piezo buzzer, the small-sized, and have power supply 3V only.

Read More about This circuit

10 Latest Simple Electronic circuits for you

Continuity tester circuit with Buzzer and LED

Continuity tester circuit with Buzzer and LED

To check solder joint defects, not kill components on PCB, as probe gives tiny current and voltage.

USB 5V to 12V DC-DC Step-Up Converter circuit

USB 5V to 12V DC-DC Step-Up Converter circuit

This Buck DC to DC circuit will increase the USB 5V to 12V or called the Boost converter circuit.

5V Low Dropout Regulator Circuit using transistor and LED

5V Low Dropout Regulator Circuit using transistor and LED

The 6V input voltage can make the output regulator 5V 0.5A. So, the voltage across it is 1V only.

Simple 1.2V AA Ni-MH Battery Solar Charger circuits

Simple 1.2V AA Ni-MH Battery Solar Charger circuits

Create it with common parts for charging 1.2V AA, So easy and cheaper

Simple Condenser Mic Preamplifier Circuit

Simple Condenser Mic Preamplifier Circuit

The mic brings to change the sound into electrical signals. it is a simple circuit and uses a 9V battery

constant current circuit using transistor

Constant current circuit using transistors

Learning experiments with simple constant current circuit using transistors, and a few plain parts, was so helpful, especially the Ni-HM battery charger.

Gel cell battery charger circuit

Gel cell battery charger circuit

It can charge any size of the Gel cell batteries and extend the life of the Gel Cell battery. While the circuit is running, the LED indicates charging.

3.7V to 5V Boost DC converter circuit

3.7V to 5V Boost/Step-up DC converter circuit using MC34063

Here is 3.7V to 5V boost converter or step up switching circuit using MC34063 and a few parts,1N5819,100uH. For 200mA-300mA of load current.


These are just a few easy circuits diagram. If you want to look at more circuits click here!

Not only that. Look at more circuits below!

See! 99+ Basic Electronic circuits


I always try to make Electronics Learning Easy.


  1. M.S.Swamy

    Can I get PCB for some of the project such as Video Amplifier,O-30 volt power supply

  2. Michael Cote

    How do I go about starting a design for an inverter that outputs 15kv ac?starting with the first segment of the design, what questions do I ask myself?  How do I decide what values to give the components of each part of the design?  Sort of a DC to DC to AC Coninvertor so to speak.  Or am I just whishfull thinking?  Either way how do I start giving values to the components to make a DC to DC Converter Work for a Set Voltage in mind, say 300kv?  How do I set the first voltage divider and establish a working Vs?

    Thank you,
    Michael Cote’

  3. raj

    hello, sir nice and valuable information in your article. the diagram is very easy and easy to read and make.
    sir, I want to know that in one of your diagrams like Learn 30 Minutes Transistor Timer you mention The Transistor value BC 549, I think this is an on/off switch transistor.
    sir can use BC 547,548 for this circuit.
    In Motor Winding

    • Hello raj,
      Thanks for your feedback.
      Yes, you can use BC547, BC548, and BC549 or BC550. They are small NPN transistors.

  4. Witek

    What kind of software do you use to generate those funky colorful schematics?

    • Hello Witek,
      Thanks for your visit. I like your question.
      Now I use the Inkscape software on Ubuntu OS.

      Before, I used Illustrator on MAC and Corel draw on Windows OS.

      Have a great day.

    • Hello Ganesh Shinde,

      Thanks for your visit to my site.

      I am sorry. Now, I do not have a 24V battery low voltage alarm circuit.

      But it is much interesting. I like this.

      Unfortunately, I am busy. I would like to find/test this circuit for you.

      I may use LM339 as the main.
      But I will add a 12V regulated power supply for LM339. Because It should get 12V stable voltage.

      Then, at the input, I will use the voltage divider circuit with 2 resistors and use a potentiometer to set sensitivity.

      This is just an idea. But I cannot confirm it will work well.

      Please think first to try it. Have fun.

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