Here is the simple electronic circuits list for a beginner. Or, who want small circuits to quick to make and inexpensive.  Also, they are easily learning. The understanding the simple electronic circuits are very important. My friend said the large electronics project come of combining many small electronic circuits.

I also think that this passage is true. Some of your work may lack small things. The small circuits will help it to work well.

List of simple electronic Circuits

1. Lego automatic LED flashlight

This is a simple automatic LED flashlight circuit. It uses 5 parts only. You can learn about the transistor, LDR, LED. They work together as a voltage divider. Continue Reading>>

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 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. Continue Reading>>

3. 12V 2A DC power supply

If you are looking for a 12V AC adapter to use with Car audio system like this project, TDA2004 Amplifier. It needs 12V supply more than 2A current for stereo. Anyway, let’s get back to look at this circuit. It is a special building with a hammer! Continue Reading>>

4. 1A Fixed 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 from family IC-78xx as popular three-terminal linear regulators. In the circuit above.

The ACV 12V to 18V from a transformer is fed to D1-D4. To 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 IC-7812 = 12V DC output.

If you want to build this. You can see more simple electronic Circuits with PCB layout.

5. 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.

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.

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. Continue Reading >>

6. 30 Minutes Transistor Timer

We 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.  Continue Reading >>

7. Simple non-contact voltage tester using transistors

Do you want a tool to check AC main without touching?  This circuit can do it. In a simple way, in circuit use transistor without IC. You can hear a sound and show with LED display. Continue Reading>>

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 circuit 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. Continue Reading >>

10. Small high volts shock using 2SC1815 transistor

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! Continue Reading>>

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. Read more and look PCB layout>>

12. Low watts Stereo 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. Continue Reading>>

13. LED Chaser circuits using IC 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. Continue Reading>>

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

14. Dual LED Flasher using 2N2907

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.) Continue Reading>>

15. Simple music sound 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. Continue Reading>>

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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