Harsha COMMUNICATIONS

Summary: This easy circuit complies 9 LED  attached like a “ knight rider scanner mode”. This circuit can employ in the front side of a car. It will present an eye catching look as the LED initially travel in the one way and then travel reverse in the similar direction. It means same as a pendulum it travels back and forth . This circuit can be utilized for the beautification of the car or it can be helpful at the time of crisis when your car broke down and you need help. Related Post: LED Christmas Lights Circuit Circuit Diagram of LED Knight Rider Circuit Diagram: LED Running Lights – LED Knight Rider Circuit Diagram Description: In order to get familiar with the working layout of the circuit it is important to get familiar with individual pin. This IC has 16 pins out of which 3 are input pin, 10 is for output purpose and for ground one pin is assigned and one power supply and rest one left is for Carry out. As shown below pin diagram of IC CD4017. ...

Summary: Did you ever think that how the street lights automatically turn ON in the night and turn OFF automatically at morning? Is there any person who comes to ON/OFF these lights? The following circuit that described below which perform this job automatically. This circuit employed the output from an uncomplicated light/dark activated circuit and oblige a relay in its output which can be further attached to switch ON/OFF a street light and electrical application in a household also. Many of the people have a phobia of darkness, so to assist them in such situation, we have explained a simple circuit . It will automatically turn on street light in the way of LED’s or bulb coupled with relay, it is well enough to see the object nearby. This circuit is very much easy to work and also the battery power consumed by the circuit is very low because of the very few components used in the circuit. Also Read the Interesting Post: Automatic Plant Watering Syste...

We know that bugger is a device which gives the information of one person to other person in the remote location. Normally bugger is used for finding out the status of the person like where he is going, what he is talking etc. This is illegal but most of spy agencies use this bugger. Here is small circuit with which you can listen to another people conversation from long distance using the normal FM radio set. This FM bugger circuit is kept in room where you want listen the conversation. You can listen to this conversation using the normal FM radio set. FM Bugger Block Diagram: From the block diagram we can easily understand that the message signal or conversation signal is modulated with the carrier frequency which is generated by the tank circuit . The message signal and carrier signal is modulated by the transistor and transmit the modulated signal in the air through the antenna. The modulated signal is received by the receiver antenna and gives to the FM rad...

The circuit which is explained below is been employed as an Electronic Letter Box. When letter drop by someone into the letter box then the LED attached at the output stops blinking which indicates that there is a letter in your letter box. To identify the presence of a letter in the box we have connected a LDR as well as source of light. LDR is a special kind of resistor whose action based on the intensity of light declining on it. In the time of total darkness LDR resistance is approx 1 mega ohm while at the time of bright light its resistance is 2-5 ohm. In this circuit the light source is adjusted with the LDR in such a way that the light will directly drop on the LDR so that when any letter comes inside the letter box it will chunk the light beam and LDR will be beneath darkness. Electronic Letter Box Circuit Diagram: Circuit Diagram of Electronic Letter Box Circuit Components : IC LM741 – 1 CD4001 – 1 Resistors R1(2.2M) – 1 R2(560K) – 1 R3,R4,R5(1K)...

Water is basic need in every one’s life. Saving and proper usage of water is very important. Here is an easy project which will give the alarm when there is rain, so that we can make some actions and save the rain water. As a result, we can increase the water levels of underground water by using underwater recharge technique. Rain water detector will detect the rain and make an alert; rain water detector is used in the irrigation field, home automation, communication, automobiles etc. Here is the simple and reliable circuit of rain water detector which can be constructed at low cost. Rain Alarm Project Block Diagram: Rain water sensor is the main component in the circuit. For this rain sensor, no need to go and buy in the market or online. We can do it ourselves just by taking the piece of Bakelite or mica board and aluminum wire. Bakelite or mica board should be made completely flat and aluminum wire should be pasted on the flat board as shown in the figure below o...

Introduction to Motion Detector: The motion detector is not only used as intruder alarm but also used in many applications like home automation system , energy efficiency system, etc. The motion detector will detect the motion of the people or objects and give the appropriate output according to the circuit. In general, motion detector uses different types of sensors like Passive infrared sensor (which will detect the motion of the person using the person body heat), microwave sensor (Microwave sensor will detect the motion of person by measuring the change in frequency from the produced beam), ultrasonic sensor (It produces acoustic signals which will detect the motion of a person) etc.  There are some motion detectors which will use different technology and include number of sensors (PIR, microwave sensor, ultrasonic sensor, etc.) to reduce the false triggering and increase the accuracy in motion detection. Here is the simple and reliable circuit which uses IR...

Multivibrator: Multivibrator discover their own space in lots of applications as they are among the most broadly used circuits. The application can be anyone either a household application or industrial or communication, etc. The multivibrator can also work in such type of application either as an oscillator or digital flip flop or pulse generator circuit or like a timer or I can be lay generator circuit and lots more. There are mainly three types of Multivibrators. They are Astable Multivibrator: It has actually no stable state. It has two quasi steady state which rapidly alters from one to another and again to the same state. So it’s mainly alters from high to low and from low to high devoid of any input trigger input after pre settled time. Monostable multivibrator: Out of two states, one is stable state and another one is quasi state. When trigger input is given, it switches from a stable state of quasi state. And it automatically switches to a stable state ...

This circuit alerts us when there is a fire accident at home by ringing a siren sound . You might have seen fire alarms earlier but this is quite different as it generates a siren sound instead of a buzzer and also it uses basic components to generate that siren sound. We are aware that there are many integrated circuits which can be used to generate the siren effect but we preferred to use basic electronics components like resistors, capacitors and transistors to generate it so that you will clearly understand the internal working of it and it will be much useful for you as you will gain more knowledge by analyzing it instead of simply going or pre designed integrated circuits. Circuit Diagram of Fire Alarm: Description: This circuit uses a thermistor to sense the temperature. When it senses that the temperature of the environment is increasing above a given threshold, then it gives a signal. The temperature at which the circuit detects fire can be adjusted ...

The main aim of this project is to operate and control the unmanned railway gate in the proper manner in order to avoid the accidents in the unmanned railway crossing. In a country like ours where there are many unmanned railway crossings, accidents are increasing day by day. These train accidents are due to the absence of human power in the railway. In order to overcome the accidents due to the above problem we have planned to design the project. Automatic Railway Gate Control System with High Speed Alerting System is an innovative circuit which automatically controls the operation of railway gates detecting the arrival and departure of trains at the gate. It has detectors at the far away distance on the railway track which allows us to know the arrival and departure of the train. These detectors are given to microcontroller which activates the motors which open/close the railway gate correspondingly. Another feature of this circuit is that it has an intellige...

Circuit Diagram of Automatic Door Bell Using Object Detection: This circuit operates using a pair of ultrasonic transmitter and receiver modules which are used to detect the person and then if the person is detected, the door bell is automatically turned ON when the person is in-front of the door. The ultrasonic transmitter operates at a frequency of about 40 Kilo-Hertz. That means it continuously transmits the ultrasonic waves of about 40KHz. The power supply should be moderate such that the range of the transmitter is only about one or two meters. If the transmitting power is less than one meter, then there is a chance that the person who is one meter away is not detected. Also, if the range is set to be very large, then it may lead to false triggering, meaning that, the objects far away from our door are considered as the visitors and the alarm rings. This can be a nuisance for us if the alarm rings for every object or person far away. So, to avoid both the ...

Simple Mobile Jammer Circuit Diagram: Simple Mobile Jammer Circuit Diagram Cell Phone Jammer Circuit Explanation: If you understand the above circuit, this circuit analysis is simple and easy. For any jammer circuit, remember that there are three main important circuits. When they are combined together, the output of that circuit will work as a jammer. The three circuits are RF amplifier. Voltage controlled oscillator. Tuning circuit. So the transistor Q1, capacitors C4 & C5 and resistor R1 constitute the RF amplifier circuit. This will amplify the signal generated by the tuned circuit. The amplification signal is given to the antenna through C6 capacitor. Capacitor C6 will remove the DC and allow only the AC signal which is transmitted in the air. When the transistor Q1 is turned ON, the tuned circuit at the collector will get turned ON. The tuned circuit consists of capacitor C1 and inductor L1. This tuned circuit will act as an oscillator with zero resi...

Introduction: While parking the car the driver should be more careful because he cannot see the back of the car while parking or taking reverse, if there is any obstacle and ran over it might be  get damage to the car. Our project will help the person in the driving seat and give alarm if there is any obstacle or a wall while parking or while driving in reverse. Block Diagram of Car Parking Guard: The IR sensor will detect the obstacle with in 100cm, if there is any obstacle it will sense and give information to the tone detector which will enable the LM555 timer to generate a PWM for the buzzer. The LM555 will generate the pulse which helps to buzz the buzzer so driver can understand that there is an obstacle. Main Component Explanation: LM567: is a tone detector which can interpret the frequency generated by the other component and give the output according to the application designed by the engineer. For example if a component is attached to the input o...

Generally appliances that we used in our home are being controlled with the  help of devices like switches, senors. However sometimes it is dangerous to have physical contact with these switches. So to overcome these dangers, here we have explained a circuit that needs no physical contact with the appliance. In these circuits all you  need is to pass your hand  above LDR. As you first pass your hand over LDR the device connected with  it started and remain in that state till you again pass your hand above LDR. These circuits are mainly depending on two ICs. First one is LM714 which is an operational amplifier. These IC is used to increase the voltage level at the output hundred  of a thousand times as compared with  the input. Another one is most generally used JK flip flop i.e. CD4027. These IC works in toggle mode and based on the JK flip flop master slave concept. This IC is used to alter the state when the signal is given to the any one...

In this circuit, at the starting LED glow slowly, then grown brighter and once again slowly it became dim. The basis of the whole circuit is an operational amplifier IC named LM358. Circuit Diagram of LED Lamp Dimmer: LED Lamp Dimmer Circuit Diagram – ElectronicsHub.Org Working of LED Lamp Dimmer Circuit: LM358 is mainly made up of a package which contains two not dependent operational  amplifiers of high gain. The most significant attribute of these IC is that we have no need of the  independent power supply for the functioning of each comparator till the large range of the power supply. LM358 can be employed like transducer amplifier or can be worked as DC gain block etc. The huge DC voltage gain of the LM358 IC is 100db. For the only power supply this IC can work on the voltage range of 3V to 32V while for the twin power supply this IC work on the range of ±1. 5V to ±16V . And moreover large output voltage is also supported by it. Related Post: PWM L...