UJT as relaxation oscillator (Basics, Circuit, Working, Waveform & Parameters) Explained

[@EngineeringFunda]

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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.

[@vidhathrisharma2278]

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...

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your welcome

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Thanks sir watching one day before my exam really thankful

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[@rajakrraj123]

Sir aap bahut acha se basics k saath padhate hai

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[@krishnasankar4277]

Best explanation sir thank you best for writing exams instead of reading the whole text and wasting time

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I haven't understood it in whole semester and now I understood in 14 min, thank you

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[@himglows1020]

Relaxation amplifier is also called relaxation oscillator??? Is it?

[@kanchigupta30]

best channel for electrical engineering on youtube!

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[@TVETHigh]

Mr. U a star. Much respect. 👏

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your welcome

[@Railway_wala_je]

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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[@nisamuddeenpalliyali1141]

Sir, how the firing angle of the scr varied by using ujt relaxation oscillator

[@Magnetic_Sapphire_69]

This video is much useful to revise the concept. Thank you so much bro

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[@rajtiwari2207]

very good explanation .its very helpful for understanding thr UJT

[@thearchetype9829]

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[@durgeshzope5142]

Best explaination Sir. 👍

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[@febintom5433]

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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Very nice its really helping out

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Nice explanation and beautiful handwriting

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mind blowing explation way

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Your vedios will help me in exam

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Surly it will help

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Good one helped me a lot

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[@sanskritibhardwaj5922]

in previous lecture you showed b2 at upper side and b1 at lower side. In this its opposite , can we take it either sides?

[@RajiSuresh-Spiritual-Talks]

I also having same doubt

[@sunshine-by2kl]

Both r correct as long as vbb is provided from d upper terminal

[@mohd.husain2224]

To uper kr lo na koya paresani h resistor hi to h bs rating ka khyal rkho practical me

[@akhilskumar5124]

Which transistor can use in ujt relaxation oscillator?

[@Kitti8892]

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??

[@harshchaudhary743]

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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[@ee-061dhanunjaya9]

sir in exam if they asked like explain about ujt gate triggering circuit ?then we need to answer the same

[@ee-061dhanunjaya9]

reply me sir

[@EngineeringFunda]

Yes

[@millylinc3772]

Excellent explanation How do you claculate leakage current a UJT

[@RUPESHSINGH-xl9fx]

What is the waveform across vb2

[@thearchetype9829]

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[@sowjanyakapa]

Tanq so much nice explained

[@EngineeringFunda]

+Sowjanya Kapa : your welcome

[@ARHAMHASU]

Sir, in books ln is given in place of log. Are they same??

[@EngineeringFunda]

Ln and log are different and I have given correct data

[@muhammedafsel3078]

excellent

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[@nathurmnangare229]

after its full discharged it changes their polarity and starts charging with another polarity. this is described in operation of current commutated chopper

[@EngineeringFunda]

See in capacitor polarity of charging and discharging doesn't change. In inductor it happens.

[@thearchetype9829]

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[@geetikathakur9362]

is this ujt triggering of scr

[@markdavid5254]

Sir is half wave rectifier also a relaxation oscillator?

[@EngineeringFunda]

Nope

[@rajeswariv2]

Super

[@EngineeringFunda]

Thanks

[@thearchetype9829]

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[@saikumargannavarapu1898]

what about Vbb when capacitor is discharging???

[@INSTRUMENTATIONISGREAT]

Sir everything is correct but R2 should be up and R1 should be down .......very good lecture

[@adityakumardas8759]

thanks you sir,,

[@thearchetype9829]

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[@kabhilash813]

in ckt parameters 3rd point why we took 10^4

[@thearchetype9829]

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[@harigovindsingh1425]

sir can u tell me why we are taking only R2 in the time formula. ? why R1+R2 is not taking.?

[@archiboldpatsanza884]

i think it is actually supposed to be R not R2

[@Crazyforelectronics]

Because only R2 is conducting not R1

[@sampathkumar1687]

Do u have done phototransistor

[@EngineeringFunda]

Nope

[@namratashirsat5877]

How many parameters are given in the datasheet? Also do you have any videos on Programmable and Complementary UJT's?

[@EngineeringFunda]

Not yet

[@thearchetype9829]

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[@aditikumari3677]

Why would the voltage of capacitor will not fall bellow the valley point voltage?😢

[@yograjthakur2394]

Plz check the time period formula.. nice lectures👍👍

[@EngineeringFunda]

It's fine

[@h_soumajit98]

Thank you sir

[@ujjwalyadav8780]

Why it is charging for valley voltage why not from zero

[@kushkotak4832]

What is width of triggering pulse??

[@EngineeringFunda]

It depends on R and C values

[@kushkotak4832]

@@EngineeringFunda Is there any formula for finding it??

[@theunusualgyan9940]

If u would have mentioned what is relaxtion oscillator then it would have also been helpful

[@EngineeringFunda]

Omkar Chavan : I have explained that .... You see vedio properly

[@theunusualgyan9940]

Oh Srry sir.. It was a nice video.

[@Nagaraj-tg5sp]

Sir pls do a video on relaxation time problems

[@jaimeye9995]

Why the voltage of the capacitor goes to valley voltage and not 0?

[@thearchetype9829]

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[@sindhupv8229]

Sir, very good class . Can I get diac and scr

[@EngineeringFunda]

It is there in my power electronics Playlist

[@thearchetype9829]

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[@MoHiTKuMar-id6ue]

Best one

[@EngineeringFunda]

Your welcome

[@bankeshroy4569]

please explain synchronised UJT triggering

[@pawankumaratal6375]

Can we changed resistance rb1 to Rb2

[@EngineeringFunda]

No

[@gvr197]

Why current not flow in upper part of ujt

[@rajchaudhary4016]

Is it time base generator

[@geeteshkashyap9447]

Thanku

[@EngineeringFunda]

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[@vengat3556]

how come output be 0? when there is Vbb applied

[@chaitanyakishore2150]

Because the pn juction i.e emitter base junction is in reverse bais till Vbb

[@reetv6513]

But , sir given u r circuit in B1 instead B2 and B2 instead B1 ( According to text book)

[@chaitanyakishore2150]

It could be different ,it just a name . remember the logic only .

[@abhilashrai1013]

Will R2 vary

[@thearchetype9829]

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[@satyanadar730]

What is the formula for R1?

[@skphysics8269]

Sir why should we saw the thoot wave form in ujt

[@EngineeringFunda]

It seems like saw thoot due fast discharge of capacitor

[@geeteshkashyap9447]

🙏🙏🙏

[@sreekanthpk2266]

In design parameters what about the resistance R1 ? Super lectures sir....

[@mahendraprajapati9712]

can you please share a study material for all session?

[@incogvirus5851]

Why you are not explain VB1 waveform?

[@yeralareddy5991]

Plz make video on PUT relaxation oscillato

[@EngineeringFunda]

It will there by today in my playlist

[@NishantKumar-sj6rk]

Sir please explain industrial firing circuit

[@thearchetype9829]

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[@kanchigupta30]

Sir, please can you explain Cosine firing scheme

[@thearchetype9829]

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[@pranay4216]

SCR GATE को TRIGGER हम UJT से क्यु करते है? जब की ये तो हम "Regulated DC " दे कर भी कर सकते है???

[@bluesteel1]

PE paper in 2 days ... ur my savior 😂

[@EngineeringFunda]

Your positive comments motivates me, my goal is to create largest community of engineers in entire globe, so please help me for that by sharing this lecture series(playlist) with your friends in social media (watsapp, telegram etc). Thanks and welcome 🙏

[@nathurmnangare229]

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.

[@EngineeringFunda]

Capacitor don't change its polarity while it's discharging

[@dhanushdb6241]

Sir can u explain mosefet

[@thearchetype9829]

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[@pranaykumar6875]

How to find eta value

[@chaitanyakishore2150]

eta is INTRENSIC STANDOFF RATIO . eta= (Rb1/Rb1+Rb2) or (Rb1/Rbb). go through the equivalent circuit you will get this .

[@fidirita4468]

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

[@giack6235]

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.

[@pranay4216]

GATE को TRIGGER हम UJT से क्यु करते है? जब की ये तो हम "Regulated DC " दे कर भी कर सकते है???

[@EngineeringFunda]

By regulated DC you can give it once but for variable DC you need UJT

[@pranay4216]

@@EngineeringFunda sir not under standing, it's mean,

[@dhirendrajha8952]

sir plse check the time formula.

[@EngineeringFunda]

It is correct

[@ArshadIqbal_IEC_]

It is incorrect in correct sir as in time formula instead of R2 R will take place

[@allraunderchanal1780]

14:15

[@misetro12345]

R and R2 are misplaced and complete eqns are wrong.

[@nathurmnangare229]

can u solve my doubt?

[@bharathr2871]

No equation for capacitance

[@thearchetype9829]

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[@mahalakshmi3376]

Thank u sir

[@pranay4216]

SCR GATE को TRIGGER हम UJT से क्यु करते है? जब की ये तो हम "Regulated DC " दे कर भी कर सकते है???

[@pranay4216]

GATE को TRIGGER हम UJT से क्यु करते है? जब की ये तो हम "Regulated DC " दे कर भी कर सकते है???

[@nitishsou7439]

Thank u sir

[@EngineeringFunda]

Your positive comments motivates me, Thanks and welcome 🙏

[@thearchetype9829]

Helloo there MAKE YOUR OWN SPIRAL LED LAMP FOR DIWALI DECORATION!! kzbin.info/www/bejne/o5vCkIiIa9hjsJo

[@pranay4216]

GATE को TRIGGER हम UJT से क्यु करते है? जब की ये तो हम "Regulated DC " दे कर भी कर सकते है???

[@pranay4216]

GATE को TRIGGER हम UJT से क्यु करते है? जब की ये तो हम "Regulated DC " दे कर भी कर सकते है???