Are you interested in electronics? Of course, the theory is boring.

Let’s start with better simple electronic circuits.

For a beginner or who wants a circuit that quick to make and inexpensive.

Also, It is great learning! Why?

Because understanding simple electronic circuits a nice basic.

My friend said.
“A large electronics project includes a lot of small electronic circuits together”

Do you think really?

I also think it is true. Some of your work may want the tiny parts. So, small circuits will help it to work well.

So what,

I used to build a lot of small circuits. Of course, it takes a long time. Our time is precious.

I want to help you choose this circuit that is easy. And build quickly in time. I compiled a total of 15 circuits below.

Circuit 1# Lego 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.

Circuit 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.

Circuit 3# Make 12V 2A DC power supply

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!

Circuit 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.

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.

Circuit 5# First Variable power supply

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: All about LM317 voltage Regulator IC

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: simplest 3A Adjustable power supply

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

This circuit is designed for you.

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

Circuit 6# Learn 30 Minutes Transistor Timer

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

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

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

The application, just put relay instead of LED. 

Circuit 7# Make Non-Contact Voltage Tester

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

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.

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.

Circuit 9# 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?

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. 

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.

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

Circuit 11# Low Watts Audio amplifier with PCB

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

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. 

Circuit 12# Stereo Low Voltage Power Amplifier

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.

Circuit 13# LED Chaser circuits using 4017 + IC 555

There are 5 circuits with PCBs about 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. 

Note: There are many interesting sites about these.

• Top 10 Simple Electronic Circuits for Beginners Thank you for showing my circuit on your sites
• Basic Electronics: 20 Steps
• 12 Simple Electronic Circuits – A collection of Simple electronic circuits
• EasyEDA – Online PCB design & circuit simulator

Circuit 14# Learn Dual LED Flasher Working

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.)

Circuit 15# Look Basic Music Sound Melody

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.

Conclusion

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

Not only that. Look more circuits below!

Simple Electronic circuits

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