How to design Transformerless Power Supply circuit Explained with Calculation

[@jhana.2023]

You are very organized. Makes the explanation of the circuit very clear, very visible. One of the best Electronics channels I've ever seen on KZbin. And the best ????? Without those horrible songs that take the focus away from the explanation. Very good ! Congratulations !!! 👏👏👏 (from Brazil)

[@TechStudyCell]

Thank you for the feedback... we will correct it

[@democracyforall]

@@TechStudyCell you should have explained the rest of the circuit as well how you got the 450 micro farad and the first resistor and the other...

[@alfredcalleja450]

Thank you for being so clear in your instructions: I really appreciate the time and effort you put into this tutorial. Thanks from Australia.

[@TechStudyCell]

Welcome... But don't use this circuit for variable DC load.

[@hadypranoto2329]

@@TechStudyCell what mean.. what kind dc variable load?

[@slimeedude]

bro my 100 ohm resistor died 💀

[@emiliorodriguez6438]

@@slimeedude LMAO

[@souravbhattacharyya3392]

​@@slimeedudethis is a fuse resistor meant to blow off in case of overload and hence project the main unit

[@dushanshachithra5894]

Your teaching style is beautiful. Thank you.🙏❤

[@NabilRayhan-r9y]

Thank you brother for making it this much easier.

[@anikettripathi7991]

Consumers friendly technological designing are always different from business friendly. So many extra components and complicated designing are good for business.

[@mdalibmaris5175]

In your calculation, your AC capacitor value to be used is 1uf....but practically you are using the capacitor marked 155 J the value 1.5uf. I think you should be using 105 (1uf) to be exact instead of 155 (1.5uf). I wonder if there are changes in the output voltage at point A if the capacitance of the AC capacitor are changed. Please clarify.

[@rahulwaghmare6370]

His schematic n pcb is diffrent

[@NgocDangDinh]

Thank you very much for your video, can I have a question on avoiding of shocking on touching the output: 1. Can we you a phase cut at 5 VAC wave from using Zero cross protection stuff like MOC3021 and a small micro controller, triag to handle the trigger for wave form cut so that the overall voltage will never bee too high? 2. Of course with this, the synchronous wave form will be cut and have some time no power, can we use capacitor/ inductor to supplement the loss of power during the cut of AC wave form?

[@TechStudyCell]

This power supply is only for small constant DC load. I will suggest you to use SMPS power supply.

[@divikumar5475]

Explained pretty smooth and crystal clear. My question is, what will be the voltage after the 470micro f capacitor (C2)?

[@javiercavo1]

I think it depends of the frecuency, because the voltage in that point depend of the percentage of charge in C1...

[@malcolmhodgson7540]

5.1v as clamped by the Zener

[@shekavadh1568]

you have forgotten to add a series resistance with zener diode (current limiting resistance )

[@amitsolanki2321]

I need 2amp current which resistane (ohm) i use?

[@chandhrenb335]

@@amitsolanki2321 I guess increase in capacitors in parallel will increase the current

[@vishwanathballurgi4443]

This is the only video as to how to choose correct particular based on physics calculation.

[@badrinath6059]

Bro excellent project. I have been requesting you to provide complete project kits (sale) those who wants build the same..

[@trevor18ut]

Hi, A good effort of details in your video. It does not show the AC voltage before the bridge and DC voltage after the bridge prior to filter.

[@aliyychannel4764]

How much maximum current allowed for averall the power supply circuit when we connect to any larger load?instead only LED...how to estimate it?

[@sunilsheth826]

Thank you for a very good explanation

[@celtichongy]

Explained nice and clearly. Good job.

[@TechStudyCell]

Thanks for the feedback...

[@neon-pl3du]

explain really well, is it possible to power this circuit without a load ? In the video you use a motor as a load.

[@ljubomirculibrk4097]

For those that as of Amp rating, this is in the area of 10 to 50mA, depending of the input cap A 470nF X2 cap gives some 10mA This is not isolated power suplly, it has potential to ground or null in the range of 220V, it can shock or kill if you make a contact whit it

[@murugan.cmurugan.c3709]

Great job I require that C2 ( capacitor value ) Please calculate method & including all formula.. I am waiting

[@electronic7979]

Useful video 👍 very good

[@TechStudyCell]

Thanks...

[@RicoPrasetyo-vq5cw]

can you explain, how you get the value of r1 ,r2, and r3

[@AllAroundUs999]

Hi, can you please tell me what the R3 does, couldn't you connect it directly to the full bridge rectifier and ignore adding it? If you or someone else can shed some light on my question I would be forever grateful.

[@anshtiwari3994]

how can i get 1 amp output current cz i wanna glow 40 rgb leds connected in a parallel

[@ViniciusCZanini]

Thank you for this video. Is R3 really important? Why?

[@landroveraddict2457]

Hi thank you for your video and the time you took in making it. Is it possible to use this type of circuit to drop ac to a lower ac voltage. I have two 220v 30w LED flood lights. I want to reduce the voltage to about 200v for maximum led life. The LED are very bright and I think are being over driven. The units are sealed so I can not get inside them to lower the DC voltage. Is my only option to install a mains dimmer switch? Help, advise please.

[@vijaymathkari4208]

Want to try making it

[@avadhootmandhare4383]

Kindly suggest component values to get 48v dc output from 230v ac by using above method.

[@MdshahalammijiShahalam]

can we measure the output voltage of transformarless powersupply wihout connected to the load?

[@steveron6308]

Sir from where you got the printed pcb , I need some pcb

[@biplabhazra2286]

If I want 5V, 2 A current DC output without any transformer (with 2 DC capacitor and Inductor) what will be the circuit diagram?

[@jumbo999614]

Do you have circuit in PDF or JPEG format? I want to make pcb at home instead of ordering on online store. In my country, it's expensive.

[@andreastriwinarto4422]

How if i need 24 volt dc?.. could you give the values of all the component?

[@headway19]

What is the value of DC capacitor you have used

[@parapos]

great instructions, but your formula C= 1/ 2x3.14 x50 x3192.6 = 9.975 (not 0.97). still about 1uF but not accurate or i am still missing something???

[@sultanmulyono4781]

How many ampere at 5v sir thank's.

[@omaral-gallab4886]

Please, how much value for bleeder resistance

[@LearnBe4]

Can we use this for esp32?

[@1008108108]

Where to purchase biard

[@manjunathcv9146]

What is shipping cost of pcb shipping to india?

[@Babbu6969]

For 150volt dc pls let me know the value of component

[@1008108108]

Web site is not clear to order

[@kennyhokeanseng]

What about using same circuit, but I need 36v 5A. Please help up, thanks 🙏🏻

[@TechStudyCell]

For high current please use SMPS power supply

[@robinhood2455]

This is not the right way....You did not consider the 100 ohm resistor

[@abhishekdey9392]

Hello..can you pls tell me if I want 12v at point A, with 300 mAmp, what should be the capacitance , I calculated however I m not sure...it is coming like 0.00000292712626451....can you help here

[@mahmoudabulwafa3508]

that means 2.9 microfarad (uf)

[@jayarajjayarajua4339]

Well explained but text appearing on the video blocks the ckt and components.let the text scroll at the bottom of the video please. B lore.

[@manassehabraham5589]

I'm not getting the correct voltage for my 12v .... It's only giving .2v

[@hadypranoto2329]

How much current in this circuit?

[@informing_]

Max amps??

[@ilhemedu31]

dangerous . solution was practical when transformers were expensive and big. Now phone chargers are available everywhere.

[@vernonbosshard9317]

I don't get why you use P-P instead of RMS.

[@quickfixengineeringltd8035]

What's the output current

[@gencbirmuhendis185]

Did you find your answer?

[@davey2k12]

Didn't explain where you get such big capacitor and how much

[@chennairobotist]

These capacitor output is not safe, if the input voltage raises to a high voltage, the capacitor might blast. This happened to me twice.

[@freedomisfood6966]

thanks.but i test many times but never cant do this.i use 1 m ohms and 750 nf.i dont want a specefic voltage ,i just want to test but never succeed.i make circuit on bridboard bread board. 😭😭😭😭

[@biswajitrai3574]

How make 5v 3amp

[@hasanali-ht2kq]

How many ampers?

[@AbhishekKumar-fm8vg]

Diagram ya PCB layout chahiye

[@nageshpodili6421]

Plzz give me pcb layout

[@rajaraju3754]

Bleder resistorvalue

[@anikettripathi7991]

All led drivers can have transformerless power supply, but why we don't.

[@ahmadsalem8935]

How much amp?

[@tanimsk]

155J is of 1.5uF, then why did you say 1uF?

[@Zeddify]

transformerless, but dangerous. So use caution

[@mentar1908]

how to increase Amp ? 1A or 2A

[@gencbirmuhendis185]

Did you find your answer?

[@mentar1908]

@@gencbirmuhendis185 no, but my problem solved. i change the value capacitor increase/decrease

[@xierxu]

I need 30V 50A out. It does not work in simulation.

[@TechStudyCell]

No it will not work. Output range in Mill Amps.

[@xierxu]

@@TechStudyCell Thanks for responding, but I figured it out. 30V at 46A is as close as I can get before the voltage collapse.

[@burraqmagnetmotor]

add two bipolar transistors as we know darlington pair..gain current as you like

[@veeraragavan3948]

I NEED 12V 3A TRANSFORMERLESS POWER SUPPLY SIR.

[@TechStudyCell]

It's better to use SMPS power supply

[@afgamer5576]

I req56 v sc and 500 ma

[@yatinparmar6122]

Hindi me bataye hote to bahot kam aa jata yah circuit😔😔😔😔 How to use pf valu in 24 volt???

[@stephengiacobozzi250]

that not going that is 230 my v is 120

[@АбдулмажидМеджидов-ш8ш]

Дуца бицунеб жо дида бичlуларо

[@UnknownPerson-nl7te]

You used a capacitor dropper circuit which is not galvanically isolated from mains voltage,means if components fail high voltage will pass and making it is useless,you can buy an adapter for the job for about 100-200 rs.,why destroy your circuit for 100-200 rs.? you have decent subs and get decent views,don't go for money by clickbait views

[@nandikoyalkar5079]

What is the value of bleader resistor

[@rsubram24]

The AC and DC capacitor name are not clear. Please write with voltage limits.

[@jboy4real]

How did you calculate the value of the bleeder resistor and the 100ohm/2watt resistor in series with the neutral and the value of the smoothing capacitor

[@rajeshkumrpshah]

Sir, R1 &R2 are 270 k but in video u r telling 220 which is right? U r using one 2w resistance but in in details u have written 1 w what is correct ? Pl explain regards nice tuitor

[@ABZTRONICTUTORIALTo]

Remove the load n check the output still high voltages only the current very small it will not give any lower voltages except the zener

[@inothome]

Good description of a capacitive dropper but too many annoying pop-ups to subscribe, share and comment.

[@prachethire812]

thank you, can we power a microcontroller using this supply

[@Radhasony4726khan]

How can change DC polarity for Motor reverse Forward?

[@کامیاب-و7ز]

hey dude does bleeding resitor require any calculations ?

[@antivenomgaming841]

Can you tell what are load limits, how much amp i can get max?

[@aliyychannel4764]

Very cool project...but I really dont know what the function of R3?

[@rahulwaghmare6370]

Ur schematic n ur pcb is diffrent In schematic u have not shown the value of blender resistor No discussion on zener diode 1/4 or 1watt????

[@babysharmila1244]

I want pcb board with components another one 12v pcb board with component.

[@gopin471]

Thank you very much for this clear video, Now I understood how my home rechargeable torch light works. I am becoming fan of you. :)

[@Sandhu1977]

Sir plz help transformer less 12v supply my filter capacitor is heatup what reason

[@krishanubiswas9157]

Good. But the circuit is shock hazard at dc point which is very dengerus..

[@richardwright2461]

What determined the value of C2 and R3?

[@seeithappen1]

why not use a thyristor - - gives much more output power

[@Aathif_Rahman_M]

Can you pls snd gerber file and circuit diagram

[@coresoftandroid2801]

Eski life kitni hogi agar ese regular supply (24x7 h) ke liye use kare

[@mariafincham5847]

Simple, Salvy. An L7806 is more costly than a zener

[@UjjualK]

Can you please send me the pcb board link

[@ishaservices]

Sir good morning, no Gerber file in description ?

[@sekharhembram6695]

How much is the self consumption of power

[@javiercavo1]

Hi! the voltage at point B is much lower than the voltage at point A because the capacitor C1 has no time to completely charge?? If Im right, is not this ciruit dangerous? because if the capacitor breaks, the voltage in the output is too big... (Im not sure if the zener can keep it low)

[@ABZTRONICTUTORIALTo]

The output still almost 200volt with out a zener

[@ishaservices]

Can you send me 20 number pcb by cash?

[@afgamer5576]

I requieed 60 v possible

[@TEACHELECTRONIC]

Circuit diagram and map???

[@honestshop1994]

Send pcb pakistan?

[@honestshop1994]

Send pcb pakistan?