Top 8 Basic Circuits to Get Started with Electronics

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If you are interested in learning the basics of electronics and electrical engineering, one of the best way is to try making some electronic circuits and understand the concept behind their workings. There you can find a lot of simple electronics circuits on internet which explains the  concepts so well that while building the circuits, you will understand the fundamentals of the circuit building and electronic components. So here I have compiled a list of basic electronic circuits which  could be a great help to learn electronics.


1. Simple LED Circuit

Glowing an LED will not teach you a lot but it will be great help for you to understand the concepts of voltage and resistors. In addition, building your first circuit and get it working successfully will boost your confidence and motivate to move ahead with relatively more complex circuit.

A neater way to build your circuit. The yellow line shows the path through which current flows to a

You can find the DIY details of this circuit here.


2. Water Level Indicator

This is the most basic version of a water level indicator which starts an alarm when water level reaches to threshold. Although there are a lot of better version of this circuit but this one is undoubtedly the most basic one. By just using few resistors, transistors, LEDs and a buzzer, you can build this circuit by yourself and test in small water tank or bucket.

Simple Water Level Indicator Alarm Project

Find here the complete details for this water level controller circuit


 3. 7 Segment Counter Circuit

Now understanding the roles of resistors and transistors, you can move to displays. The simplest of display units is 7-segment displays. In this circuit you will also be using IC 4026 which is quite popular decade counter IC.

digital counter circuit

You can learn more about this circuit here.


4. Simple Preamplifier Circuit

Now moving on to audio section, you can develop a basic audio preamplifier circuit which will amplify a weak signal. By using transistors, you can do the amplification of audio signals and this concept is explained very well in this small project.

Simple preamplifier Circuit using Transistor

You can find here all the required details to build this preamplifier circuit.


5. Intruder Alarm Circuit

This circuit is a little bit complex one, it uses 555 timer IC and om-amp IC 741. 555 Timer IC and op-amp are important concepts to learn in electronics. You can go through the different articles to learn about the operating modes of 555 timer IC and uses of op-amp.

Intruder Alarm Circuit

To build this circuit, you can follow this project tutorial.


6. 555 Timer IC based Electronic Code Lock

Once you have understood the concepts of 555 IC, it will not be difficult to work on different operating modes of the IC. Here the 555 timer is configured in monostable multivibrator mode and used only few buttons, resistors and LEd along with a capacitor.

555 Timer Based Electronic Code Lock Circuit

Click the link to find our the details to build this simple code lock circuit


7. Light Theremin

This is another beautiful project made with 555 timer IC. Along with 555, an LDR, capacitor and speaker helps you to build this circuit.

Light Theremin

Check out this page on make magazine to DIY this circuit.


8. Simple Smoke Detector Alarm

Once you build all the above circuits you will get acquainted with basic electronic components and ICs. So now lets use a sensor and make something useful out of it. By using MQ2 smoke sensor, we can build a basic smoke detector alarm which will raise the alarm when it detects the smoke in vicinity.

Simple Smoke Detector Alarm Circuit

For more details, check out this smoke detector circuit.

Hope you like this list and will try making few of them!


Control A Lego Car Through Internet using Raspberry Pi

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You must have seen a lot of robotic projects using arduino or raspberry pi. But in this era of Internet of Things, when you are connecting every device with interent, wouldn’t you like your robotic car with internet?

Here is an interesting project on Instructables where a lego car made by raspberry pi is connected to internet and one can control to movement and direction of this car with internet. Check out the circuit diagram on breadboard:


Here is the detailed tutorial to make this DIY project

Raspberry Pi LM35 Temperature Sensor

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We have mostly covered all the Basic Components interfacing with Raspberry Pi in our Raspberry Pi projects section. We have covered all the Tutorials in simple and detailed manner, so that anyone, whether he has worked with Raspberry Pi or not, can learn from this Series easily. And after going through all the tutorials you will be able to build some High Level projects using Raspberry Pi.


So here we are designing first application based on the previous tutorials. The first basic application is a simple thermometer using Raspberry Pi in which you can monitor the Readings on computer.

Check out this complete project here

DIY WiFi Controlled Robot using Arduino

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There can be many different interesting robotics projects we can make with simple microcontroller boards. Here are few of simple projects you can try to build yourself, as they are easy to make and explained with details like circuit diagrams and codes required for the project.

 Here is another interesting project which lets you control the Robot over WiFi. For this we have used the WiFi module and interfaced it with the Arduino board to connect the robot with your cell phone.


For circuit diagram and complete tutorial to build this robot, visit here

DIY LED Cube Projects

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1. 5x5x5 LED Cube with Arduino Uno

Picture of 5x5 LED Cube (Arduino Uno)

This is a step by step explanation of how to build a 5×5 LED cube using an arduino. I did this project for my undergraduate electronics class and it took me about 2 weeks to complete.

2. 3x3x3 LED Cube using Arduino

3X3X3 LED Cube with Arduino UNO

A typical 3*3*3 LED cube connected with Arduino is shown in the final project image, shown above, the cube consists of 27 LEDs which are arranged in rows and columns forming a cube.

3. Raspberry Pi LED Cube

The basic concept is this; the cube, in this case 3x3x3, is made up of columns (9) and layers (3).On each layer, all the cathodes are connected together and in each column, the anodes are connected together. Therefore, 12 ouputs are needed to control all 27 LED’s.




Bluetooth Controlled Robo Car

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We have seen a lot of popular robotic projects like line follower robot, edge avoiding robot, DTMF robot, gesture controlled robot, etc. where simple automated robotic projects were developed using various controllers. In this tutorial a bluetooth controlled robo car is developed using popular open source development board – Arduino. Here a Bluetooth module is used to control the toy car, by using an android based application.


You can find the complete step by step tutorial to develop this project here. If you would like to see the toy-car working, check this video.

Metal Detector Circuits

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We can build a metal detector circuit by using different types of approach and by using different types of electronic components. Here I am sharing few metal detector circuits that I have tried with different controllers and IC.

1. Metal Detector using IC 555

In this project we are going to design a simple metal detector circuit. There are so many metal detector designs but most of them are complex in design so here we are going to design a simple metal detector circuit using 555 Timer IC. Check out here this complete metal detector circuit.

2. The “Blind Squirrel” Pulsed Induction Metal Detector

This is my version of a Pulsed Induction type of Metal Detector. I named it “Blind Squirrel” because even a blind squirrel finds an acorn every now and then.

This project came about when it was suggested by our club for the 2005-2006 winter contest.

3. Metal Detector

The circuit described here is that of a metal detector. The opera- tion of the circuit is based on superheterodyning principle which is commonly used in superhet receivers. The circuit utilises two RF oscillators.

4. Arduino Based Metal Detector

Build a cool looking and very unique metal detector with 5 separate search coils that light up when metal is detected. The search coil closest to the metal will light up better helping identify the location of the hidden treasure! Check out the project here.

After studying the various types of metal detectors and circuits that were available on the Web, I decided to design my own using ideas from previous designs as well as my own ideas.