Ashutosh Bhatt

In this article I will explain a very basic circuit of Clipper using simple components. Clipping circuit is a wave-shaping circuit and is used to either remove or clip a portion of the applied wave in order to control the shape of the output waveform.One of the most basic clipping circuits is the half-wave rectifier. A half-wave rectifier clips either the negative half cycle or the positive half cycle of an alternating waveform, and allows passing of only one half cycle.

This power saving circuit is used to save electricity while ironing. The circuit will switch OFF the iron box when it is not in use. Once the ON time of the circuit is crossed, it will produce an alarm. If we press the Reset button at the time of alarm it will turned OFF the alarm and extend the ON time of the circuit to the next 4 minutes. This circuit will work as a reminder for those who always forget to turn OFF the iron box in this day to day busy life.In this circuit is build around NE 555(IC1), op-amp LM 358 (IC2) and few components. IC1 is designed as a standard monostable multivibrator and its trigger pin 2 is held high by resistor R1.LM 358 is configured as a comparator. Its non-inverting input (pin 3) and the inverting input (pin 2). Inverting pin 2 of IC2 is connected to voltage-divider preset VR1. Using preset VR1 we can vary the reference voltage at pin 2. Buzzer is connected to the output pin 1. Initially output pin 1 of IC2 is low.

The basic aim of this project is to transmit electric power wirelessly.Wireless Power Transfer (WPT) or wireless energy transmission is the transmission of electrical power from a power source to a consuming device without using solid wires or conductors. Wireless transmission is useful to power electrical devices in cases where interconnecting wires are inconvenient, hazardous, or are not possible.

A person’s inquisitiveness and curiosity can do wonders. It can open a realm of ideas and imaginations never thought before and create something worthwhile. When I was a child I used to read lot of electronic articles and magazines regularly. I’ve seen a lot of interesting circuits and tried as many of them as possible at that time. Whenever a new circuit catches my attention I can’t resist myself trying it out.

Main component of this circuit is IC NE555 timer.IC1 in this circuit works in astable mode. Other components that are used in this circuit are resistor, capacitor, LEDs and transistor.When power supply is on and switch pressed then voltage at pin2 and pin6 of IC1 drops. At the same duration voltage at pin3 of IC1 gets high and LED glows.For driving big quantity of LEDs (say around 50), a PNP transistor T1 (BD140) linked in the output terminal of the circuit.In this circuit we have used only 9 LEDs. We have divided the 9 LEDs in the group of three LEDs which is attached with 82 ohm resistor.

Up to this point, we were developing the basic functions into specific functional blocks according to their requirements. Let’s take a look at what all functional blocks we have, it will give you an idea how far we advanced in the designing processEach of the blocks shown above can perform their own specified functions only. The entire blocks should perform together to give us a collective output. It will happen only when we connect the blocks together in the proper way. Next we are going to discuss how to connect these blocks together so that we have a complete block diagram for the device. From the entire discussion so far you might already have a picture about the way of connecting these blocks together. The IR light from the TV remote triggers the working of the device and who receives the IR light pulses from the TV remote, the IR photodiode.  

Ever wondered how those crunch sounds come from the guitars of modern day Rock gods. Well, the answer to this is electronics. So let us go through the history of this “rock” sound. When electric guitars were invented, amplifiers in those days were tube amplifier which unlike today’s amplifiers used triodes or tube valve instead of transistors to amplify signal. The amplifiers in those days were big and bulk. And when they were played at full volume, they produce a “distorted” sound because the guitar signal got too amplified and hence clipped. The great guitarist Jimi Hendrix was the first guitarist to recognise that guitar and the amplifier together can be used as an instrument and started using this distorted sound to produce music. Thus rock music was invented.But tube amplifiers were unreliable, consumed lot of power and were expensive. Thus electronic engineers started to develop circuits which produced the same effect as a fully driven tube amp but were a lot smaller, effective and reliable. This gave birth to distortion pedals with transistors.

555 timer IC is highly used IC in the projects as it is low in price as well as provide high performance. You can find large number of projects on the internet made up of using 555 timer. Here is another simple project made with the help of 555 timer which can offer you hour of enjoyment.The project is made with the help of NE555 timer along with support of some other discrete components. The project which is shown here is clearly a triggering circuit and with the support of variable resistor VR1 in the project timing is adjusted.

In embedded systems, a simple function rarely exists alone. A simple pushbutton and LEDs controller is useful but if that controller cannot report when a user has pressed a button or share the status its LED indicate, the controllers are not worth their value. Many embedded systems include peripheral devices connected to the microprocessor in…

Light emitting diodes aligned in a form of matrix constitute a dot matrix display. It is commonly used to display time, temperature, news updates and many  more on digital billboards. Dot Matrix Display is manufactured in various dimensions like 5×7, 8×9, 128×16, 128×32 and  128×64 where the numbers represent LEDs in rows and columns, respectively.Arrangement of the LEDs in the matrix    pattern is made in either of the two ways: row anode-column cathode or row cathode-column anode.  In row anode-column cathode pattern, the entire row is anode while all columns serve as cathode and vice-versa pattern is there in row cathode-column anode. LED wafers are glued to the bottom of the segments and glow when powered ON. The  interesting part is that 35 LEDs are controlled by using a combination of 14 pins. Conductor tracks are laid all over the  board to power each LED. Let’s proceed to know in depth about how a dot matrix display works.  

Everything in today’s digital devices world is becoming a touch away. Whether it is filling an early morning coffee mug or setting the timer for washing machine or turning ON the display of your PC.Capacitive Touch Technology is widely used in touch sensing devices. Less time response and environment adaptive features made it popular between the manufacturers. Some more applications are water purifiers, kitchen appliances, vending machines and switches.Most of us have surely come across capacitive touch sensor in our day to day life but how many of us thought about the working principle behind it.Change in capacitance is used to sense the touch in capacitive display. Amazed? How can a two metal plate component which stores charge can sense the touch? Answer to the above question will be explored in this Insight. 

Explained here is an interesting circuit designing tutorial about impedance measurement of a speaker.  In speakers, impedance measurement forms a crucial part as it is always needed to get the perfect every time. From small earphones to the large bass woofers, one cannot expect sound to be too lousy or too sharp even at normal levels.  It, hence, becomes the responsibility of the circuit design to get the perfect sound delivered to our ears.  Interestingly, impedance variance is quite a common feature in speakers depending on their application. A telephone and a home theater system speaker would have totally different requirements in terms of impedance measurement. This circuit designing tutorial on impedance measurement describes basics with sounds, frequency and impedance. Further, a thorough detail regarding practical impedance measurement has been explained.  Explore all the technical details and find out how you can make yourself a master piece of a speaker through this impedance measurement process. 

Generally a 12V battery is expected to produce a 12V dc voltage all the time until it gets discharged. Practically, it is not possible and the output voltage of the battery decreases gradually as load connected to it draws current from it. So it is generally considered that if the output voltage of a 12V battery changes from 12V to 9V approximately, it is constant and after the voltage falls below 9V, it is considered to be discharged and need to be charged again. Any inverter designed to use with a 12V battery should be comfortable to produce a constant AC output voltage during the fall of battery voltage from 12V to 9v approximately. My point to say all these is that to monitor a 12V battery, it is sufficient to monitor the battery voltage from 12V to 9V range and a voltage below 9V should give a warning for LOW BATTERY VOLTAGE. Here for the development of the circuit, the 12V to 9V range is divided into 6 parts as 9V, 9.5V, 10V…11.5V. So 6 op amps are used to compare and display the appropriate level of voltage. The circuit is simple. Comparison is done between the two terminals of each op amp and accordingly output is shown. The series of resistors connected at the inverting terminals of each op amp makes a voltage divider and exact comparing voltage is supplied to each op amp.

TRIAC i.e. Triode for Alternating Current is a three terminal semiconductor device for controlling current. The TRIAC is an ideal device to be used for AC switching applications because it can control the current flow over both halves of an alternating cycle. The bi-directionality makes TRIACs very convenient switches for alternating current circuits, also allowing them to control very large power flows with milliampere-scale gate currents. It is possible to view the operation of a TRIAC in terms of two thyristors placed back to back.

There are different techniques to control speed of AC motor. One of the very popular of them is by applying chopped AC waveform – means changing phase angle of applied AC waveform. This method is used in many different devices likeThe firing angle of a thyristor like TRIAC – that gives supply to motor, is delayed to decrease the motor speed or it is fired earlier to increase motor speed. As firing angle is changed, the part of AC waveform applied to motor is chopped more or less. So the average AC voltage applied to motor changes – that changes speed of motor.

The circuit presented here operates a relay for Fixed Timer Interval. So the device or machine connected with relay operates for same time. The device once switched ON, automatically switches OFF after Fixed (set) Time Interval when relay switches OFF. The Time Interval can be varied and it is displayed on 7 Segment Display. This kind of circuits can be used in many applications where it is required to operate any device or machine for Fixed Time Interval.

Children like to watch cartoons movies or any other their favourite show  on the television and do not pay attention on their studies even at the time of examination.  So to keep eye on children we have design a parental control device. When the children in your home hold the remote of the television to on the TV or want to change channel and press any button of the remote then a loud sound would be generated by the device. And these will let you know that your child has  tried to switch on the TV. The main advantage of these circuit is that you can easily do your work without any trouble as it produces loud noise so you can hear the noise while working in the kitchen or while sitting in the nearby room.

The circuit presented here is used to transmit and receive low frequency pulses using IR modulator and demodulator. IR modulator takes low frequency pulses as input. It modulates them on 38 KHz carrier and transmits them through IR LED as 38 KHz IR light. On the demodulator side IR sensor detects (receives) 38 KHz IR light. It demodulates this 38 KHz pulses and recovers transmitted low frequency pulses. One pulse generator is built using IC555 to generate low frequency pulses. IR modulator is also built using IC555 and TSOP1738 IR sensor is used as IR demodulator. 

This is a very easy circuit . This can be employed in automobiles as a sequential indicate light. This circuit is constructed with the help of two ICs first one is a CMOS timer IC i.e. 555 timer and another one is the decade counter IC i.e. CD4017. In this circuit astable mode of the 555 timer IC is been used to trigger the counter. Also few other discrete components are used in the circuit.