Simple electronic circuit for beginners

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?

My daughter has asked me: “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 small circuit, uses a few components, and the working process is easy to understand. In my opinion, to keep it simple, it is the circuit that combines components under 25 pcs.

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 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 larger projects better. Because a large project is a lot of small electronic circuits together.

If you want to learn more about electronic circuits in depth or technically. I recommend reading more on Wikipedia.

If you are only an electronic hobbyist like me. Let’s see the circuit below.

Are you a beginner?

Before creating various circuits, you should:

Basic Electronic components list with images

Below are the circuits we have picked for you.

Automatic LED Night Light circuits

automatic baby night light circuit (updated)

Try making a simple automatic LED flashlight with only 5 components. And, we would have learned about the transistor, LDR, LED, and more that work together as a voltage divider.

Let’s Create Kids Night Light Circuits

Simple Solar-powered Plant watering alarm circuit


It will sound an alarm whenever the soil is dry. So, we can water the plant to prevent it from dying. The solar cell works like a 6V DC power supply to save us money by not requiring batteries. It can be built easily with a few parts (without IC).

3# Make a 12V 2A DC power supply

How to Build a Simple 12 volts power supply circuit

If you are looking for a 12V AC adapter. You can create it yourself even as a newbie. It can supply all circuits that require a 12V DC source under 2A. For example, the TDA2004 audio Amplifier.

Especially, it is built with a hammer!

4# Fixed Voltage Regulator using 78xx

Most of the time, the power supply of a small electronic circuit is the battery. Because it is compact and energy is clean and safe. For example, most circuits use a 9V battery. But when the power ran out.

We will need to buy a new replacement. It is not at all convenient.

That is why I created a 9V power supply instead. We recommend using LM7809. It is one of the family IC-78xx popular three-terminal linear regulators.

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 a 9V power supply instead of it.

The first choice, we recommend using LM7809.

It is one of the family IC-78xx 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, in 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 layouts.

Read More about This circuit

First Variable power supply

LM317 power supply circuit

Sometimes you need to use a 1.5V power supply circuit instead of a battery. Or other voltage levels such as 13V, 4.5V, 7.5V, and more. The best way is you should use a variable regulated power supply.

For beginners and easiest way is to use LM317 (3 terminal positive adjustable regulators).

Recommended: LM317 Voltage Regulator IC & Calculator

P.S. I also start with this IC. It is my first power supply. Past 30 years it still has worked well. It can supply voltage 1.2V to 30V at all ranges is about 1A.

Let’s make: LM317 Power supply

30 Minutes Transistor Timer

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

30 min transistor timer circuit

The working of the circuit is based on learning the charge and discharge of the capacitor. And we can apply it to turn on-off electrical appliances.

In the application, just put relay instead of LED.  Create : 30 min transistor timer circuit

Non-Contact Voltage Tester circuit

Do you want a tool to check the AC main without touching it?  This circuit can do it.

In a simple way, in-circuit use transistors without IC. You can hear a sound, and show it with an LED display. Let’s create Non-Contact Voltage Tester circuit

5-20 Minutes Timer using 555 timer

This timer circuit uses a 555 IC timer. This is small, compact, and portable. For the alarm by using the buzzer. 

5-20 Minutes Timer using 555 timer

We can select the time 5, 10, 15, and 20 minutes with S3 to S7 as the order. You can read more: 5-20 minutes 555 timer with PCB layout.

Simplest Inverter using transistors

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?

simple AC inverter circuit

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.  […]

Let’s create: Simple AC inverter circuit

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 voltage generator shock

In-circuit has a few components just two small NPN transistors, 2 resistors, and a transformer. So easy to build and inexpensive! Create: Small High Voltage Generator circuit Shock!

Easy 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 audio amplifier circuit

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.  Read more: LM386 audio amplifier circuit

Stereo Small Power Amplifier

TDA2822 stereo amplifier circuit

This is my first stereo power amplifier circuit kit that can be used with a small 9 volt Battery Operated, Current use is as little as 5 milliamps, and amplification up to 500 mW. It’s enough to amplify the sound from your cell phone to make it louder and clearer. Let’s build: TDA2822 stereo amplifier circuit

LED Chaser circuits using 4017 + 555

LED Chaser circuits using 4017 + 555

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

They use CD4017 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. 

Learn more: LED Chaser circuits using 4017 + 555

Let’s Learn 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

simple melody circuit

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

All electronic circuits for beginners

There are many circuits on my site you can look at the list below.

Sound Generator

Making Simple Buzzer circuit —Let’s make the electronic buzzer circuit in simple ways. But useful well worth and the price is lower than 1$. By using just a 9-volt battery only. […]


Automatic Solar Light circuit — Let’s create a simple automatic solar light circuit or a Solar Night Light Circuit. My kids made it for daily use and to learn electronic circuits. They worked well, so we are happy. […]

10 Latest Simple Electronic circuits for you

Toy Organ circuit using transistors

Toy Organ circuit

Let’s play with a simple toy organ circuit. A daughter of mine has interested in piano. But at the moment we are unready to study it. Believe it or not, we can create a simple piano circuit by ourselves. It reminds me of this organ circuit, that I made when I was a kid. But now I will use this to teach my daughter about simple electronics and have a fun time together.

Continuity tester circuit with Buzzer and LED

This is a continuity tester circuit with a buzzer and LED. Also, I like this circuit. Because unnecessary to take my eyes off the tested circuit. We will hear the buzzer and see LED glows.

The 741 is good at detecting a tiny amount of voltage. So, we use it to compare a different voltage between the inverting and Non-inverting input. That difference voltage got increased to be sent to the output. This is called the op-amp comparator. Read more

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

This circuit is a boost converter which is different from the buck converter circuit we have learned about before. That is this circuit increases the voltage from USB 5V to 12V DC to DC by a step-up converter circuit.

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

See a complete circuit diagram below. We place the main parts are D1 and L1, they act as a voltage converter circuit. For the switch (S), we use two transistors Q1 and Q2, they will work feedback to each other. Read more

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 a simple constant current circuits 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 battery 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 a 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

Get Ebook: Simple Electronics Vol-03


I always try to make Electronics Learning Easy.

18 thoughts on “Simple electronic circuit for beginners”

  1. 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’

  2. 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.

    • 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.

  3. There are a few projects where you have added PCB artwork… would it be possible to get the PCB artwork in Gerber format, where we could get the board made by JLCPCB for only a couple of dollars


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