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This circuit based project demonstrates the working of 555 timer in astable mode to generate pulses of time period 0.5 second. This pulse can be further used [[wysiwyg_imageupload::]]for anything where we need a pulse such as to blink a LED or to create fashionable blinking lights. This circuit of this project makes the use of timer IC NE555 which produces a constant square pulse of a desired frequency. This pulse could be either triggered or could be produced continuously depending upon the mode of 555 we are using. The two mostly used modes of 555 are Monostable and Astable. Here it is used in the astable mode with time period of half second, with high time period of 0.333 seconds and low time period of 0.166 seconds. Keep on reading to find out how the circuit is constructed and in what mode does the 555 IC works.
This circuit responds to the change in light illumination in the form of varying frequency which can be observed through a flashing LED as output. The idea of [[wysiwyg_imageupload::]]this project is to use an LDR in place of a fixed value resistor which in turn generates a particular frequency. The generated frequency corresponds to the light conditions of the ambience.This concept finds popular application in motor speed control where the output is connected to motor driver circuit. Disco light is another interesting application of the idea where the lighting pattern keeps on changing. The circuit of this project uses NE555 to generate a continuous series of pulses in astable mode. The frequency of these pulses is obtained based on values of two resistors and a capacitor. Keep on reading to find out more information on the circuit and its working.
This circuit and project demonstrates the application of 555 to generate negative supply. The negative supply produced is about 3 volts lesser than the applied [[wysiwyg_imageupload::]]voltage due to various losses. At times the circuit requires both negative and positive supply, which is not available in the batteries. IC555 includes two comparators, one RS flip-flop and other few discrete components like transistors, resistors etc. The biasing voltage (Vcc) is divided in three parts through voltage divider using same value of resistors R. from these 1/3 Vcc is given to non inverting terminal of trigger comparator and 2/3 Vcc is given to inverting terminal of threshold comparator. The outputs of both comparators are given to R and S inputs of flip-flop. The Q’ output is actual output of IC and Q output drives. In this project, 555 work in astable mode and produces a frequency of about 663 hertz.
The project on Seismic sensor circuit described here senses pressure variation or mechanical strain and responds by sounding a speaker. It can be used at [[wysiwyg_imageupload::]]prohibited places to alert any unwanted entry. Such sensors can be placed on the floors of these places and whenever an intrusion would occur, the speaker would go off. The term “Seismic” is used majorly for all the operations and processes related to the earth, its crust and lower layers. The similar areas are there where this sensor finds its applications: 1. Decoding natural vibrations under the earth’s crust through seismograph 2. Aid in large industrial processes of oil extraction drilling process, mining, tunnel construction etc.
The project about light sensor circuit shows the application of photodiode to detect the presence of light. This light sensor can be used as an intermediate circuit [[wysiwyg_imageupload::]]in various applications to detect the presence or absence of light. The sensitivity of the sensor can be adjusted using the preset. This circuit is based around a LM339 comparator along with variable capacitors, photodiode, LED and a solo resistor. A photodiode, used as a photo detector, generates current in the circuit when light incidents on it. The circuit of this project uses the photodiode in reverse bias mode with resistor R1. The LED at the output will glow when light falls on the diode. In such a condition, the inverting input drops to a lower value than the reference set at the non-inverting input and so the output goes providing the necessary forwards bias to the LED.
The circuit is used for decoration purpose or as an indicator. Flashing or dancing speed of LED’s can be varied with the help of variable resistor and various dancing pattern of light can be formed by slight change in the circuit. In this circuit 6 LED’s moves in one direction then again flow the opposite direction than previous. The circuit is based on two IC’s namely NE555 and CD4017 with few more components. 555 timer IC wired as an astable oscillator. In this circuit NE555 astable generates a clock for the circuit which provide a oscillating wave to the output pin 3 of IC1. You can vary the speed of oscillation with the help of VR1. The frequency of oscillation of 555 timer can be calculated by f=1.44/(R1+2*(VR1)*C1) and CD4017 is a CMOS counter/ divider IC. It take clock signal from the clock input and turn on the 10 output in sequence, each time when it receives clock input pulses. It is the most popular IC and extremely useful in various project like Light Chaser, Matrix Die. In order to understand the working of IC one must know about its individual pin.
Everyone has studied this rule in their childhood. It stands for “bracket, “off”, “division”, “multiplication”, “addition”, “subtraction”. A mathematical operation involve a number of operators but they must carry out in a particular order. The circuit described here will help you to practically implement the BODMAS rule which we have studied.The circuit is made with the help of three IC’s namely 7404, 7408 and 4073. 7404 is a hex inverter or NOT gate IC. It is a 14 pin IC and contain 6 individual NOT gate on a single IC. 7408 is a quad 2 input AND gate IC. It contains 4 individual AND gate on a single IC. 4073 is a triple 3 input AND gate. It contains 3 individual AND gate on a single IC. LED, switches and resistors are also used in this circuit.
The circuit is based on two IC’s namely NE555 and CD4017 with few more components. where 555 timer IC is wired as an astable oscillator. CD4017 is a CMOScounter/ divider IC which takes clock signal from the clock input and turns on the10 output in sequence, each time when it receives clock input pulses. It is the most popular IC and is extremely useful in various project like Light Chaser, Matrix Die.The circuit is based on two IC’s namely NE555 and CD4017 with few more components. where 555 timer IC is wired as an astable oscillator. CD4017 is a CMOS counter/ divider IC which takes clock signal from the clock input and turns on the10 output in sequence, each time when it receives clock input pulses. It is the most popular IC and is extremely useful in various project like Light Chaser, Matrix Die.
This circuit will help you to control two devices with the help of a switch. If you “on” the first device then second device remain “off”, and if you “on” the second [[wysiwyg_imageupload::]]device the first device will become “off”. Therefore you can control both the devices with the help of single switch. The circuit is built around CD4017 which is a CMOS decade counter/ Divider. Used in many applications like binary counter/decoder, frequency division, divide by N counting, Alarm system etc. CD4017 is a 16 pin IC which includes 3 input- Clock, Reset and Clock inhibit. And 10 output Q0- Q9. Pin 16 is for power supply and pin 8 is used for ground. Read more to find out working of the circuit.
CD4017 is a 16 pin CMOS decade counter/ Divider. It takes clock signal from the clock input and turns on the 10 output in sequence, each time when it receives [[wysiwyg_imageupload::]]clock input pulses. A popular IC, CD4017 is extremely useful in various projects like Light Chaser, Matrix Die. It is also useful in many applications like Binary counter/decoder, frequency division, divide by N counting, Alarm system etc. In order to understand the working of IC CD4017, one must know about its individual pins. It has 3 input pin and 10 output pin and one is ground pin and another is used for power supply and one is Carry out pin.
It is very simple and easy to construct project which will display random numbers from 0 to 7 on a 7 segment display. This circuit can serve as an alternative that can be used to replace the traditional dice while playing games such as snake ladder, monopoly etc. It uses NE555 which is a well known multivibrator IC. Here 555 timer IC is wired as an astable oscillator which provide a clock pulse to CD4017 IC.CD4017 which is a medium speed Johnson Counter that works at 10MHz and has 10 decoded outputs. CD4017 ICs are widely used in frequency dividers, binary counters, divide by N counters and register design applications and CD4511 which is a BCD to 7 segment decoder.
Many times we use LEDs in order to see binary outputs which are quite difficult to understand. The circuit described below will solve your problem as it will [[wysiwyg_imageupload::]]>display binary code on 7 segment displays, a very common and useful component of digital devices. It is based on CD4511, a CMOS BCD to seven segment latch/decoder and is used in various application like in clock, watches, computer, calculators etc. One thing to be kept in mind with this circuit is IC 4511 is used only for common cathode display. This IC provides the facility of 4-bit storage latch, an 8421 BCD-to-seven segment decoder. It also provides you the facility to check that all segments of 7 segment display are working properly or not (lamp test). For testing, momentarily make the pin low, in short used to test the display. Blanking input is used to turn off or vary the brightness of the display. Latch enable (LE) is used to store BCD codes.
A Real Time Clock (RTC) is basically just like a watch – it runs on a battery and keeps time for you even when there is a power outage. Using an RTC, you can keep track of long timelines, even if you reprogram your microcontroller or a power plug.The real time clock (RTC) is widely used device that provides accurate time and date for many applications. Many systems such as IBM pc come with RTC chip on mother board.RTC chip uses an internal battery which keeps time and date even when the power is off. In some microcontrollers have inbuilt RTC while others requires interfacing.Most widely used RTC chip is DS1307 from Dallas Semiconductor. It uses external lithium battery of 3V to keep operating for over maximum 10 years in the absence of external power supply.DS1307 uses CMOS technology to keep power consumption low. According to datasheet of DS1307 from Dallas, it keeps track of “Seconds, Minutes, and Hours, Day of week, Date, Month and Year”.
Described here is a simple electronic circuit which can be used in any test or quiz competition. Features of this circuit are:Whenever a switch is pressed, the [[wysiwyg_imageupload::]]circuit locks the remaining three entries. It has a master reset switch which allows users to press the switch next time once they have pressed. It can be powered from variable power supply ranging from 5V to 15V.Initially it may possible all or may two LED will be glowing for that you have to first clear the flip flop by pressing reset switch. Under this condition Q output of IC2 and IC1 become low.Continue reading to find out assembling and working of the circuit with video.
In this circuit 555 timer is wired as one shot timer whose timer period can be easily calculated by- T=1.1*R1*C1 Where T is in seconds, R is in ohms and C is in farads. When anybody wants to use the bathroom, it will press the switch momentarily. As soon as switch is pressed, relay connected…
NE555 astable generates a clock for the circuit, which provides an oscillating wave to the output pin 3 of IC1. You can vary the speed of oscillation with the help of VR1. The frequency of oscillation of 555 timer can be calculated by: f=1.44/(R1+2*(VR1)*C1) Now this wave is supplied to CD4017 decade counter pin 14…
The circuit is built around two IC namely CD4060 and UM66 with few more components. IC CD4060 is 14 stage ripple carry binary counter, divider and an oscillator. Its built in oscillator is main feature of this IC that’s why it can be used in numerous application like flasher, clock generator in timer circuits. UM66…
Normally, home appliances are controlled by means of switches, sensors, etc. However, physical contact with switches may be dangerous. The circuit [[wysiwyg_imageupload::]]described here requires no physical contact for operating the appliance. You just need to move your hand over the light dependent resistor (LDR). The device connected to it switches “on” when you put your hand over the LDR and remains “on” until you again move your hand over it.The circuit is based on two ICs: one is operational amplifier LM741 and JK Flip Flop CD4027. An op-amp produces an output voltage that is hundreds of thousand times larger than the voltage difference between its input terminals. CD4027 is a master slave JK flip flop IC which works in toggle mode. Here this IC can be used to change the state by the signal applied to one or more control inputs and will have one or two outputs. CD4027 has four inputs namely J, K, Set and Reset and it contain two outputs namely Q and Q bar (Q not).
This switch, when hidden under the floor mat, triggers an alarm when the person walks over it. Mat switch can be used as a security measure in a restricted area. [[wysiwyg_imageupload::]]Just put the switches beneath the mat after regular intervals so that when anybody who puts his feet on switch will engage the alarm.This circuit is built around the CMOS UM3561 IC which is mostly used in toys and alarms because of its low cost and power saving ability.One of the advantages of this switch is that the circuit does not consume the battery current in standby mode therefore lead to longer battery life. Also, you can also stabilize 9V DC mains adaptor in place of the battery. Read more to find out how the circuit is designed and how it works.