How to Build a 12V, 15W SMPS Circuit on PCB

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For the detailed explanation of building this 12V 1A SMPS Power supply circuit, visit: circuitdigest.com/electronic-...
A Brief Overview of 12V 1A SMPS Circuit:
Every Electronic device or product requires a reliable power supply unit (PSU) to operate it. Almost all devices in our home, like TV, Printer, Music Player etc. consists of a power supply unit built into it which converts the AC mains voltage to a suitable level of DC voltage for them to operate. The most commonly used of type of power supply circuit is the SMPS (Switching Mode Power Supply), you can easily find this type of circuits in your 12V adapter or Mobile/Laptop charger. In this tutorial we will learn how to build a 12v SMPS circuit that would convert AC mains power to 12V DC with a maximum current rating of 1.25A. This circuit can be used to power small loads or even be adapted into a charger to charge you lead-acid and lithium batteries.
What are the design considerations and how to build it, check out this power electronics tutorial with detailed coverage of circuit and PCB design: circuitdigest.com/electronic-...
Visit circuitdigest.com/power-elect... section for power electronics news, articles and projects.

[@BinuMadhav.NetWork]

So professional with great clarity on what has been said!

[@turkuas23626]

You spent a good amount of time makin this video and deserve a thumb up!

[@Circuitdigest]

Yay, thank you!

[@sameerk12982]

Thank you very much for this easy to understand and very helpful video.... Subscribed.

[@narender64]

Very good explanation crisp n clear without unnessary bla blah found with other videos !

[@scooter9278]

Excellent explanation. Love how you move between the schematic and actual circuit. Please make more!

[@jeffersondane1554]

Sorry to be so offtopic but does anyone know a way to get back into an Instagram account? I was dumb lost the login password. I love any assistance you can give me

[@connorlorenzo2162]

@Jefferson Dane Instablaster :)

[@jeffersondane1554]

@Connor Lorenzo Thanks so much for your reply. I got to the site thru google and Im trying it out atm. I see it takes quite some time so I will get back to you later when my account password hopefully is recovered.

[@jeffersondane1554]

@Connor Lorenzo it worked and I finally got access to my account again. Im so happy:D Thank you so much, you really help me out!

[@connorlorenzo2162]

@Jefferson Dane Happy to help =)

[@plamenpetkov7132]

Slots are helping with blocking surface currents (especially if surface not coated)

[@user-wq1nm4lc7q]

Wow... Good stuff man... Clear voice.. Explained in detail... I liked it.

[@Circuitdigest]

Glad you liked it!

[@rahulgirase527]

One of the best video. Thanks a lots 👌🏻👍🏻😇

[@smartdesignengineering]

You are doing a very good job. Please make more video with full explanation of circuit. Please make a video on how to make a dmx to RGB decoder circuit. Please sir

[@ramun3872]

Clear idea about smps

[@krishnaawasthi661]

Can any plz tell what is the model and ratings of switching tranformer used

[@noerazo38220]

Aprendí más con tu video y eso que no entiendo tu lenguaje que bien explicado y buen video de veras muchas gracias

[@rfviratsingh]

Dear how can we convert it to 12V 2A power supply?

[@tonymjawahar]

Pls., can you suggest a circuit for 7.4 volts DC output?

[@plamenpetkov7132]

The two 1 Meg resistors are part of the start up circuit

[@swapnilbandgar8730]

Pls tell me, what is that black cylindrical part on board between i/p and o/p, Near to red Capacitors...? I have one more query... I have 48v, 40Watt SMPS to drive LED panel, which is not working... I want to repair it? Observation... 1. Power Resistor at input side was found faulty, I replaced it... Observation... 2. When I switch on the supply, I get output voltage 58V and drops to 1 volt in a minute... Please help me to learn the things...

[@amarnathsharma1657]

there are some errores in gerfile Unable to identify the layers due to the non-standard filename Can not identify the board outline 12V_15W.dri(null): Non-gerber274X/excellon formats 12V_15W.gpi(null): Non-gerber274X/excellon formats 12V_15W.mec(null):Unrecognized Gerber file

[@HiteshKumarTiwari1604]

Very nice video and explanation

[@holywar77]

I don't have the P6KE200A, so can I omit it?

[@ashwinkumark1400]

What was the total cost of assembly (including pcb)

[@fixnreview]

Man your good!

[@electronic7979]

Nice and useful video 👍

[@zakaullahkhan3760]

how we detect wattage of any led driver

[@sanu7210]

Whete i got those parts ?

[@JasonRobards2]

Excellent explanation.

[@Circuitdigest]

Glad it was helpful!

[@imrapatel1]

Great video

[@usrrsr]

Can i use it for 5 v 3amp with modded transformer from pi expert and changing output rectifier 1. Can you share pi expert design file 2. Can you give pcb source file or pdf for toner Transfer 3. Gerber file is corrupted, jlpcb site is also not able to import it check 4. Ferrite transformer air gap requirements missing

[@aniketrajput3258]

Sir can I get the blank PCB from you

[@elamparithiparithi3344]

Did you paid custom charges for pcb?

[@varaprasadpetloju]

Good explanation .... Attractive voice

[@cw752]

I wondered what would happen if I use a different 18 uF 400V Cap for C1? (same for C2 and C3) at some shops I can only order like 200 pcs, thats a huge number of power supplies for me as a hobbysit ;)

[@shrijithmjain2137]

This is a phenomenal explaination thank you a lot........if we want to use the circuit for higher ampere say about 3-5 amps.....what changes are needed ?

[@Circuitdigest]

5 Amps is a really large current, you have to change the complete design from the switching FET to the transformer. If you want any tips you can try discussing on our forums circuitdigest.com/forums

[@arunkumarr728]

Bro to design this circuit 6mH,1.6A common mode choke is not available can you suggest me any alternative for that

[@Circuitdigest]

Not sure if I can help you here, you can contact the author of this project by posting your question on our forum circuitdigest.com/forums

[@Suvro1976]

Sir can you please tell how can we increase the current of the same circuit by changing the value of components.

[@raghavmalik89]

I saw your message so I thought to take the liberty to reply. Increasing current you will need to check the following: Need to check transformer rating for this and since this PMIC has an inbuild transistor so that will have its limitations then you will need to look into other supporting circuits like snubber and rectifying side.

[@user-hg2sm6wq6v]

Excellent video, may I ask what components should I change if I need more current?

[@Circuitdigest]

This design is for 15W, if you need more power it needs major design changes. What current are you looking for? You can try asking the question to the project author he is active on our forum circuitdigest.com/forums

[@samalashivasurya5574]

Is it correct to get Feedback with out voltage divider connection by connecting two resistors

[@Circuitdigest]

Voltage divider only maps down the feedback voltage, why do you think it is important here ?

[@kamleshchavan7451]

Sir can it be possible for you to explain the working of 433 MHz transmitter and receiver module circuit diagram, in the way you explained the smps power supply circuit

[@Circuitdigest]

you can check this out circuitdigest.com/electronic-circuits/rf-transmitter-and-receiver-circuit-diagram

[@yaseenhashim8538]

thanks

[@rajendrarajkumar6483]

Sir pl. Hindi translat video

[@arunkumarr728]

Bro can you please tell me which software do you use for designing schematic(Circuit Diagram) in this project

[@Circuitdigest]

You can use any spice software

[@raghavmalik89]

Also KiCad is free

[@briankoton845]

excellent attach a link for the photo of that circuit you've drawn on paper kindly

[@briankoton845]

i've seen it thank you

[@SumankRoy-xe1kt]

Sir plz post a vedio for the flyback transformer and how to increase the current rating of the smps

[@Circuitdigest]

Stay tuned at circuitdigest.com, an article on how to build a fly-back transformer is coming soon.

[@Circuitdigest]

circuitdigest.com/tutorial/how-to-design-your-own-transformer-for-smps-power-supply-circuits here is a video on how to build your own SMPS circuit

[@AmitGupta0985]

can we give 250V AC to direct diodes? i have confusion. please clear. thanks

[@Circuitdigest]

please post your questions on our forums circuitdigest.com/forums to get them asnwered

[@raghavmalik89]

You can and you do that in case of SMPS for having rectified DC which is then switched according to need. what you need to look for is big bypass capacitor that is the expensive one

[@rahulgirase527]

Brother 1 questions I've. Can we you VIPer22A

[@Circuitdigest]

circuitdigest.com/electronic-circuits/12v-1a-power-supply-circuit-using-viper22a check this out if you want to use viper22A

[@missf2ptrap587]

24v 3amp how to convert it

[@raghavmalik89]

that is 72 Watt system a different beast. You will need to change alot of things. PMIC, dedicated switch and transformer

[@plamenpetkov7132]

It is actually called common mode filter, not pi

[@Graham_Wideman]

3:50 I think there's a mistake here. The component L1 is not a simple inductor that would make a pi filter with C1 and C2. Instead L1's two inductors form a transformer, and it's connected with both dots facing toward the input. That means that it presents inductance to common mode noise (ie: same unwanted signal voltage on both input wires), but presents almost no inductance to differential signals. Meanwhile, C1 and C2 are connected to filter differential noise, and would operate as a pi filter if only one of the windings in L1 was present, but with the common mode connection of the L1 transformer, they do not form a pi filter. So the overall effect for differential noise, I believe is as though C1 and C2 are just in parallel with each other, and there's no series blocking inductance, and the only effect of L1 is to block common-mode noise. So my conclusion is that the designers intended this to be a pi filter, but made a mistake. Or, possibly L1 is actually not wired for common mode, but instead the dots should be shown on opposite ends of the coils -- but then why not just use a single L1?

[@d614gakadoug9]

That is a very unusual position in the circuit for a common mode choke. CM chokes wound in the way that one is typically _do_ have some normal mode inductance that can be useful. The NM inductance is typically small and not very well defined. However, electrolytic capacitor impedance at the noise frequencies of interest is usually high, so the attenuation of the noise is poor. Normally a CM choke is between the AC input and the bridge rectifier and X and Y capacitors with good high frequency performance are used "adjacent." There are no X or Y caps in that circuit at all. I doubt very much if it would pass conducted noise tests to meet any standard. If a CM choke such as that were connected to use it as a simple inductor it is very likely that it would saturate at quite low current. The cores are typically very high permeability (5000 to 10 000) and are ungapped. Judging by the metal part on the core, I'd guess the core is a U-U type, so there will be some minute unintended air gap.

[@zombieateet]

Hi buddy! Nice video very informative content! Hey I have a doubt? If I need to make a circuit where power source is 12v and 10amps and a load of 12v with 6amps with two fans of 12v 0.18A and 12v 0.08A. Can you tell me if there is a need for other components like resistor and capacitor or anything else to complete the circuit? I am a layman so please share your thoughts.

[@chetananam475]

Since your source has a voltage of 12 volts & your loads also operate on 12 volts, no resistors or any other components are required. Also as your total load current is around 6.26 amps or so which is less than what your source can supply ( 10 amps), you can easily use your supply with the loads mentioned. I also assume that you want to use a power supply & not a battery of 12 volts. So, you can use the given source & loads without any additional resistors.

[@zombieateet]

@@chetananam475 thanks Chetan, I was talking about 12v car socket as source...

[@chetananam475]

@@zombieateet hope I was clear. Car socket dies not power anything- a battery or supply gives the required power. You say that a car socket is the source. I cannot clearly understand. If you have any doubts, do let me know.

[@zombieateet]

@@chetananam475 yes, my point is that the car 12v socket is connected to car battery right. The car battery is the power source.

[@chetananam475]

@@zombieateet The 6 ampere load is very heavy for a battery of 10 amperes. It will heat up the battery & reduce the life of the battery. The backup time will also be low. The voltage will also reduce as the battery discharges. So it is preferable to use a regulated power supply of 10 ampere rating @ 12 volts or the battery must have a higher ampere hour rating like 20 ampere hours or higher.

[@bengkelelektronikkita974]

I think the schematic and PCB aren't the same, please focus on pin 1 of optocoupler, clearly in PCB shows that pin 1 has connected to 2 resistors (R4 & R5) whereas the schematic shows that pin 1 only connected to only R4, which is which?

[@arivnidunami3047]

What is this circuit called, flyback or what...?

[@d614gakadoug9]

Yes, it is a flyback converter.

[@tejasnagrale5861]

Sir give the component value and name also quite

[@Circuitdigest]

visit link in description for circuit diagram with component values

[@apurvmj]

It feels different listening circuit as sir-cute instead of sir-kit

[@shindvs]

I have gone through all Pixi designer 10.1 but I could not fond tiny 2 for your knowledge Thank Nice Video I found in transformer secondary start and end some turns are jumpered please explained it some more doubt rectifier across some resistor capacitor across please explained also Thanks, Lot for Nice Video Beciase so many days I was looking SMPS design Thanks, Lot for Nice Video

[@Circuitdigest]

Please use our forums circuitdigest.com/forums for technical questions. Thanks

[@shindvs]

@@Circuitdigest i ask there too question

[@papaisou11]

@@shindvs I have replied. Thanks once again.

[@Leilektsoglou]

@@papaisou11 Could you send me the link of the answer? Thank you.

[@Leilektsoglou]

Finally did u understand what is going with that? I mean with the jumpers on the secondary?

[@DuroLabs85]

Just put a NTC before diode bridge

[@warunakumara7671]

cant go to detail information section lot of time un wanted subscribe link appear

[@kanchankondhare]

🙏💓🙏

[@muratnaif193]

THIS CIRCUIT 9V

[@Kemchho763]

Pronounce “cirkit “ not circuit as it spell. Pliz

[@subratasubratakumarpanda9919]

Not for work