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
Page Contents, Click
- 1. Lego automatic LED flashlight
- 2. Simple solar plant watering alarm
- 3. 12V 2A DC power supply
- 4. 1A Fixed Regulator using 78xx
- 5. Variable power supply using LM317
- 6. 30 Minutes Transistor Timer
- 7. Simple non-contact voltage tester using transistors
- 8. 5-30 minutes timer using IC 555
- 9. Simplest Inverter circuit using transistors
- 10. Small high volts shock using 2SC1815 transistor
- 11. Low watts Audio amplifier with PCB
- 12. Low watts Stereo amplifier
- 13. LED Chaser circuits using IC 4017 + IC 555
- 14. Dual LED Flasher using 2N2907
- 15. Simple music sound using UM66T
- 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
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
8. 5-30 minutes timer using IC 555
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.
NE5532 Pinout Datasheet Dual low noise op-amp
Transistor equalizer circuit diagram
LM317 Regulators CALCULATOR
0-30V variable Power Supply at 3A
0-50V 3A Variable power supply
Speaker protection circuit
Professional solid state relay circuit
200 watt MOSFET amplifier circuit class G
10 Key Code Lock Switch Circuit
9. Simplest Inverter circuit using transistors
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
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
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
13. LED Chaser circuits using IC 4017 + IC 555
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.
14. Dual LED Flasher using 2N2907
The Q1 and Q2 be Transistor PNP be usable general (2N3906,2N2907, etc.) Continue Reading>>
15. Simple music sound using UM66T
It uses just integrated one circuit and a loudspeaker, piezo buzzer, the small-sized, and have power supply 3V only. Continue Reading>>
These are just a few easy circuits diagram. If you want to look more circuits click here!
Not only that. Look More circuits below!
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