Simple electronics projects and circuits

jojo August 3, 2018 41 Comments

Simple Electronics Projects for Beginners

This article is a collection of simple electronics circuits we have published over a span of 3 years, which can be used as simple electronics projects for students, beginners, engineering students and other hobbyists. The following circuits listed below can also be used for your mini project needs. But we won’t recommend any of these circuits for your final year or main project requirements.

While selecting the circuits for this article, we have taken care to serve you with popular circuits on our website which are easy to implement.

The logic behind selecting popular circuits as projects are simple; just because of “comments by users”.  Comments refine a circuit by correcting many flaws and errors in the original design. We suggest you go through all the comments before practically testing any of these circuits which will save you a lot of troubleshooting time.

All of these circuits fall into the basic or small or hobby category and that’s why we used simple electronics projects as the title. And all these circuits are free of any patents and any other legal stuffs; you can experiment them at your own free will and creativity.

basic electronics projects

So here begins the list:-

1. Simple Water Level Indicator

Objective:- To measure the level of any conductive non-corrosive liquid.

We selected this circuit first because of its simple nature. This water level indicator circuit is easy to implement and is composed of least components. You only need 5 transistors, 5 resistors and 5 LED’s to implement this circuit; which makes it an ideal simple electronics project for beginners and students.

2. Automatic LED Emergency Light

Objective:- Implement a Lighting system/device using LED’s

This is another popular circuit which can be used for a simple project development. There are 3 versions available. One is developed by CircuitsToday team and other by Seetharaman Subrahmanian (a great contributor of CircuitsToday). Links are given to other similar circuit applications like LED ramp circuit, street light circuit, flashing led circuit etc.

3. Infrared Motion detector

Objective:- Detect Infrared rays. This circuit idea can be modified to design simple projects like Intruder alarm, Anti-theft systems etc.

A circuit application that everyone must try out. This circuit will teach you how to deal with infrared detection (transmitting and receiving), usage of 555 IC as a monostable multivibrator inside an application, usage of  IC’s like LM 1458 etc.

4. 7 segment counter project

Objective:- Learn the application of 7 segment display. (This circuit will teach you how to use 7 segment display for your future applications)

A simple electronic circuit that uses two IC’s – NE 555 (as an astable multivibrator to trigger CD 4033 IC) and CD 4033 for counting purpose. Apart from two IC’s and a 7 segment display (LT 543), the circuit uses a minimal set of components, 4 resistors, 1 capacitor and a diode.

5. Fire Alarm Project

Objective:- Detect fire in a given area and warn using an alarm system.

Though simple in nature this circuit will help you to understand how real-world electronics systems are built. This circuit is a basic one which senses smoke to detect fire and hence produce an alarm to warn people around. It uses an LDR to detect smoke (By default LDR is kept active by a light fall; smoke will mask the light and hence LDR resistance will increase), IC UM 66 as a tone generator, IC 7805 to drive tone generator IC and TDA 2003 IC as an amplifier to drive the speakers (alarm system).

6. Lead-acid battery charger

Objective:- To charge a battery.

So why not try your hands at charging a lead acid battery? Here is a simple electronics project that will let you charge your battery. This circuit is very simple in nature which consists of an LM317 IC (which provides correct charging voltage), a couple of resistors, capacitors and a potentiometer.

7.  Simple 10 Watt Audio Amplifier

Objective:- To design a 10-watt audio amplifier.

How can we avoid audio electronics projects? So let’s start our audio electronics journey with a simple audio amplifier project. As written in the objective, our aim is to design and implement a simple audio amplifier using IC TL081 (as a preamplifier). A much advanced audio amplifier project is given below.

8.  150 Watt Amplifier circuit

Objective:- To design an amplifier circuit and deliver 150 watt RMS to a 4-ohm speaker.

The first thing to mention is; above given project is the most popular circuit on CircuitsToday with live discussions going on (so far 563+ comments). We recommend you to g through all comments section to understand various problems faced by our readers while implementing this circuit. This will help you on your troubleshooting phase. So let us talk a little about this circuit. This is the cheapest 150 watt amplifier you can make using a pair of Darlington transistors TIP 142 and 147.  You have to go through the circuit design and description carefully as it will take a little bit of effort to get the desired output.

9. Simple Inverter Project

Objective:- To design a  simple 100 watt Inverter.

This is a simple low-cost inverter circuit which comprises of IC CD 4047 and two MOSFET’s IR540 as it’s main components. This circuit will teach you the basics of the common application we always use in building electronics devices.

10. FM Transmitter project

Objective:- To design an FM transmitter circuit which can transmit signals up to 2 kilometres.

How about designing a local FM station for your college? A station where students can air their programs (songs, speeches, solos) and all your college mates can receive them? Here is such an interesting project.  This is low-cost project which can be assembled using basic components.

So far we have covered 10 simple electronics projects for beginners, students and hobbyists. We will keep on expanding this article in the future with other interesting small and basic projects.

Latest Projects

1. Water Level Controller using 8051 Microcontroller 

Well, this is a fully functional water level controller made using AT89S51 (8051 compliant IC from Atmel) microcontroller from Atmel. This water level controller monitors the level of the overhead tank and automatically switches on the water pump whenever the level goes below a preset limit.

2. Voltmeter using 8051 Microcontroller 

This is another simple project using 8051 microcontroller, made using the same AT89S51 IC from Atmel. With this circuit, you can measure voltages in the range of 0 to 5 volts.

3. 250W PWM inverter circuit 

The objective of this project is to build a 250W inverter circuit using the IC SG3524. You have already seen above our project for creating a 100W inverter but this one is more difficult.

4. Simple function generator

A function generator is used to generate electrical waveforms of different frequencies. The most common waves this generated are sine waves, square waves and triangular waves.

5. Digital Thermometer

You know the function of a digital thermometer, it measures the temperature of a body and displays the output in a human-readable form. This circuit uses a 3 digit display to show the output. The temperature is sensed via contact using LM35 temperature sensor.

Some external resources are given below:-

1. A collection of Electronics Mini Projects

2. Amplifier circuits and projects

You can discuss your project ideas in our – Electronics projects community

  • Peter Joseph
    September 3, 2015

    I am very happy to visit your website,and I am about to start my project. so I wanted some help from you guys so that I can do it very well.My project will be Tester for Ultrasound Machine.Anyone to help me develop an idea of how to design a schematic circuit diagram.
    Peter J
    From Tanzania.

  • Sr££raj
    August 5, 2015

    I just liked ALL the circuits as the possision of resistors in each circuits.

  • SandhyaSri
    March 1, 2015

    Hii Sir I need A favour nd Sugestions,Ideas from u sir . Am dng My 2nd Yr ECE .. me nd my frdz are interestd to do mini projects using some simple circuit diagram representation nd wid electronic components like resistorz,transistors .m plz help me sir ..

  • ramadevi
    January 29, 2015

    sir idont know any thing abt projects now iam in 6th sem.
    plz give the step by step process of each little project

  • kalaiyarasi.M
    January 22, 2015

    sir, i’m doing 3 rd year 6 th sem…
    i have interest to do any projects …so i want to simple projects with steps to do ……pls help me… ….thanks sir….

  • […] Articles with reader comments for a number of projects, including a water level indicator, FM radio transmitter, and infrared motion detector. […]

  • September 23, 2014

    Excellent website for a newcomer. the information produced is essential, adequate as well as understandable for a fresher. the projects displayed are less in number. that is the only flaw.

  • lavanya
    August 15, 2014

    could you please some better mini projects and simple circuits

  • June 27, 2014

    thank you sir ,but I want a basic detail about electronic &electrical device using in project

  • subasree
    February 18, 2014

    sir,i am doing 3rd year ece .i want to do mini send me some latest topics

  • bittu
    January 28, 2014

    sir, I am a student of ec 8 sem and I want a some major project with ckt diagrams and
    clear explanation,so could you please give me
    such that projects,thanks sir

  • January 22, 2014

    make it simply

  • lokesh
    January 18, 2014

    i am stuidying 4sem diploma in electrical & electronics engg so i need a mini project of power electronics please help me sir also mail the details sir

  • pratyusha
    January 13, 2014

    sir can you please design a circuit for the generation of sine,square and triangular wave simultaneously using either dsp or microcontroller for frequency range 20khz to 1Mhz and amplitude level +5v to -5v

  • rohith
    November 21, 2013

    sir,i want simple street light circuit for the hobby project,so kindly mail me operation and work and circuit

  • Siva krishna
    October 7, 2013

    Sir,iam 3rd year btech student,i want some electronic mini projects with ckt diagrams and clear explanation,so could you please give me such that projects,thanks sir

  • October 1, 2013

    Good list of projects ideas have been published here. Especially the projects like Simple Water Level Indicator, Fire Alarm, Lead acid battery charger, Simple Inverter, FM Transmitter are very useful and interesting projects. Thanks for sharing these posts.

  • sam
    September 27, 2013

    please provide a simple semester project regarding optical communication

  • April 4, 2013

    In this fire alarm circuit, a Thermistor works as the heat sensor. When temperature increases, its resistance decreases, and vice versa. At normal temperature, the resistance of the Thermistor (TH1) is approximately 10 kilo-ohms, which reduces to a few ohms as the temperature increases beyond 100 C. The circuit uses readily available components and can be easily constructed on any general-purpose PCB.

    Circuit Diagram:

    Fire Alarm Circuit Diagram



    R1 = 470R
    R2 = 470R
    R3 = 33K
    R5 = 560R
    R4 = 470R
    R6 = 47K
    R7 = 2.2K
    R8 = 470R
    C1 = 10uF-16V
    C2 = 0.04uF-63V
    C3 = 0.01uF-63V
    Q1 = BC548
    Q2 = BC558
    Q3 = SL100B
    D1 = Red Led
    D2 = 1N4001
    IC1 = NE555
    SPKR = 1W-8R
    TH1 = Thermistor-10K

    Circuit Operation:

    Timer IC NE555 (IC1) is wired as an astable multivibrator oscillating in audio frequency band. Switching transistors Q1 and Q2 drive multivibrator IC1. The output of IC1 is connected to NPN transistor Q3, which drives the loudspeaker (SPKR) to generate sound. The frequency of IC1 depends on the values of resistors R6, R7 and capacitor C2. When Thermistor TH1 becomes hot, it provides a low-resistance path to extend positive voltage to the base of transistor Q1 via diode D2 and resistor R3. Capacitor C1 charges up to the positive voltage and increases the ‘on’ time of alarm. The higher the value of capacitor C1, the higher the forward voltage applied to the base of transistor Q1. Since the collector of transistor Q1 is connected to the base of transistor Q2, transistor Q2 provides positive voltage to reset pin 4 of IC1. R5 is used such that IC1 remains inactive in the absence of positive voltage. D2 stops discharging of capacitor C1 when the Thermistor connected to the positive supply cools down and provides a high-resistance (10k) path. It also stops the conduction of Q1. To prevent the Thermistor from melting, wrap it up in mica tape. The circuit works off a 6V-12V regulated power supply. D1 is used to indicate that power to the circuit is switched on.

  • Naveed Ahmed Siddiqui
    April 4, 2013

    Sir i am student of final year and please any help of 1 wire communication specialy for 1 wire addonly memory devices such as ds2505 or ds2506

  • chandu v v muralee gopi
    March 17, 2013

    sir, i want a one concept on converters to write an ieee paper please help me sir

  • pavithra
    March 11, 2013

    sir i am 4th semester student.i want some mini projects with clear explanation and give me some advice to develop my knowledge in electronics.

  • Jenil
    February 8, 2013

    Sir i want mini project using resistor,diode & capasitor so plzzz…. Give me some advice with explenation..

  • Mithila
    January 22, 2013

    sir please send me the abstract for gateway intruder alarm

  • vamshi
    January 6, 2013

    sir, i am a first year student. plz suggest a simple successful project and a website for projects

  • December 7, 2012

    Sir I’m student of bcs 1st smester i want any small circuit with explanation…..Thanxxxxxx

  • minhaj
    November 30, 2012

    sir i am 5th semester student please send me a small electronic project for learning

  • Gidado SIDI mustapha
    November 4, 2012

    im a final year student of electronics and my HOD insisted i should take SCR OVERVOLTAGE CROWBAR CIRCUIT as my project topic.Im suffering….i dont even know where to get ideas and materials from.THANKS

  • monisha
    September 8, 2012

    sir iam a first year btech student opted for i want to know amplifiers.

  • March 3, 2012

    sir please send me the detailed theory and abstract of the car anti theft wireless alaram system….

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