In this video series I discuss typical questions asked during electronic engineering job interviews. If you like the video then subscribe to my channel.
The first circuit is a LPF, since the signal was not given any values, its fair to assume that it is an AC square wave, not a pulsed squarewave. The output of a LPF with a AC squarewave input is a sin wave depending on the cutoff frequency of the filter, and the frequency of the first harmonic of the squarewave.
the shape of the output waveform from LPF totally depends on RC and time period of the input waveform, if RCT then the waveform is distorted that's why low pass filter can only be used as integrator when RC >>T. for those who don't understand the second waveform, it is the differentiator, since every practical signal is having some rise and fall time, therefore at edges where voltages going from either VDD to zero or zero to VDD, this gives you output=( delta_V/delta_t ), since rise and fall time is small causing spikes, while when input signal is stable at VDD and ZERO its differentiation is always zero.
bloodyrainbow Been wanting to be a Electrical engineer for NASA since 10, so I have a high passion for engineering as well. Sigh, my dad would rather have me be a carpenter than a civil engineer(He works construction ) -_- so despite years of passion I don't have much experience and that some days hurts me, never having heard of Trig, Calc 2 etc. I did find alot of help in physics and electronics here on TH-cam thought I love Walter Lewins Lecs on Phisics or watching a EEVblog vid.
The time constants (cutoff frequencies) do not stay the same for the second circuits. The second lowpass filter has 1/2 the time constant (twice the cutoff frequency) compared with the first lowpass filter.. The second highpass filter has twice the time constant (half the cutoff frequency) of the first highpass filter. Just draw the thevinin equivalant circuits.
+TheElectronicGuy-Probably he(Dipayan Das) didn't understand what actually you meant..and this the difference between a ARROGANT and a NORMAL INNOCENT man
Your question is absolutely legitimate. It is used to avoid electrical shock when insulated part is damaged. Avoids electrostatic and some other lightenings. Electrical grounding is important because it provides a reference voltage level (called zero potential or ground potential) against which all other voltages in a system are established and measured. An effective electrical ground connection also minimizes the susceptibility of equipment to interference, reduces the risk of equipment damage due to lightning, eliminates electrostatic buildup that can damage system components, and helps protect personnel who service and repair electrical, electronic, and computer systems. In effect, an electrical ground drains away any unwanted buildup of electrical charge. When a point is connected to a good ground, that point tends to stay at a constant voltage, regardless of what happens elsewhere in the circuit or system. The earth, which forms the ultimate ground, has the ability to absorb or dissipate an unlimited amount of electrical charge. From: whatis.techtarget.com/definition/ground
Er Danish Dandane basic electronics question r asked to evry1 nd after dat dey eil.ask u thr quesn related to.ur job field for ex. Goin for an microprocessor designer job dey wil nt ask u ques of instrumntation nd vice versa but basic of elctronics u shud kno
It will help you to derive the transfer function for the 2nd HPF circuit and compare it with the 1st one. For high frequencies the magnitude of the output voltage is 1/2 the input voltage. Equal impedances in series will produce the same voltage drop on each element. For high frequencies (the only frequencies that can pass through the 1st capacitor) the dominant impedance between the resistor and the 2nd capacitor will be the capacitor (the result of the equivalent impedance of 2 parallel impedances).
Hy I am btech 3 year ece student from pvt university I have a question for you "I am college topper i always participate curicular activities but I don't have any other experience so when d campus placement is come in my college then they select me or not if not then which type of extra courses I do?
see what type of companies come in college and do courses which they need, a software company will prefer some language knowledge and some project in that language, a data analyst profile will want something like excel or sql, all companies will want a good aptitude and personality.
I respect indians so much, but his accent is far more clear than the indian accent, which can't be more irritating! Stop discouraging people who want to make a change in their life.
Watching this makes me realize how rusty i am after a year of isolation
The first circuit is a LPF, since the signal was not given any values, its fair to assume that it is an AC square wave, not a pulsed squarewave. The output of a LPF with a AC squarewave input is a sin wave depending on the cutoff frequency of the filter, and the frequency of the first harmonic of the squarewave.
the shape of the output waveform from LPF totally depends on RC and time period of the input waveform, if RCT then the waveform is distorted
that's why low pass filter can only be used as integrator when RC >>T.
for those who don't understand the second waveform, it is the differentiator, since every practical signal is having some rise and fall time, therefore at edges where voltages going from either VDD to zero or zero to VDD, this gives you output=( delta_V/delta_t ), since rise and fall time is small causing spikes, while when input signal is stable at VDD and ZERO its differentiation is always zero.
What if RC=T, the spikes will be more curved at the top?
nothing beats hands on expirience
My niga!
bloodyrainbow Rare find, another Brony into electronics, who like Rainbow Dash lol
well engineering is my dream but I'm in welding for paying school. what about you?
bloodyrainbow Been wanting to be a Electrical engineer for NASA since 10, so I have a high passion for engineering as well.
Sigh, my dad would rather have me be a carpenter than a civil engineer(He works construction ) -_- so despite years of passion I don't have much experience and that some days hurts me, never having heard of Trig, Calc 2 etc.
I did find alot of help in physics and electronics here on TH-cam thought
I love Walter Lewins Lecs on Phisics or watching a EEVblog vid.
+dasdew2 If you don't fail you aren't challenging yourself. Keep trying to make stuff because it isn't expensive.
The time constants (cutoff frequencies) do not stay the same for the second circuits.
The second lowpass filter has 1/2 the time constant (twice the cutoff frequency) compared with the first lowpass filter.. The second highpass filter has twice the time constant (half the cutoff frequency) of the first highpass filter.
Just draw the thevinin equivalant circuits.
I guess it's kind of randomly asking but does anybody know a good website to stream new movies online ?
@Brycen Victor flixportal xD
@Paxton Orlando thank you, I signed up and it seems to work :) I really appreciate it!!
@Brycen Victor No problem :D
do continue the series with more videos!!
Low pass filter is PT1 system. High pass filter is the derivative of step response of pt1 system.
Great video! Thanks for sharing!
Thank you. Please make more videos
R=100k and C=1pF got the output for RC LPF
Vin=5V F=1Mhz
🙂
I found this very useful
R=100K and C=1pf VIn=5v for F=1Mhz
RC HPF
🙂
are you suppose to remember all these things after years of graduation ?
ThankYou Brother
We cant know because we dont know the tau, would be the correct answer.
Hi do you have any more common questions asked at electronics job interviews?
Yes I do, will post more videos soon. Probably within a week.
Dipayan Das many thanks
TheElectronicsGuy
Apologies for the delay. Just got back from hols. Hopefully soon.
TheElectronicsGuy
Check out part 2 which i just uploaded.
+TheElectronicGuy-Probably he(Dipayan Das) didn't understand what actually you meant..and this the difference between a ARROGANT and a NORMAL INNOCENT man
Hello,
even if my question is so stupid, can i get answered plz? How the ground and its absence affect the circuit?
Your question is absolutely legitimate. It is used to avoid electrical shock when insulated part is damaged. Avoids electrostatic and some other lightenings.
Electrical grounding is important because it provides a reference voltage level (called zero potential or ground potential) against which all other voltages in a system are established and measured. An effective electrical ground connection also minimizes the susceptibility of equipment to interference, reduces the risk of equipment damage due to lightning, eliminates electrostatic buildup that can damage system components, and helps protect personnel who service and repair electrical, electronic, and computer systems. In effect, an electrical ground drains away any unwanted buildup of electrical charge. When a point is connected to a good ground, that point tends to stay at a constant voltage, regardless of what happens elsewhere in the circuit or system. The earth, which forms the ultimate ground, has the ability to absorb or dissipate an unlimited amount of electrical charge.
From:
whatis.techtarget.com/definition/ground
Er Danish Dandane basic electronics question r asked to evry1 nd after dat dey eil.ask u thr quesn related to.ur job field for ex. Goin for an microprocessor designer job dey wil nt ask u ques of instrumntation nd vice versa but basic of elctronics u shud kno
Can u explain why the spikes are halved in second ques?
Because it is a voltage divider. Vo = R/(R+R) * Vi
It will help you to derive the transfer function for the 2nd HPF circuit and compare it with the 1st one. For high frequencies the magnitude of the output voltage is 1/2 the input voltage. Equal impedances in series will produce the same voltage drop on each element. For high frequencies (the only frequencies that can pass through the 1st capacitor) the dominant impedance between the resistor and the 2nd capacitor will be the capacitor (the result of the equivalent impedance of 2 parallel impedances).
thanks
What happened if ur not assuming resistors are equal
www.udemy.com/rc-circuits-for-interview-part-1
Hy I am btech 3 year ece student from pvt university I have a question for you "I am college topper i always participate curicular activities but I don't have any other experience so when d campus placement is come in my college then they select me or not if not then which type of extra courses I do?
see what type of companies come in college and do courses which they need, a software company will prefer some language knowledge and some project in that language, a data analyst profile will want something like excel or sql, all companies will want a good aptitude and personality.
www.udemy.com/rc-circuits-for-interview-part-1/
Reason behind getting such spikes is whati wanted to know
differentiation of rising and falling edge...physically when t=0+ the cap is short circuited...and when in steady state the cap is open circuit...
why there is negative delta for differentiator circuits
because the falling edge is is also differentiated...
There was no explanation of why the outputs are what they are. I didn't find this helpful at all.
These EE interviews are so difficult. Analog makes noooo sense
It makes total sense if you paid for attention in your analog circuits classes and in E & M.
@@MarkMcDaniel yes
Tu eng acha bolta h
You are doing a good job but please cut the accent that you are trying to imitate, its so irritating and i think our Indian accent is well enough !!!
I respect indians so much, but his accent is far more clear than the indian accent, which can't be more irritating! Stop discouraging people who want to make a change in their life.
plz guys help me for my Q.?