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.
Toggle switch using CD4017
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.
Understanding Decade Counter CD4017
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.
Random Number Generator Using 7 Segment Display
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.
BCD to 7 Segment display Circuit
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.
Real Time Clock using 8051 Microcontroller and RTC IC DS1307
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”.
4 Player Quiz Buzzer
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.
Bathroom Light Off Timer
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…
IC555 based Multicolor LED Lamp Circuit Diagram
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…
Multipurpose Timer With Musical Alarm
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…
Wireless Switch Circuit Diagram
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).
UM3561 IC Based Security Alarm
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.
Understanding JK flip flop using CD4027
CD4027 is a common JK Flip flop based IC and if often used as data storing element. It contains two identical or symmetrical JK flip flop. Individual set of flip [[wysiwyg_imageupload::]]flop has provision of pin like set, reset, clock input, J, K and complementary outputs. JK flip flop can be used in applications like registers, counters or as control circuits. 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 signal applied to one or more control inputs and will have one or two outputs. In this output not only depends upon the current input. A flip flop is mostly used in computer for its memory circuit. In this circuit, both are opposite of each other for example voltage on Q bar is zero means Q should be having higher voltage.
Sound Operated Switch
Detailed here is a circuit which will switch ON the light by just listening your clap sound. Another advantage of this circuit is that you cannot get any electrical [[wysiwyg_imageupload::]]shock as we did not have to use any mechanical switch.The circuit is based on two IC :operational amplifier LM741 and JK flip-flop based CD 4027.An op-amp produces an output voltage that is hundreds of thousand times larger than the voltage difference between its input terminals .CD4027 is the master slave JK flip flop IC which work in toggle mode. Here, this IC can be used to change the state by 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 output namely Q and Q bar(Q not).
Water Sensor Circuit
This circuit is very sensitive to trigger and activate the audio visual alarm when wetness is sensed at its probes. This project is useful at homes to detect the water [[wysiwyg_imageupload::]]supply in the situations when the timing of water supply is not fixed. This circuit uses the 555 timer along with some sensor element which can detect moisture.In this circuit based project, 555 timer works in astable mode. It is driven by the emitter current which is coming from BC548 transistor as this transistor has high gain. In astable mode IC 555 functions as an oscillator. So for 555 to work in full oscillator mode a high current is required so as to trigger it. As the probes sense the moisture on it, the transistor gets switched ON and small current starts flowing between the base and the emitter. When no moisture is detected i.e. in dry state it remains OFF.
Single switch motor on/off.. Clockwise/anticlockwise
Shown here is an easy to construct electronic circuit through which a motor can be made to run in both directions i.e. clockwise and anticlockwise. An interesting [[wysiwyg_imageupload::]]fact that adds to the curiosity of the circuit is that this is done by pressing a single switch. This project finds a good application in areas of robotics. The commonly used H-Bridge circuit uses two control signals to control both the directions of the motor. Before we begin explaining the circuitry, let’s have some information about the H-Bridge circuit.H Bridge CircuitMainly used to control DC motors and stepper motors, H-bridge divides the voltage on the either side of the load. In this circuit, two IC555 timers form the H-bridge circuit around the motor. These 555 timers work in astable mode. Let’s find out more about how the circuit works.
CD 4027 Based Emergency Lighting System
Described here is a CD 4027 hearted, battery employed circuit that serves as a solution for light and fan during the times of extreme humidity or power cuts. The circuit consists of a LED light and small DC fan which can sufficiently work for one person. The main advantage of this circuit is one can use any one or both devices at a particular time. The circuit does not consume much power so one can expect it work for a good amount of time. This circuit is based on CD4027 IC which is the most commonly used JK flip flop IC. CD4027 is the master slave JK flip flop IC which works in toggle mode. Here, this IC can be used to change the state by signal applied to one or more control inputs and will have one or two outputs. In this circuit, output is only depended upon the current input.
LED Lamp Using CA3140 IC
Shown here is a low power consuming LED lamp circuit which starts to grow after light intensity goes below a threshold level of detection. This is not a switch [[wysiwyg_imageupload::]]based circuit, thus needs no human interference in order to turn it ON or OFF. Circuit is based on IC CA3140 which is a operational amplifier which combine the voltage of PMOS transistor with high voltage bipolar transistor on single chip, Light depending resistor(LDR) whose resistance dependent upon the amount of light falling on it and few more components. The circuit uses an operational amplifier CA3140 whose pins 2 and 3 act as inverting and non inverting inputs. Keep on reading to find out how the circuit is constructed and how it works.
Automatic Power OFF timer for CD player
Many people have habits to sleep while listening to music. So, device remains switched ON for the long durations which lead to wastage of energy. To avoid [[wysiwyg_imageupload::]]this, we have described a simple circuit which automatically become OFF after the set time. In this circuit, device become on while sensing the darkness , hence whenever you switch off the light, CD player connected to relay becomes ON and after set time it becomes OFF so there is no need to off the device as it turn off automatically so there is no wastage of electricity also.The circuit is built around the CD4060,LDR and few more components. IC CD4060 is a 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. LDR is a light dependent resistor its property depends upon the intensity of light falling on it.
IC 555 Based Message Display Circuit
Here is a simple circuit that displays a “HAPPY NEW YEAR” message. The alphanumeric display can be fitted anywhere in your home .The circuit is built around [[wysiwyg_imageupload::]]555 ICs, twelve KLA511 common-anode alphanumeric displays(IC1 to IC12) and a few discrete components. IC 555 functions as timer circuit and message is displayed for two minutes which is pre-determined by making the 555 work into monostable multivibrator mode. In this mode, one state of 555 based timer has a fixed duration, while other state surfaces up only when an interrupt is witnessed.KLA511 displays are a popular category of alphanumeric LED displays that consume low power and can work for longer duration without generating excess amount of heat. Each KLA511 unit comprises of 7 LEDs and has a common-anode circuit arrangement which along with some passive components, gives optimized display outputs. Keep on reading to find out how the circuit is constructed and what makes it work.