SiteMap: Published Articles


Categorised List Of Articles At: E-Prerna.Com

  Newsletter At: Campaign 

Current Affairs [5]

(1)  5 Reasons Why Android Phones Beat iPhone 5!

Android really has come edgy technology that makes it beat the iPhone 5 pretty easily. Lets sneak peek.

(2)  Warning: Don’t Use Social Networking E-mail ID For Banking

Are you using a common e-mail ID for all your social networks like Facebook, Twitter as well as for banking? If yes, you are at risk. Find out why.

(3)  BJP Website Hacked By Anonymous 

The Bharatiya Janata Party’s website was compromised on Tuesday night. Lets know how.

(4) Windows 8 

The latest operating system from Microsoft has been well received since its announcement last Friday. Let’s dig in.

(5)  Engineering Campus Hiring 

Expect A Drop In Engineering Campus Hiring In 2013 . Let’s sneak peek.

Comic-Con [7]

(1)  Shinchan

A Japanese manga and anime series, Crayon Shin-chan [Video] [Comic-Con].

(2)  ALF Tries To Eat The Cat !!

American science fiction sitcom, ALF (an acronym for Alien Life Form) [Video] [Comic-Con].

(3)  Pingu

A Swiss stop-motion claymated television series, Pingu [Video] [Comic-Con].

(4)  Toon Zone

Cartoon Strip  For Comic Lovers [Comic-Con] !!

(5) Seinfeld: Drunk Cosmo Kramer

Seinfeld is an American television sitcom created by Larry David and Jerry Seinfeld [Video] [Comic-Con].

(6) Mr. Bean – At the Dentist

Mr. Bean, “a child in a grown man’s body”, is a British comedy television programme series written by and starring Rowan Atkinson as the title character [Video] [Comic-Con].

(7) The Big Bang Theory

An American sitcom created by Chuck Lorre, Bill Prady, and Steven Molaro [Video] [Comic-Con].

Education & Society [42]

(1)  Caged Canary And Chained Dog

This article helps us to awake from our slumber and stop the cruelty against animals and birds.We (humans) hold the sense of justice so ‘dear’, but it should be extended to ‘all creatures’.

(2)  The ‘WildLife’- Rare And Unusual

Lets see what Mother Nature has in store for us. There’s so much to learn from her.

(3)  How To Suck At Your ‘Religion’ ??

Does your religion inspire you to help others or does your religion hinder ‘in the name of GOD’?

(4)  Me And My Boss   

This article brings out the differences between employees and employers…

(5)  Rules for Supervisors

Every word of this article is laced with tinges of humour and sarcasm that brings out traits of ”Supervisors” ;-)

(6)  The Ten ‘Ifs’ of Employment

Follow this advice and you will go far…

(7)  The Interviewer !!  

This article contains awesome answers that were given by a candidate in INFOSYS Interview.

(8)   Awesome Answers In IAS Examinations 

This article contains few fantabulous answers that were given in competitive examinations.

(9)  The ‘Real’ ‘Man’ 

This article intends to portray that  “a real man treats his lady the same way he wants another man to treat his daughter.”

(10)  Is “Hell” Exothermic or Endothermic?? 

This article unveils whether “Hell” is exothermic (gives off heat) or Endothermic (absorbs heat) . This article is a rhetoric satire with a tinge of scientific humor.

(11)  I’m a “honest and positive person”… in my resume !!!

This article is a rhetoric satire that tells how hypocrite peeps behave ‘differently’ on- and -off screen..

(12)  Teacher’s Day In India !!

This article sneak peeks into the celebrations of Teacher’s day in India.

(13)  WHAT’S YOUR DREAM JOB ?

This article provides career guidance.

(14)  Just a Rupee 

This is a rhetoric, satirical poem that justifies the proverb “beggars are not choosers”.

(15)  Today I Heard a Bird Sing !!    

This is a rhetoric, satirical poem that intends to dawn upon us that how we, as humans, are better than animals & birds, but, still posses a complaining and ungrateful attitude in life.

(16)  The Ladder Of A Successful Career !! 

This article enlightens the barriers that women face while climbing up the ladder of a successful career.

(17)  And The Winner Is ??  

This article focuses on the ” herd” that heroically and swiftly boards the metro train and “fights” for who grabs the seat “first” .

(18)  Everyone Hails, ‘Long Nails’ !  

This articles highlights unhygienic conditions and unhealthy issues on letting one’s nails grow too long.

(19)  Excuse Me, Excuse Me Not !! 

This article contends that saying “Sorry” or “Excuse Me” does not give one a license or a right to walk all over others.

(20)  Pole Dance 

This article focuses on “uneducated literates” who travel in public transports.

(21)  Animal Rights 

This article protests the experiments done on animals (e.g., laboratory rats).

(22)  Rules Are Meant To Be Broken! 

The gist of the article is that people “follow” rules only in 2 conditions (1) when scared hell out of them, thereby, left with no option, and hence, are forced to abide by the regulations (2) inner willingness and discipline to follow the rules….

(23)  Summer Trainings in India

This article explains and justifies why industrial trainings are important.

(24)  Is Education today nothing .. But the learning of facts ??

This is a debate on the topic : whether today’s Education System focuses on mugging up facts, and, getting good marks, or not.

(25)  My Experience

Author has shared her experience here.

(26)  Examine ‘what’ is said, not him ‘who’ speaks.

Top 1000 proverbs (A-Z) are enlisted in this article.

(27)   Legal Recognition of Lesbian and Gay Relationships   

Does any state recognize marriages between same-sex couples? Lets sneak peek.

(28)  How The English Language Has Evolved Over Time 

The history of the English language is long and complicated. However, there are several major milestones throughout its evolution which make it what it is today. Lets find out.

(29)  Compare The Genders !! 

Differences Between Men & Women :-p

(30)  Are women better managers ?? 

This is a debate. “A group of donkeys led by a lion can defeat a group of lions led by a donkey.”

I, myself being a woman, believe that men are better managers!!

(31)  Heart Of An Angel And Height Of An Elephant !!!

Let’s see who can decode and unveil the profound meaning of this statement …

(32) Why I Write

I write because I want, maybe even by accident, to write something beautiful [Read More].

(33) The Fringe Benefits Of Being A Writer   

What exactly do you earn by being a writer? Let’s sneak peek into the perks of being a writer.

(34) Artists And Writers

Anybody can look at a pretty girl and see a pretty girl. An artist can look at a pretty girl and see the old woman she will become. Let’s see the portray of lady.

(35)        Where Are You?     

Which step have you reached today in the ladder of “I can and I can’t”? Keep climbing till you reach “I did it”!

(36)  My Secret Life on the McJob

The findings of  Jerry Newman and the lessons he learnt from behind the counter that guarantee to supersize any management style.

(37)  The Disney Way  

Find out how you can harness the management secrets of Walt Disney in your company that yields startling performance improvements.

(38)  The 17 Vices

This article enlists 17 vices with their dictionary meanings (in alphabetical order).  Keep these evil attributes at bay.

(39) I L U

Love is not a noun but a verb to be acted upon!

(40) Portrait Of A Lady [Artwork]

A painting by me, of course !!

(41) Thought For Diwali [FooD For Thought]

Side effects of Diwali: noise and air pollution !!

(42) Rangoli [Artwork]

Rangoli by me, of course !! [The festive mood of Diwali]

Technical Articles [27]

(1)  Purpose of ‘Equipotential Bonding’

Find out significance of Equipotential bonding in an electrical installation.

(2)  ‘Surge’ Protection of Electronic Equipments

This article elucidates concept of surge protection zones (SPZs).

(3)  Adaptive Control

This article explains concepts related to adaptive control in control systems.

(4)  Transducer 

This article briefly elucidates transducers. It also enlightens classification of transducers along with their applications.

(5)  Analog Data Acquisition with Transducers 

This article describes relation of transducers and transformers for acquisition of analog data.

(6)  What is a PID controller?

This article demystifies ‘PID controller’ concepts.

(7)  Automation : PLC And the Ladder Diagrams

This article demonstrates ladder logic in PLC.

(8)  Transformers Connected Directly to Generators

This article suggests designs for withstanding the abnormal thermal and mechanical aspects in power transformers.

(9)  The Spiritual Rebirth Of The Flip-Flop!!  

Learn Flip -Flop Conversion via this article.

(10)  Top Embedded Companies

This article enlists top 30 embedded companies (in India  and all over the World).

(11)  Electronic Design Automation (EDA)

This article clarifies all your doubts related to ‘EDA’.

(12)  Electronics for you (EFY)  

‘Waterless’ Washing Machine ! 
New inventions have made strainful works always easier for people. Find out how the ‘waterless’ washing machine is a blessing.
Find out at EFY .
Pls search by entering the “title” of the project in the search box.

(13)   EFY Plus DVD   

Take Feature Tour of  EDA and engineering tools via monthly issue of EFY DVD.

(14) How To Control A Mouse Via TV Remote ??

Learn how to control your PC via TV Remote. The circuit is based on 8051 microcontroller and is coded in Visual Basic. Find out the two modes of operation.

(15) Harry Potter And The ‘Ionisation Chamber’ !!

Find out how to construct an ionisation chamber. Also learn how a PicAXE-08M microprocessor can measure the voltage drift rate of an ionisation chamber.

(16) ‘Revenge Is A Dish Best Served Cold’ 

Do you have an incessant channel hopper that is driving you crazy? Teach him a lesson with ‘TV Remote Control Jammer’ circuit.

(17) Water-Water Everywhere….

Find out how this ‘Dripper’ gag works best in dark , especially when your ‘victim’ is about to fall asleep.

(18) Wollah…Gags And Illusions…

Create illusion with the ‘magic lamp’ that lights up with mere finger touch.

(19) Lord Of The ‘Showers’! 

Do certain members of your family enjoy long, warm showers, especially when you are in its utmost need? Its high time for your revenge! Sneak peek into this ‘sadistic circuit’ that cuts off the hot water in showers (bathrooms).

(20) ‘Waterless’ Washing Machine!  

New inventions have made strainful works always easier for people. Find out how the ‘waterless’ washing machine is a blessing.

(21) Filters – Active, Passive, and Switched Capacitor 

What do you mean by a ‘filter’? How can it be classified? What are its applications? Let’s explore.

(22)  How important is soldering?

Say it with me – ‘Yes, I really can solder that’! Yes, you really can solder that and anything else. This article includes basics of soldering. What’s soldering flux? Find out the rules for good soldering.

(23) Teenage Romance: Like forces repel and unlike forces attract

This article explains electron theory and atoms. Find out why like forces repel and unlike forces attract each other.

(24)  Happy Birthday ‘Semiconductors’

It has been a century (100 years) since the discovery of Superconductors. Read this article to know milestones achieved up till today.

(25)  5 Design Ideas For Electronics

Find out how highpass filters modify equal-element design, how position detectors provide motor-control logic, how bipolar transistor boosts switcher’s current by 12 times, how op-amp load is cancelled by negative resistor, how to make repeatable JFET circuits via op-amps.

(26)  7 Design Ideas For Electronics

Find out pros and cons of rotary switches and pushbuttons, how simple FIFO is realised via FPGA, how can you get constant current for ISFETs/MEMFETs, how temperature can be measured by USB link, how single-sideband demodulator covers the HF band, how voltage reference improves JFET, how wideband filters use image parameters.

(27) Sensors: I Know What You Did in Last Measurement!

Lets see how a sensor/detector measures a physical quantity and converts it into a signal which can be read by an observer, or, by an electronic instrument.

Science & Research [13]

(1)  Wireless Charging: Wireless Power Consortium

This article elucidates how electronics devices (like mobile phones) can be  ‘wirelessly’ charged. This article also enlightens ‘Wireless Power Consortium’  that aims at new industry standard for low-power ‘inductive charging’ called ‘Qi‘ (pronounced chee).

(2)  Global 450 Consortium (G450C) Program 

This article elaborates about G450C Program that aims to support the industry transition from 300mm wafer to 450mm wafer production.

(3)  Top Personalities of the World : Sunita Williams

This article is about Ms. Sunita Williams, who is a United States Naval officer and a NASA astronaut.

(4)  Galileo Galilei  

This article re-tells travails and trials of the first “real” experimental scientist, Galileo Galilei.

(5)  Happy Engineer’s Day !!

This article is an insight into Celebration of Engineer’s Day.

(6)  Solar energy is free, but what does it really cost?

This article sums up technical obstacles in solar industry.

(7)  Biodiesel : Myths and Facts

This article demystifies facts and myths about biodiesel and provides us a clear image of present scenario.

(8)  Science Scope

This article illustrates how all branches of engineering are related to each other.

(9)  Why ‘Algebra’ Is Not Scenic As A ‘Zebra’? 

This articles introduces “algebra” and its applications.

(10)  Titanium

This article explains properties of “Titanium” and its various applications.

(11) The Genie in the Machine

‘Invention’ and ‘discovery’ are two unique traits of human brain. We all know how ‘assembly lines’ have automated the ‘process of manufacturing’. Find out how ‘computers’ are automating the ‘process of inventing’.

(12) Is a tomato a fruit or a vegetable?

The confusion about ‘fruit’ and ‘vegetable’ arises because of the differences in usage between scientists and cooks.  Let’s find out whether ‘tomato’is a fruit or a vegie?

(13)  The 5 Myths About Future Technology

Will all be driving flying cars? Will robots be our friends? Can climate change be stopped?  Can artificial intelligence (AI) and machines out rule the independent thinking and creativity of humans, and emerge as the planet’s dominant species?  Let’s explore.

Tutorials [2]

(1)  Tutorial: Motorised Ipod Tray

This article teaches how to motorise an iPod tray via servo motors [Tutorials].

(2)  Simulink Tutorial: Automatically Tuning a PID Controller

A PI controller can be modeled easily in software such as Simulink using a “flow chart” box involving Laplace operators [Video] [Tutorials].

Videos [4]

(1)  The LED Winked At Me !!  

Microcontroller – A Beginners Guide – Make the LED Blink and an Introduction to Bitwise Operations [Video].

(2)  Classical Methods For Tuning PID

The methods for tuning a PID loop are depicted here [Video].

(3)  Understanding PID in 4 Minutes

A proportional–integral–derivative controller (PID controller) is explained here [Video].

(4) Monkey: The Couch Guardian  

When your cats and dogs jump on your furniture and they shed their fur, and this fur ends up on your clothes. To stop them or to prevent this, learn how to make one of those old-fashioned cymbal-banging toy monkeys, modified with an inexpensive Arduino microcontroller and a proximity sensor.

 Softwares [2]

(1) The Nuts and Bolts of CRM

Find out why  IT-based tools and technologies are the heart CRM implementation.

(2) The 19 Deadly Sins Of Software Security That You Can Commit

Find out how and why poorly written softwares lead to vulnerable computer security.

If possible, pls vote and leave comments 🙂

The 5 Myths About Future Technology

November 16, 2012 Edit Leave a comment

 

2 Votes

Will all be driving flying cars? Will robots be our friends? Can climate change be stopped?  Can artificial intelligence (AI) and machines out rule the independent thinking and creativity of humans, and emerge as the planet’s dominant species?  Let’s explore.  

5 .  Soon We’ll All Be Driving Flying Cars
4 .  The Technological Singularity Approaches
3.  Moore’s Law Will Always Hold True
2.  Robots Will Be Our Friends
1.   We Can Stop Climate Change
Full Article :  Myths  
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The 17 Vices

November 15, 2012 Edit Leave a comment

 

2 Votes

This article enlists 17 vices with their dictionary meanings (in alphabetical order).   

  1.  Anger: Strong passion or emotion of displeasure or antagonism , excited by real or supposed injury or insult to one ‘ self or others , or by the intent to do such injury.
  2. Arrogance: Making undue claims in an overbearing manner; that species of pride which consists in exorbitant claims of rank, dignity, estimation, or power, or which exalts the worth or importance of the person to an undue degree; proud contempt of others; lordliness; haughtiness; self-assumption; presumption.
  3. Bragging: exhibiting self-importance, boastful talk.
  4. Cowardice: Lack of courage to face danger; extreme timidity; base fear of danger or hurt; lack of spirit.
  5. Disloyalty: Lack of loyalty; lack of fidelity; violation of allegiance.
  6. Doubt: Lack of Trust and confidence. To suspect; to fear; to be apprehensive.
  7. Envy: A feeling of discontent and resentment aroused by and in conjunction with desire for the possessions or qualities of another.
  8. Greed: An excessive desire to acquire or possess more than what one needs or deserves, especially with respect to material wealth.
  9. Injustice: The practice of being unjust or unfair.
  10. Impatience: The quality of being impatient; want of endurance of pain, suffering, opposition, or delay; eagerness for change, or for something expected; restlessness; chafing of spirit; fretfulness; passion
  11. Jealousy: The quality of being jealous; earnest concern or solicitude; painful apprehension of rivalship in cases nearly affecting one’s happiness; painful suspicion of the faithfulness of husband, wife, or lover.
  12. Recklessness: Wild carelessness and disregard for consequences. Insufficient consideration.
  13. Sloth: Aversion to work or exertion; laziness; indolence.
  14. Untrustworthiness: The trait of not deserving trust or confidence
  15. Vanity: Inflated pride in oneself or one’s appearance.
  16. Weakness: The quality or state of being weak; want of strength or firmness; lack of vigor; want of resolution or of moral strength; feebleness.
  17. Wrath: Forceful, often vindictive anger.

Courtesy : VirtueScience

How important is soldering?

November 15, 2012 Edit Leave a comment

 

2 Votes

Say it with me – ‘Yes, I really can solder that’! Yes, you really can solder that and anything else. This article includes basics of soldering. What’s soldering flux? Find out the rules for good soldering.

Among the foremost of reasons an electronic project frequently fails to work properly is due to “poor” soldering practices.

Let’s discuss the correct procedures for soldering electronic projects.

Dry joints when soldering

At first glance many solder joints appear to be quite “O.K.” but on closer examination many are in fact defective. The insidious problem with dry joints in soldering is that the circuit frequently performs alright for a period of time, even years before failure.

This problem even occurs with manufactured equipment. Ask any TV / Video repair technician who has torn a lot of hair out over an elusive fault ultimately traced back to a dry joint.

Good soldering practices for your electronic project

The cause of dry joints in soldering is mostly the improper application of heat. Both the component leg and the PCB need to be both heated simultaneously to the correct temperature to allow the solder to flow freely between BOTH surfaces. Obviously this requires practice and most newcomers inevitably get it wrong.

Improper heating while soldering and its consequences can be seen below.

Figure 1 - correct soldering procedures to avoid dry joints

Figure  – correct soldering procedures to avoid dry joints

Full Article : Electronics-Tutorials

Categories: Electronics Tags: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , ,

Teenage Romance: Like forces repel and unlike forces attract

November 15, 2012 Edit Leave a comment

 

2 Votes

This article explains electron theory and atoms. Find out why like forces repel and unlike forces attract each other.

Atoms and electrons

Everybody knows about atoms and electrons don’t they? Well we could skip this part but of course we won’t because you will likely learn something new.  

Electron theory states all matter is comprised of molecules, which in turn are comprised of atoms, which are again comprised of protons, neutrons and electrons. A molecule is the smallest part of matter which can exist by itself and contains one or more atoms.

If you turn on a light switch for example you will see the light bulb (globe) glow and emit light into the room. So what caused this to happen? How does energy travel through copper wires to light the bulb? How does energy travel through space? What makes a motor turn, a radio play?

To understand these processes requires an understanding of the basic principles. For the light to glow requires energy to find a path through the light switch, through the copper wire and this movement is called electron flow. It is also called current flow in electronics. This is the first important principle to understand.

The word matter includes almost everything. It includes copper, wood, water, air….virtually everything. If we were able to take a piece of matter such as a drop of water, divided it by two and kept dividing by two until it couldn’t be divided any further whileit was still water we would eventually have a molecule of water.

A molecule, the smallest particle which can exist, of water comprises two atoms of Hydrogen and one atom of Oxygen – H2O.

An atom is also divisible – into protons and electrons. Both are electrical particles and neither is divisible. Electrons are the smallest and lightest and are said to be negatively charged. Protons on the other hand are about 1800 times the mass of electrons and are positively charged. Each are thought to have lines of forces (electric fields) surrounding them. In theory, negative lines of force will not join other negative lines of force. In fact they tend to repel each other. Similarly positive lines of force act in the same way.

The fact that electrons repel electrons and protons repel protons, but electrons and protons attract one another follows the basic law of physics:

Like forces repel and unlike forces attract.

Full Article : Electronics-Tutorials

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Happy Birthday ‘Semiconductors’

November 15, 2012 Edit Leave a comment

 

2 Votes

It has been a century (100 years) since the discovery of Superconductors. Read this article to know milestones achieved up till today.

Superconductors

It has been a century since the discovery of Superconductors. The discovery was made by Heike Onnes on April 8th, 1911 at the Leiden Cryogenic Laboratory in Netherlands. The first experiment involved the immersing of a mercury capillary in liquid helium. In this experiment, Heike Onnes noticed the resistance of the mercury dropping to zero as soon as the temperature reaches 3 Kelvin’s or 3 degrees above absolute zero temperature. This was the first phenomenon which clearly showed superconductivity. But, the reason behind the phenomenon could not be explained then. The theory of quantum physics was not yet developed then. Later, researchers developed the basics of quantum physics and explained the reason behind Heike Onnes discovery.

There may still be people who are unaware of what superconductivity actually is. It is explained below.

We all know that in conductors, the resistance decreases as the temperature of the conductor decreases. But, in common conductors like Copper and Silver, the decrease in resistance will be limited to a certain extent even if the temperature is decreased. Even, if the temperature is brought to absolute zero, the copper conductor will show some resistance.  But, this characteristic is not seen in a superconductor. When the temperature is dropped down below its critical temperature, the resistance tends to jump to zero.

Thus Superconductivity can be defined as the sudden dropping of the electrical resistance to zero as soon as the temperature is lowered below its critical temperature. The phenomenon is characterized by an effect called the Meissner Effect. According to this theory, the principle of superconductivity cannot be understood through the principles of conductivity in classical physics. The theory also led to the discovery of better superconducting materials like “Balmy” which has a superconducting temperature of 138 Kelvin’s.

The principle of Superconductivity is so accurate that it has been proved that when a superconducting material placed in a closed loop, carrying an electric current will persist indefinitely even without an external power source.

Since then, researchers have discovered new families of materials that superconduct at higher and higher temperatures: the current record-holder works at a balmy 138 K.

What happened after 100 years?

Nothing much!!

The applications of such a great discovery still remain limited.

Some high end concepts like MAGLEV Trains, high speed, high efficiency super computers were all promised for future. But they have not been fully materialized.

In the MAGLEV train concept, the trains will levitate over magnetic fields and thus enable faster and highly efficient trains. The super computer technology will run at terra hertz speed without any heat loss.

The existing application of Superconductors includes strong magnets that power magnetic resonance imaging machines and also in advanced experimentation. Some of the most correct measurements in science are done through superconducting quantum interference devices [SQUIDs].

One recent application includes the use of electrical transmission lines using superconductors. These wires are made from high temperature superconducting materials like liquid nitrogen–based cryogenics. This transmission facility is being used by many for high end applications. A South Korean utility plans to install them on a large scale. There are also plans for constructing and designing a national superconducting super-grid instead of using the conventional high-voltage system.

Courtesy : CircuitsToday

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5 Design Ideas For Electronics

November 15, 2012 Edit Leave a comment

 

2 Votes

This article contains 5 design ideas, viz, :

  1. Find out how highpass filters modify equal-element design.
  2. Find out how position detectors provide motor-control logic.
  3. Let’s sneak peek into how bipolar transistor boosts switcher’s current by 12 times.
  4. Let’s explore how op-amp load is cancelled by negative resistor.
  5. Let’s learn the ropes of making repeatable JFET circuits via op-amps.

  52401di

Categories: Electronics Tags: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , ,

7 Design Ideas For Electronics

November 15, 2012 Edit Leave a comment

 

2 Votes

This article contains 7 design ideas, viz, :    

  1. Find out pros and cons of rotary switches and pushbuttons.
  2. Find out how simple FIFO is realised via FPGA.
  3. How can you get constant current for ISFETs/MEMFETs?
  4. Find out how temperature can be measured by USB link.
  5. Learn the ropes of single-sideband demodulator covering the HF band.
  6. Find out how voltage reference improves JFET.
  7. Learn the ropes of wideband filters that use image parameters.

    102600di

Categories: Electronics Tags: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , ,

I L U

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