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I just completed my college time but I never understand power electronics And now I prepare rvnl Jen exam and I don't understand also in coaching But after watching your video i feel satisfication and I m learn some awesome facts and easly understand some difficult topics
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All the subjects playlist of Engineering Funda is available in comment section. Share it with your friends to support us. Your positive comments motivates me and person like me get boosted by my students feedback. Thanks and welcome 🙏
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Your positive comments motivates me. Teachers like me just wants positive comment from student. Love from you guys means a lot to me. My goal is to create largest community of engineers in entire globe. Please help me by sharing this playlist with your friends.
after its full discharged it changes their polarity and starts charging with another polarity. this is described in operation of current commutated chopper
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capacitor changes thier polarity after discharging, but u had not discribed in video so vtg across of C and output vtg should be negative at one time. i am getting disturbance to understand it.
Hello, first of all thank you so much for this series of lectures, but i have many doubts with this particular analisys of relaxation oscillator in many points: -why didn't you assume the capacitor is initially discharged? -why V0 = 0 every time UJT is off? shouldn't V0 be given by voltage divisor of VBB across R1 and R2? -(most important) why C discharges only on R2 with time constant R2 * C? how can we prove this? -how can we know that UJT gets off when V is at valley point? thank you again.
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my college professor is a fool he don't know anything so I watch your videos and learn. Love your video sir lots of respect.
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In which college you study.
ONE OF THE EASIEST AND CLEAR EXPLANATION I HAVE EVER SEEN !! THANK YOU SO MUCHH!
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My college teacher don't know anything so i watch your videos. Thank you for helping us...
your welcome
Wow excellent superb lecture sir.. U helped me a lot I'm very thankful to you sir. Great job👌👍
Your welcome
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Thanks sir watching one day before my exam really thankful
Your positive comments motivates me.
Teachers like me just wants positive comment from student.
Love from you guys means a lot to me.
My goal is to create largest community of engineers in entire globe. Please help me by sharing this playlist with your friends.
Thank you sir all ur videos helped me alot ..... U made my learning so easy !!!
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Sir aap bahut acha se basics k saath padhate hai
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Best explanation sir thank you best for writing exams instead of reading the whole text and wasting time
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I just completed my college time but I never understand power electronics
And now I prepare rvnl Jen exam and I don't understand also in coaching
But after watching your video i feel satisfication and I m learn some awesome facts and easly understand some difficult topics
Your positive comments motivates me.
Teachers like me just wants positive comment from student.
Love from you guys means a lot to me.
My goal is to create largest community of engineers in entire globe. Please help me by sharing this playlist with your friends.
This video is much useful to revise the concept. Thank you so much bro
All the subjects playlist of Engineering Funda is available in comment section. Share it with your friends to support us.
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best channel for electrical engineering on youtube!
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very good explanation .its very helpful for understanding thr UJT
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Mr. U a star. Much respect. 👏
your welcome
I haven't understood it in whole semester and now I understood in 14 min, thank you
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Relaxation amplifier is also called relaxation oscillator??? Is it?
Best explaination Sir. 👍
Your positive comments motivates me.
Teachers like me just wants positive comment from student.
Love from you guys means a lot to me.
My goal is to create largest community of engineers in entire globe. Please help me by sharing this playlist with your friends.
your explanation is really nice and use full for us.thank you sir
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Ty sir for this superb video. 🙏
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Nice explanation and beautiful handwriting
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Sir, how the firing angle of the scr varied by using ujt relaxation oscillator
you are doing tremendous work
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Very nice its really helping out
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mind blowing explation way
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Always best
Your positive comments motivates me.
Teachers like me just wants positive comment from student.
Love from you guys means a lot to me.
My goal is to create largest community of engineers in entire globe. Please help me by sharing this playlist with your friends.
thank you so much sir, you save my exam :)
Most welcome!
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Your vedios will help me in exam
Surly it will help
Good one helped me a lot
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Sir I think their is a problem in time period T and time off
PLEASE show how they differ by...
Rest of video is 👌👌👌
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excellent
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in previous lecture you showed b2 at upper side and b1 at lower side. In this its opposite , can we take it either sides?
I also having same doubt
Both r correct as long as vbb is provided from d upper terminal
To uper kr lo na koya paresani h resistor hi to h bs rating ka khyal rkho practical me
Super
Thanks
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Excellent explanation
How do you claculate leakage current a UJT
Which transistor can use in ujt relaxation oscillator?
Sir everything is correct but R2 should be up and R1 should be down .......very good lecture
Best one
Your welcome
Tanq so much nice explained
+Sowjanya Kapa : your welcome
Ujt as a relaxation oscillator and simple ujt ckt me intrinsic stand off ratio alg alg ho jayga aise to??
Base terminal upper niche hone s??
thanks you sir,,
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Thank you sir
Sir pls do a video on relaxation time problems
What is the waveform across vb2
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Plz check the time period formula.. nice lectures👍👍
It's fine
Do u have done phototransistor
Nope
is this ujt triggering of scr
sir in exam if they asked like explain about ujt gate triggering circuit ?then we need to answer the same
reply me sir
Yes
But , sir given u r circuit in B1 instead B2 and B2 instead B1 ( According to text book)
It could be different ,it just a name . remember the logic only .
Sir is half wave rectifier also a relaxation oscillator?
Nope
In design parameters what about the resistance R1 ?
Super lectures sir....
If u would have mentioned what is relaxtion oscillator then it would have also been helpful
Omkar Chavan : I have explained that .... You see vedio properly
Oh Srry sir.. It was a nice video.
Sir, very good class . Can I get diac and scr
It is there in my power electronics Playlist
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How many parameters are given in the datasheet? Also do you have any videos on Programmable and Complementary UJT's?
Not yet
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sir can u tell me why we are taking only R2 in the time formula. ? why R1+R2 is not taking.?
i think it is actually supposed to be R not R2
Because only R2 is conducting not R1
after its full discharged it changes their polarity and starts charging with another polarity. this is described in operation of current commutated chopper
See in capacitor polarity of charging and discharging doesn't change. In inductor it happens.
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Will R2 vary
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Is it time base generator
Sir, in books ln is given in place of log. Are they same??
Ln and log are different and I have given correct data
Thanku
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what about Vbb when capacitor is discharging???
can you please share a study material for all session?
Why current not flow in upper part of ujt
🙏🙏🙏
Plz make video on PUT relaxation oscillato
It will there by today in my playlist
Why would the voltage of capacitor will not fall bellow the valley point voltage?😢
What is width of triggering pulse??
It depends on R and C values
@@EngineeringFunda Is there any formula for finding it??
Why it is charging for valley voltage why not from zero
Why the voltage of the capacitor goes to valley voltage and not 0?
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please explain synchronised UJT triggering
Sir please explain industrial firing circuit
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Can we changed resistance rb1 to Rb2
No
PE paper in 2 days ... ur my savior 😂
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how come output be 0? when there is Vbb applied
Because the pn juction i.e emitter base junction is in reverse bais till Vbb
Why you are not explain VB1 waveform?
What is the formula for R1?
in ckt parameters 3rd point why we took 10^4
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Sir why should we saw the thoot wave form in ujt
It seems like saw thoot due fast discharge of capacitor
capacitor changes thier polarity after discharging, but u had not discribed in video so vtg across of C and output vtg should be negative at one time. i am getting disturbance to understand it.
Capacitor don't change its polarity while it's discharging
Sir can u explain mosefet
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SCR GATE को TRIGGER हम UJT से क्यु करते है? जब की ये तो हम "Regulated DC " दे कर भी कर सकते है???
Sir, please can you explain Cosine firing scheme
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How to find eta value
eta is INTRENSIC STANDOFF RATIO .
eta= (Rb1/Rb1+Rb2) or (Rb1/Rbb). go through the equivalent circuit you will get this .
How do I calculate R1 ?...if you don't know you can just say it, rather than ignoring it so that I can move on
Hello, first of all thank you so much for this series of lectures, but i have many doubts with this particular analisys of relaxation oscillator in many points:
-why didn't you assume the capacitor is initially discharged?
-why V0 = 0 every time UJT is off? shouldn't V0 be given by voltage divisor of VBB across R1 and R2?
-(most important) why C discharges only on R2 with time constant R2 * C? how can we prove this?
-how can we know that UJT gets off when V is at valley point?
thank you again.
GATE को TRIGGER हम UJT से क्यु करते है? जब की ये तो हम "Regulated DC " दे कर भी कर सकते है???
By regulated DC you can give it once but for variable DC you need UJT
@@EngineeringFunda sir not under standing, it's mean,
R and R2 are misplaced and complete eqns are wrong.
sir plse check the time formula.
It is correct
It is incorrect in correct sir as in time formula instead of R2 R will take place
14:15
can u solve my doubt?
No equation for capacitance
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Thank u sir
SCR GATE को TRIGGER हम UJT से क्यु करते है? जब की ये तो हम "Regulated DC " दे कर भी कर सकते है???
GATE को TRIGGER हम UJT से क्यु करते है? जब की ये तो हम "Regulated DC " दे कर भी कर सकते है???
Thank u sir
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GATE को TRIGGER हम UJT से क्यु करते है? जब की ये तो हम "Regulated DC " दे कर भी कर सकते है???
GATE को TRIGGER हम UJT से क्यु करते है? जब की ये तो हम "Regulated DC " दे कर भी कर सकते है???