Simple projects
Today I have gone through a book Practical Electronics for Inventors written by Paul Scherz, which describes the various practical circuit ideas and designing techniques.Its 585 page big book with all basic ideas related to electronics. I am reviewing and recommending this book here,because I am getting tons of comments from newbies in electronics asking […]
Simple Battery Level Indicator Description Here is a easy to build low battery level indicator circuit that produces a visible indication by flashing a LED when the battery voltage drops below a predetermined voltage.The circuit is based on Panasonic’s IC MN13811G  and a efficient flasher based on transistors Q1&Q2.Here when the battery voltage drops below
Simple AM Transmitter Transmitters are devices that are capable of transmitting audio as radio waves from an audio device. There are two types of transmitters; FM & AM. We have many posts on FM transmitters, so we decided to make one on AM transmitter. AM transmitters create radio waves using Amplitude Modulation (that’s why AM).
Single chip FM transmitter An FM transmitter is a device that can transmit audio from an audio device as a radio signal. Doing so allows the audio to be picked up and played by an FM radio in the transmitter’s range. The FM (frequency modulation) device allows the waves to move in predefined frequencies so
Low Cost 150 Watt Amplifier Circuit In this project, we’re building a simple 150 watt amplifier circuit. Description This is the cheapest 150 Watt amplifier circuit you can make,I think.Based on two Darlington power transistors TIP 142 and TIP 147 ,this circuit can deliver a blasting 150 W Rms to a 4 Ohm speaker.Enough for
100 Watt Inverter-Circuit Diagram, Parts List & design Tips Inverters are devices that convert DC input supply to AC (alternating current). They are also called power inverters. Power inverters have numerous applications in power electronics field. It is used in various applications like induction heating, UPS, controlling electric motors, refrigerators, solar and many more. A
Remote control tester Circuit Description This is a simple remote controller tester circuit based on infrared sensor IC TSOP 1738. When the IR waves fall on the sensor it output changes to low state. This makes the transistor Q1 (BC558) ON and LED will blink according to the code contained in the signal. So for
In this project, let’s build a simple Remote controlled switch for appliance controlling. If you know basic concepts of electronics, this circuit is pretty easy to build and test. The core of this circuit are two IC’s – which are infra red sensor IC’s – TSOP 1738. A couple of transistors and associated components complete
In this article, we list different burglar alarm circuit and projects we have designed and published in CircuitsToday. A burglar alarm is basically an intruder alert system used to prevent theft/robbery and protect one’s premises. Burglar alarms or alert systems can be designed in different ways; from very simple sound alarm system to the advanced
In this circuit tutorial, we’re building a simple Function Generator Circuit which can generate waveforms – Sine waves, Square waves and Triangular waves. The core of this circuit is IC L8038 – which is basically a function generator chip capable of generating different waveforms. Description. The ICL8038 is a function generator chip, capable of generating
In this article, we teach you how to design a simple Lead Acid Battery Charger circuit using an op-amp IC and some associated components. The core of this circuit is IC LM 317 – which is basically an operational amplifier IC. Apart from the IC, a transistor (BC 548) is used to control the charging
Super light Sensitive Intruder Alarm Circuit Intruder alarms are popular devices used in high-security areas as well as civilian houses to detect and alarm the presence of any intruders. There are different kinds of intruder detection alarms, some detect movements by using a laser, some use pressure variations etc. Our intruder alarm works using an
In this project, we’re building a Single Chip FM Radio. The heart of this circuit is a digital IC – TDA7000. The design involves proper use of inductors and capacitors with correct values. Since the IC is dedicated to build radio circuits, this circuit is very much reliable to an extent. Description. Here is a
In this project circuit, we’re building a Direct Coupled Radio Circuit using an inductor and 3 transistors mainly. This is a very basic, low cost, hobby purpose circuit – just for the learning purpose of “direct coupling” method. If you’re looking for a good radio circuit, you’d be better off with our FM Radio Circuits
In this guide, we are designing a Liquid Level Switch using 3 transistors (BC107), some passive components, a diode and a couple of relays. This is basically a level sensing circuit designed using minimal components. If you’re looking for an efficient level sensing circuit, you would be better off with our water level controller circuit.
In this project guide, we’re doing a simple Musical Light Chaser circuit using two digital IC’s and some associated components. This is basically a hobby circuit, which you can build for Halloweens or Christmas decorations. Description Here is a simple state of the art musical chaser circuit that can be used in discotheques or even
In this project guide we’re building PWM Motor Speed Control circuit using two digital IC’s. We’ve published different types of PWM circuits, say from the basic PWMÂ using NE 555 IC, to the much advanced PWM using micro controllers like AVR, 8051, and Arduino boards. PWM – is basically pulse width modulation and if you’re new
Doorbell Circuit Description Related Posts: Melody Generator using UM 66 Door Bell Circuit Using NE555 The main objective of the doorbell circuit is to convert electrical signals (input) into audio signals (output) with a single press of a switch. The circuit given below is a modified version of the Melody Generator Circuit, whose link
Seven Segment Counter Display Circuit Description Here is the circuit diagram of a seven segment counter based on the counter IC CD 4033. This circuit can be used in conjunction with various circuits where a counter to display the progress adds some more attraction. In this circuit a 7-segment display is connected with two NE555
Car Battery Voltmeter Circuit Description The main onjective of the car batter voltmeter circuit using LED is to work as a warning inducator using a voltmeter circuit to test the life of car batteries. A voltmeter, though can be bought from a store, is designed as a circuit to make the whole arrangement a lot
How cool is it to design an Automatic Car Head Lights Turn Off Circuit? Well, I’ve always fascinated myself by playing with car electronics. And today is my day! I’ve come up with a really cool circuit, where you can turn the car headlights “OFF” after a preset time. This cool circuit is designed using
Simple Radio Circuit Op-amp is the short form for Operation Amplifier. It is a device used to amplify voltage, and is very popular due to its high gain amplification. It can often amplify voltage to hundred times of what is input. This project is aimed at making a simple radio circuit using an opamp. Description
19 Watts Simple Amplifier Circuit This is a 19-watt simple amplifier circuit diagram using IC LA4440 from Sanyo. It uses very fewer components other than the IC LA4440. A very high-quality circuit with respect to its cost and ideal for beginners. Here IC LA 4440 is wired as a bridge amplifier to deliver a 19
InfraRed (IR) Sensor/Detector Circuit The IR circuit described below is mainly designed for liquid level detection or proximity detection. The IR sensors used here are an IR LED and an IR photo diode. The circuit operates by detecting the distance from the target by reflection of an infrared beam. The biggest advantage of this circuit is
The light dimmer circuit or fan regulator circuit (either case, the circuit, and design are the same, the only difference is the output load to be varied, that is, fan or light) is used to control the brightness of the light or the speed of the fan according to our desire. The objective of the
