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 guide, we’re building a fun project (well, ‘tweet’ generating circuit is obviously fun to build, but tweet crossover reduction is purely geeky!)Â – which is a Tweeter Crossover Circuit. This simple design is developed using two capacitors and a potentiometer. Very easy to build and you gain lots of concepts in crossover reduction
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
Multi-Tone Alarm This multi-tone alarm circuit will help you create a burglar alarm that will not only alert you of intruders but will also play a different tune each time an intruder comes, this makes sure that no regular intruders will have to listen to the same boring tone again and again! 🙂 Kidding aside this
Audio Distortion Meter An audio distortion meter is used to measure distortions in, yes you guessed it right, audio. At certain frequencies the sound from most audio devices distorts, they become unclear. Of course, the frequencies and the level of distortions vary from device to device. A distortion meter helps to find the level of
Scream Generator Circuit Scream generating circuit? Well actually this is a simple sound generator circuit, but of course, you can create a screaming sound with it. It has unlimited possibilities in pranks and Halloween, just use your imagination. It works like a car horn or a doorbell but intensity increases the more you keep it pressed.
Audio Watt Meter How do you measure the power output of an amplifier? using an Audio Wattmeter. the name Audio Watt Meter’ is a collective name for all devices that are used to measure the output of an amplifier, so many kinds of equipment fall under this category. What we intend in this project is
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
Dual Tone Train Horn Circuit – Description A dual tone train horn simulator circuit can be made using two NE 555 timers connected in cascade. Here instead of using two NE 555 timers a single NE 556 timer is used which is nothing but cascading two 555’s in one package and each timers works independently.
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
Power Amplifier Circuit – 25 Watts Here is the diagram of a 25 Watt power amplifier circuit made of TDA2009 IC. TDA2009 IC is a hi-fi Class AB stereo amplifier in a multi watt package. It is actually a dual audio power amplifier that is designed specifically for very good quality stereo applications. TDA2009 is
Metal Detector Circuit I always wanted to make a metal detector seeing how cool it was in all Hollywood, Bollywood movies. One thing I realised is; things aren’t as difficult as you think it is. After all, I found that a metal detector is really simple and easy to make. So in this post, I
In this project, we’re building a simple Lamp Flasher circuit using NE 555. A lamp flasher is nothing but a lamp dimmer circuit – where the lamp is turned ON/OFF at set frequency or time intervals. We’ve designed this circuit using the most popular and common components like the NE/SE 555 IC. Let’s begin our
In this project guide, we’re building a Touch Switch Circuit using NE 555 IC. As you know, NE/SE 555 is a very popular timer IC with multiple applications in different projects. A touch switch is basically a simple switching circuit activated upon a touch. If you’re new to 555 IC, please take the time to
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
In this project, We’re building a Photo Switch Circuit using 555 IC. If you’re not familiar with the term ‘photo switch’ – this is nothing but a light-activated switch. The switch will turn ON/OFF based on light intensity. We’ve designed this photo switch circuit using simple & popular components. The heart of this circuit is
In this project, let’s learn about automatic wiper control using NE555 IC. As you all know, NE/SE 555 is one of the most common timer IC ever created in the world. There is absolutely no electronics enthusiast who has never played with the 555 IC. We’ve extensively covered 555 IC, where we have a big
