reachrkata
@reachrkata-FOcqhH Member
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The Story of Nikola Tesla
Its perhaps true. There is a passing reference to this rivalry in the movie "The Prestige" if anyone has seen it. - Karthik
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which Port identifies battery charger?
There is usually a battery management IC which does this. It senses the presence/absence of power and starts charging accordingly.
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Whaat will happen if ...
What you have to realise here is that KVL should not be applied along with Superposition. These are two separate tools of analysis never to be...
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Series and parallel circuits
There are 2 ways to understand this - 1) Consider the voltage equation of a cap V = 1/C * (integral) i.dt. if there are 2...
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Whaat will happen if ...
Exactly. But what you need to understand is that, the superposition theorem is just a mathematical method of simplifying analysis of circuits with multiple sources. It...
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Why source generated signal frequencies are converted into carrier frequencies...?
Re: Why source generated signal frequencies are converted into carrier frequencies... Perhaps this thread help !! #-Link-Snipped-#
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Building Load Shedding
Hello LEon, You are correct in starting out with a list like you mentioned. Further to that, I have a few suggestions - 1) Try to...
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Whaat will happen if ...
A current of 1A will flow through the resistor. The voltage drop across the 2 Ohm resistor balances the 2V voltage source and therefore no current...
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phase difference
Assuming sinusoidal signals, it is neither 0 nor 45, but in fact at 30 degrees !!! -Karthik
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Meaning of 'Class' in MicroSD Cards
Nah nothing like that. I have been checking all the posts in the forum and replying to some also. Perhaps I don't reply often, but thats...
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Meaning of 'Class' in MicroSD Cards
Hey K, Its almost like how you said, but its just that the speed will be a minimum of XMBps. <a href="https://en.wikipedia.org/wiki/Secure_Digital#Speeds" target="_blank" rel="...
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Measuring an electric field
skipperWell, if you adjust the volume for a number of different broadcast signals, using a battery-powered radio, so that in each case they output the same...
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Poor 2G/3G quality inside a moving elevator
Thats because, usually, lifts/elevators are closed metal boxes, which are very good shields for RF signals. However, there are solutions available to overcome this problem too...
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dual power supply in Differsntial amplifier..
I dont see any particular difference except that in a single supply scenario, both the inputs need to be biased with 1/2 the supply voltage, what...
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What is the Relationship Between Frequency and Power?
qaisarpk1its fine mohit ..... as u said that the lower frequncy travel more distance then why we modulate low freq signal on higher frequencies .... kindly...
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Why are UPS so heavy?
Another important item that makes the UPS heavy is a step down transformer. There are transformer-less UPSs also available. However all the simple ones usually have....
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Power Loss
No. Since the current will flow from the 5V supply into the 3V supply, it will always gain power. It is like charging a battery. -...
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Circuit capacitance
One way is to give a step input to the circuit and calculate the output based on the rise time at the output. Perhaps you can...
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how to reduce certain value of a DC voltage bot not the other values?
Adding an inductor should slow down the voltage rise. -Karthik
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why voltage across current source can't be measured?
Yes for analysis, it can be assumed ideal. For current sources, the ideal scenario is that its internal shunt resistance is infinite. Thats all. The source...
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why voltage across current source can't be measured?
shreyasm89.. Remember there is no difference in the values of currents at the i/p and o/p of a current source. this implies that there is no...
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why voltage across current source can't be measured?
Before I tell you what I want to tell, let me first confirm that, yes, we can measure the current through a voltage source. Just connect...
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how television sets on same channel after restart?
Usually such settings (like the las channel visited, last volume level) is stored in EEPROM before switch-off. On switching on, it does so as per the...
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I need help with memory desiging.
Since you have 2 memory devices of 512K each, they require 19 address lines. Use the 20th address line as a select (or enable) for the...
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negative potential
If you recall your engineering, Potential at a point is defined as the work done to move a charge from infinity to the point. Since infinity...
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FM Transmission
@Ashish - You understood me wrong. 2 stations can be transmitting at the same signal level. But if one of the stations is in Bangalore and...
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FM Transmission
Its just because of the distance between the two sources. Just like there are norms governing bandwidth, deviation, etc, there are also those governing maximum transmission...
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Fully charged capacitor short circuited?
No it will rise, but not instantaneously. It will rise exponentially. -Karthik
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Fully charged capacitor short circuited?
In fact the capacitors never charges again. All the electrons in the -ve terminal flow instantaneously to neutralise the positively charged terminal. The Energy is lost...
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Op Amp Question
Use superposition theorem to get the output of the non inverting amplifier for the 2 inputs separately. Add the results and you have the answer. -...
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what are the capacitances of MOSFET?
The most important is the Gate - source capacitance. This decides how fast the MOSFET can switch. -Karthik 😁
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What are implications for change over from 50 hz to 60 hz system?
If you are using devices that usually work on DC - Like your laptop, TV, stereo system would not be affected that much i think, since...
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input from keypad and microcontroller
No sweat Ash !! i too learnt it only in my company !!! -Karthik 😁
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input from keypad and microcontroller
Perhaps this clarifies everything - -Karthik 😁
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input from keypad and microcontroller
Sure can. You can do it with a single ADC port. Connect the ADC port to the supply via a 47k pull-up (say). Next, connect different...
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charging of batteries
Nope, Batteries in series retain the Ah rating, and batteries in parallel retain the voltage rating. - Karthik 😁
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op amp
Usually there is no need to change anything if you are using an 8 Ohm speaker because for the same power output the current required will...
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i need a 7 segment display up down counter
My 2 paise - Take the standard available up/down converter ICs. Then use a binary to 7 seg decoder for interfacing with the segment LED. -Karthik...
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charging of batteries
It is dangerous to connect the power supply directly to your battery. The current may be so high that the battery may overheat and get destroyed....
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zener diode
The principle is called zener breakdown. Due to the way the diode is doped, when a reverse voltage is applied, the depletion region widens and creates...
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common emitter bjt
The secret lies in the very small thickness and very light doping of the base. With the base voltage, there are so many electrons in the...
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How to convert change in capacitance into a digital signal
I think so yes !😕 -Karthik
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How to convert change in capacitance into a digital signal
adi21288@karthik dude i dint understand your concept, i mean u r feeding a dc voltage to a low pass filter (high voltage frm the mu p...
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How to convert change in capacitance into a digital signal
I got this nice idea from a colleague of mine, so quoting him here. Use the capacitor as part of an RC Low pass filter circuit....
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stupid basic dilemma
I think then it would act like a Tank circuit which can be used as an oscillator. -Karthik
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rotation of fans
Its perhaps just the direction of inclination of the blades. - Karthik
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stupid basic dilemma
Aha !! Nothing is lost my friend !!! Initial energy = 0.5*C1*V1^2 + 0.5*C2*V2^2 = 0.5*1*1^2 + 0 = 1 J0.5*1*1^2 = 0.5 and not 1...
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a fundamental question on basic electricity flow
Hmm. I think you would not see any appreciable difference. The speed of electron flow is so fast compared to the speed of water flow that...
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Answer this question
Zero (assuming ideal caps)!!! Anything you do with only capacitors on DC sources makes no difference. -Karthik 😁
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mobile phone charger
Agree to that. Perhaps a part of the loss is due to loading itself. Sometimes, certain switching supplies tend to go into instability when not loaded...
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Measuring RF signals on oscilloscope
Hmm. Since the scope is a 50MHz one, and your carrier is only 10MHz, i think you can measure it. Just probe the RF input at...
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RESISTOR VALUES which is connected to an AC power
No need of a resistor. If your bulb is rated for 230V AC, then just ut the bulb to the supply and you will get the...
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Transistor circuit maximum voltage swing
Great !! Then the maximum voltage swing is 9.9 - 3.3 = 6.6V. This behaviour can also be simulated in Multisim. To your circuit, just give...
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Transistor circuit maximum voltage swing
Ok here goes. I presume that you are requesting the output voltage swing calculation for the normal CE amplifier ckt with Rb = base resistor, Rc...
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Engineering Project Help - LDR security buzzer circuit
Perhaps this thread will help you with a simple password entry keyboard - #-Link-Snipped-# - Karthik 😁
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Need help to fix type of sensors in collision free car
Infrared sensors are commonly used for this. -Karthik
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Electronic switch
Repeated on-off is just one of the scenarios. Another typical application would be to switch off/on something based on a special condition (like temperature) which a...
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Electronic switch
Simplest and straightforward answer - An electronic switch eliminates Human intervention i.e you can write a program to turn on and off an electronic switch, but...
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A battery question
300mA should be OK. In fact I feel it is an overkill, but nevertheless its fine. In any case there is no danger of any damage....
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Digital step-KM counter
Hmm !!! It is a bit tedious to explain this circuit, because there is a reason for each and every value of R & C used....
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A battery question
Doesn't matter !! There is no relationship between the mAh rating of the battery vs the current rating of the adapter. The mAh rating of a...
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Answer the Electronics problem
Of course, based on the temperature the Ohmic value would vary. But the device remains Ohmic nevertheless !😉 -Karthik
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Urgent help please--need to make sense of a circuit
This is how I understood the circuit - 1) R1-C1-D1-D2 form a clipping circuit such that, before diode D3, we get a clipped sine wave of...
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Answer the Electronics problem
Hey Big Ohm, All electrical devices are Ohmic in a way. The heating element in the heater is Ohmic and so is a lamp. -Karthik
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seven segment LED
Simple - Given that Power supply is 5V, and LED Vf is 1.4V. The rest of the voltage has to drop in a resistor. Secondly current...
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Answer the Electronics problem
1) I totally disagree with them. When you connect two loads in series, the current through them is always the same. WHATEVER YOU DO !!!😒 2)...
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How to generate the sound of a certain frequency?
I think this link gives a circuit to you without the need of Schmitt triggers - <a href="https://ece.uprm.edu/%7Epol/pdf/icee04CruzPol.pdf" target="_blank" rel="nofollow noopener...
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Answer the Electronics problem
1) 1:1 2) 2000W 3) 50W 4) (1/4*Pi*Epsilon)(p^2*a^2/d^2) - None of the choices. - Karthik
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seven segment LED
Though i am not completely sure about it, i think the half digit means that in the Most Significant digit position, all the segments will not...
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seven segment LED
Before we go to the actual solution, lets see if people can get the answers first - a) Max power used = 1.15W b) LED resistor...
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automated water tank
Hi Noj, I fell i am not exactly able to understand what you have implemented in order to comment on it. Like Big K said, better...
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automated water tank
The problem is the NAND gate. Assume S1 is upper sensor output and S2 is lower sensor output, and assume that when water level reaches below...
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can i know working of this circuit?
Hmm !!! Perhaps you should just check the theory behind the circuit in your text books and try out the calculations. Then you may get an...
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problem in IR sensor circuit
Which is the IR receiver you are using? Can you give the part number? From what i understand from the circuit, you want to stop the...
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can i know working of this circuit?
The reason why the astable will not get simulated in any circuit simulator (incl PSPICE) is because the astable works on the principle that there is...
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can i know working of this circuit?
Ok, here is what i understood - 1) Circuit with IC1 is an Astable Multivibrator to generate the clock for IC2. The clock frequency is decided...
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What is the use of optocoupler in this circuit?
Exactly ! Plus also connect pin 4 to GND. -Karthik
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What is the use of optocoupler in this circuit?
Yes you will see an output at pin 1 of the Opto. But this will not be useful because the R1 = 100kOhm and this high...
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Problems understanding a circuit
The main idea of using Schematic page 5 is given on Page 4 of the same document. It is a 120 kHz carrier detector. It gives...
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What is the use of optocoupler in this circuit?
That is because the behavior of the component is such. Whenever a current flows through the LED in the Opto, we expect the switch (phototransistor) to...
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The voltage waveform of a capacitor?
It would still be an exponential charge or discharge depending on whether the final voltage at the 2nd circuit is respectively higher or lower than the...
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What is the use of optocoupler in this circuit?
I can think of only 1 reason - GROUND ISOLATION. -Karthik
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can u tell me whether this circuit is having some error or not
1) Yes the circuit is correct. No mistakes. No need of the Opto to check the output. Just check the voltage at IC1C pin 9. It...
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