Part 2 - DIY Lab Bench Power Supply

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PSU circuit board schematic: i.imgur.com/e5...
Volt/ammeter schematic: i.imgur.com/te...
Components list:
Voltmeter/ammeter display: s.click.aliexp...
Binding posts (similar): s.click.aliexp...
Double rocker switch: s.click.aliexp...
Potentiometer knob: s.click.aliexp...
Rotary switch 6 position: s.click.aliexp...
USB port: s.click.aliexp...
10W 47R resistor: s.click.aliexp...
Rubber pads: s.click.aliexp...
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27 сен 2024

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Комментарии : 409

@cosmichasm 3 года назад

seriously, if every video is detailed like this with explanations, then you've got yourself a fan who will like every video!

@robertcartier5088 5 лет назад

Nice followup vid! I very much like how you explain not only WHAT you are doing but also WHY... instead of just filming yourself making stuff silently like so many others do. A small note: I noticed that you use the word "consumer" when speaking about the devices you will connect to consume power. This is technically not wrong at all, but could be confusing to some people because the word is almost exclusively used as a generic reference to anyone who buys a product or service. Alternatives: Load or connected device. Cheers from Canada!

@emilracovita8421 6 лет назад

A dummy load is mandatory for ANY regulated smps, because they need a certain permanent current draw in order to properly stabilise the output voltage. The reason because some of them can work without a dummy load connected, is because they already have one, which is the actual cooling fan, instead of a simple resistor. But the better, more expensive ones have the fan connected to a separate winding of the chopper transformer, because otherwise, the fan circuitry may induce unwanted noise in the computer power rails, and their dummy load is a resitor, or if the fan is directly connected on the general 12v output, a series voltage regulator ic and a lower voltage fan are used.

@ventiladordesuco 6 лет назад

I was about to ask exactly this, if I could use the fan instead of a power resistor

@emilracovita8421 6 лет назад

fernandoanimator you can, but add another 1500-3300uF low esr capacitor and a 100nF capacitor in paralel with the fan to filter the noise.

@khaleef_hrm 5 лет назад

I was following the video to build one, my PSUs (actually building 2) have built in Fans. According to the video, he used a 10w 43ohms choke resistor but I could only get the 10w 47ohm, I took it because I thought the difference isn't much. Now when I connected the resistor to the 5v rail (red wire) and Ground, the resistor heats up so much that it began to smoke badly and I quickly have to turn the PSU off. Tho I noticed, the outputs of my 3.3,5 & 12 was active even without the dummy load resistor. Does that mean my PSU don't need the Dummy load?

@roppeca 4 года назад

A very good explanation about " dummy load "...very useful...thanks for sharing !

@waltercomunello121 6 лет назад

I appreciate very much this follow-up video. So you're not using the rotary switch to change between outputs, but only to measure voltage and current. (This much I understood right after I watched your tutorial and I was like "huh?") Your V/A multimeter is different from mine, though they have the very same case. Connections on mine are way different so I had to work them out by myself with some help from the Net. It went well in the end (though I had some shorts here and there, or wired them plain wrong). Generally speaking, ammeters are to be connected in series with the load, while voltmeters must be plugged in parallel. The rotary switch just makes things a little more interesting, though my schematics isn't so different from yours. Figuring out how to actually wire them up in real life is sometimes a pain for people (like me) who try to hack a PC PSU into a bench power supply as their very first electronics project. And it taught me a lot of stuff. Also, I was "shocked" once by those big caps while testing the PSU to see if it was working, so I learned my lesson: never mess with electrical energy. Thanks for the tips on how to discharge them.

@ekleko1 4 года назад

It's just for Voltages, the Ammeter will display any current being used.

@eddycouvreur3277 4 года назад

For the problem of the selector you talk about at 6:25 : Just put 470R resistor on each cable to the selector (3v/5v/12v...), not the common pin of course. And so, the power supply won't shut down. And thanks for this excellent tutorial. ONLY USE this tip if you only use the selector for voltage measuring... If you want to use the selector for output to a Vout terminal, use a better selector without the short-circuit problem.

@colorklimax 6 лет назад

This will be in my DIY project list. I would preferably add step-up boost board so I can have extra variations in my voltages.

@DrZipZwan 3 года назад

As you, I connected the USB port to main 5v (Red Wire) instead of Purple Standby wire. I did not need to shorted together the data Pins of the USB femele, and during some test my phone is drawing around 900mA, while being at 74%, so success!! As you said, this device is for prototyping not for charging device as phones... I used one Main Switch to switch the device instead of 2 switchs, because 2 switchs is kind of boring after a while. I shorted together Green Wire (Power) and some Black Ground Wire, and connected the switch just after the 220v rail. So 1 switch to power the device is neat 😉

@callumcollier-millington6278 6 лет назад

Really great video, perfectly explained and a great follow-up to all questions from your first video! Subscribed

@MrRvdbeek 5 лет назад

I did it all over again. And it works great. There is a problem when I connect the usb. The Amps are not working so I swapped the grnd from the usb to the other side of the big grnd cable and it works great now thank you 🙏

@scottsatterthwaite4073 2 года назад

For the North America, there needs to be chassis mounted MAIN circuit protection. Either a fuse or circuit breaker mounted next to the power jack.

@raptors3164 5 лет назад

You have done an excellent job on both parts of your video's. Thank you so much for sharing.

@The52brandon 5 лет назад

Just FYI for anybody building a bench PSU from ATX like this. Nowadays you can find breakout boards that do all of the work for you on ebay. I picked up 4 of them for $10 and change delivered (I have no idea how it's profitable. But that's not my problem). They have an ATX (20-pin I think) jack, a power switch, 12V - -12V - 5V - 3.3V outputs, each with a pair of binding posts and a fuse. The only negative really is that with just those wires, you're limited with the output current. But you can just install "high-current" outputs from the rest of the wires on the PSU. At least I think. I'm in the process of trying this theory out along with isolating the secondary in a matched pair that I will then run in series for a theoretical high current 24V output

@OlympusHeavyCavalry 5 лет назад

Nice job. I saw the tutorial for this and liked it as well. Cheers and keep up the good work.

@juliart 3 года назад

You forgot the part about letting the cat pass, but I guess that doesn't need any further explanation xD ! great video. gave me the confidence to proceed with one of my DIY projects.

@wayneo7307 5 лет назад

Great Explanations , Thanks . Great Video ! Much Better than Most.

@dr.iqbalqureshi9964 4 года назад

Your tutorial is very very good, better and best for our knowledge, we are now able & enable to make ATX Bench power supply for our home use. So that I am v. Thankful to you.

@amitgogia6999 6 лет назад

Hi Sorin, I am subscribing you today as I think you deserve it due to your knowledge and creative PSU designs, good work..

@nalinchawda 3 года назад

Excellent explanation throughout the project ....Keep it up

@riloariichoariicho884 5 лет назад

Every RU-vid tutorial video should be like yours.the first one is good.but this one is excellent, detail and well explained.thumbs up

@yongyuthmeemuang 3 года назад

very good

@harayz 6 лет назад

connect positive binding post to one of the terminal of the selector switch to add a voltmeter feature

@benza435 6 лет назад

Thanks for following up with an FAQ. Subscribed 👍🏼

@joseantonioperez8273 4 года назад

Awesome very good and helpful video thanks Pal, I am suscribed to your channel long time ago God bless you from Mexico city

@emersonsrandomvideos248 5 лет назад

I liked the fact that you incorporate a USB port in that power supply.

@jimbossemi-customs3129 2 года назад

Love you videos Sorin, keep up the good work! I've learned a lot from you! Subbed and bell on.

@mrdavidurquhart 5 лет назад

I wonder if you could use the hole in the side of the case where the PC leads used to come out as a place to put externally accessible fuses for the posts. I guess it gets evermore complicated. But that hole will turn out to be useful for something. Great videos.

@Sorin_DIY 5 лет назад

hi. that is a good idea. you can probably fit one fuse there. but you need 3 or 4 fuses and it's very crowded behind the front panel. it's more complicated, but not impossible.

@alsemi-back-up579 Год назад

Can You Make a Video on a ATX Power Supply for 24v Battery Charging? Good Explanation of This one! Thumbs Up. Thanks for Uploading

@heimdall8305 3 года назад

u are legend, mate.. love ur accent.

@petersmith5199 2 года назад

Thank you for sharing this excellent video.

@macksuniga9308 5 лет назад

Sorin,I hadn't noticed but you did include detail for parts and purchase. It was hide below the circuit schematics...Thanks again...

@DrZipZwan 5 лет назад

Please create us a voltage Variable Power Supply. I would love to follow your schematic of it. Yt is full of DIY videos, but none are worth yours!! Yours videos/schematics are explaned very well! I already followed your instruction to make a DIY 18650 Battery Charger, and it works like a charm. keep the great work, and hope you will be able to give us DIY videos more frequently. Thanks.

@kirthlycarty8207 4 года назад

Very well explained. I enjoyed watching the video.

@sammy-pp1gl 6 лет назад

I like this projeck ..tks Sorin

@marvinjack5033 4 года назад

maybe its use full to add LEDs on the positive terminal so you can tell what voltage is selected on the meter... yes? or maybe just write something on the selector =D

@SnekSnack 5 лет назад

So basically - Can I use DC-DC step down/up converter (0-30V) connected to 5V line, with two potentiometers, connected to display and have basically variable bench power supply?

@Sorin_DIY 5 лет назад

yes. but I suggest you use the 12V output.

@amitghosh6966 11 месяцев назад

Nice one

@rfunk727 5 лет назад

How would you go about making a variable voltage supply off of the 12v connection?

@Sorin_DIY 5 лет назад

hi. this will also work. but I want to make a separate video with a variable power supply, so I can explain everything about it.

@lwentz5510 4 года назад

Thank you for the followup. Currently building one of these. Although not shown, I assume that you allowed the cat to pass.

@tchrapko 4 года назад

Where do you get a low pass cat filter? Checked Digikey, etc. but couldn't find.

@lwentz5510 4 года назад

@@tchrapko You must first find some catpacitors.

@razvannechifor365 5 лет назад

You are amazing bro THX for doing this kind of videos :D

@akshayghorpade5798 6 лет назад

Best video ...... Love it .....you explain it very easily.....

@MrRvdbeek 5 лет назад

Hello I did the same thing you did . But when I switch it on I feel some current at the outside of the case. Maybe you now what to do. Or what I did wrong. Thank you for the nice looking power supply. Greetings Rene

@Sorin_DIY 5 лет назад

hi. you need to check the circuit board and all the connections inside the case. probably a wire or an imperfect joint it's touching the case. or you can use it in a grounded outlet.

@MrRvdbeek 5 лет назад

Sorin - DIY Electrical Nerd I Will get it open 😩 and check it again. It’s so hard to get it closed again Letting you now when I find something wrong. Thank you for the reply

@MrRvdbeek 5 лет назад

There was a solderpin from the board touched the outside of the case when I closed it so that is solved now. When I did use it for testing something I have the 3.3-5-12volt but it displays no Amps and that’s why I made it. I want to now the Amps. So I did look to the schematic and I did exactly what it said. But no amps.🤔

@Sorin_DIY 5 лет назад

try to reverse the 2 thick ammeter wires.

@njfulwider5 6 лет назад

Great Explanation!!

@smash7777- 6 лет назад

Really good videos, part 1 & 2! This stuff is still a bit over my head but it's good to watch and is something to aspire to. I don't think it will be too long before I am trying things like this so really good stuff! Thanks for sharing! 👍

@stingerbold9327 4 года назад

Don't worry bro i am only the person from the previous video to knew that you are using that rotary switch for three output voltage wires to connect a single volt and amp meter still having those 3 banana outputs

@chrisvdsvuurwerkjunky7161 4 года назад

clean and clear bro

@damianregis1568 5 лет назад

I love the design , it shows some creativity with something that's technical. I have one question though... Is it possible to use this design for a voltage stabilizer at 13.5 volts and up with a few modifications?

@Sorin_DIY 5 лет назад

hi. you need a powerful step up converter connected to the 12V output. and instead of the rotary switch, use a potentiometer for the step up converter.

@rborissov 4 года назад

Will be great to have short protection circit.

@AlexBGj Год назад

Salut Sorin, I'll write in English in case others have the same question. Can you use this to charge multiple 12v batteries at once? I need to charche some 12-20ah lithium ion ones, and some 12v 7-10ah lead acid ones.

@Sorin_DIY Год назад

Hi. you can use this power supply, but not directly connected to the batteries or li-ion cells. you need to add a CC/CV converter for each battery/cell. for example for a 12V lead acid battery you need to set the charging voltage to 13.5~14V and limit the current to 10~25% of the battery capacity.

@КостаСтојановић-о8х 2 года назад

If I have a psu with 2 12v rails with 19A, and a 5v rail with 20A where shoud I put the load resistor?

@familybrown2283 4 года назад

Hi Sorin thanks for posting these informative videos. I had a look at your variable voltage power supply video but that's a very different build to this. My thought is to use a XL6009 step up module as an output off the 12V rail of my ATX bench power supply build to charge 14.4v (4S) and 18v (5S) rebuilt Li Ion drill battery, what do you think? addendum: FYI my old ATX PSU had a pink wire! Turns out (after a bit of browsing) to be a sensor wire for the 5v rail, similar to the brown wire for the 3.3v rail. Treat in the same manner.

@Sorin_DIY 4 года назад

hi. yes it will work. but for the 4S battery pack I think you need 16.8V. you should read the datasheet of your cells and BMS board. if you don't use the original BMS board of the drill, you need a good BMS for this type of conversion. also the step up converter IC will get very hot, so you need to add a heatsink.

@familybrown2283 4 года назад

@@Sorin_DIY Thank you that's great advice. And it's no problem to get the V and A showing on the led meter via the 6 way switch, same connection as the other outputs? I ordered a 20A 4S board (ebay # 202393983053 ), still hasn't arrived yet! Then later I watched DIY Tricks&Tips video FN0mx5n4ocA. The first board he used cuts out when the drill starts. But I think it depends how you set it all up - if you check his circuit diagram 4.30mins, the power for the drill is off the output points on the BM board. If the power for the drill is wired direct, not through the board, then this can't happen right? However then you won't get the protection benefits of the board (discharge limit etc)? I noted that in your (excellent) drill pack rebuild video you just used a pretty low rated board.

@computerjantje 6 лет назад

Thank you very much

@bavact1587 4 года назад

I have a atx power supply of 450W. When i connected a 12v/35W car headlight lamp to the 12v supply of my atx power supply the voltage suddenly drops from 12.1V to 10.1V while the lamp only consuming 2.5A current.why this happening? Note - i have only used single yellow wire and single black wire.

@KylesCarsYT 5 лет назад

'Here you can see the same phone with the same USB lead' S *notices its the same phone but it is a different USB lead. The original one had a curve on the one side with the lead going into the phone connector off-central. The 'new' lead had the more commonly seen central cable with both sides straight.

@Sorin_DIY 5 лет назад

hi. it's the same USB cable, I don't know what you think you see. it's not a conspiracy. in fact you can use any USB cable you want, I just wanted to point out, that the 5V red wire has more current than the 5V purple standby wire.

@KylesCarsYT 5 лет назад

@@Sorin_DIY I understand with the current output, however the USB cable is definitly different. You can't say its the same cable when it clearly is different for the fact that the connector to the phone is a completely different shape?

@arrevunella 6 лет назад

Hi, thanks for the wonderful explanation, I have all the components available but I have only a 47 ohm 10W resistor, can I use that?

@Sorin_DIY 6 лет назад

yes, it should be ok.

@arrevunella 6 лет назад

Thank you Bro, I completed the power supply today :) the aesthetic is identical to yours, it has only two clamps and an extra potentiometer because I added an adjustable 12v output using an LM317 that I had at home.

@elhatillanodigital5011 4 года назад

Hi, it would be a great idea to place this really nice proyect in a Facebook electronic group as to know exactly the parts we will need and all the process. Thanks

@elhatillanodigital5011 4 года назад

Please, is there a place on the web with the diagram and procedure to build this regulated power supply, I have a lot of this and would like to give them a new life, also I have a 12 volts transformer and would like to build a linear variable power supply, any recommendations to look for the circuitry will be very much appreciated. Regards from Venezuela

@kuyapolan22 3 года назад

how to adjust or control the ampere of the power supply in each of the voltages? thank you

@Sorin_DIY 3 года назад

hi. this power supply cannot limit the current. I built a separate variable power supply with current limiting feature.

@techbarron7383 5 лет назад

And can u make this atx as a adjustable output,? Because I I'd like to have one,for my work shop,some videos are hard to follow,you have an excellent explanation,so that it is so easily to understand,please,make it.

@Sorin_DIY 5 лет назад

hi. I will soon make a variable power supply.

@techbarron7383 5 лет назад

@@Sorin_DIY thank you,o don't want to let burn my last atx power supply,I have 5 before,it all burns,by making on it,.

@christevelab 4 года назад

@Sorin - DIY Electrical Nerd ammeter reads each volts when knobs is turned, but when i read amps. Each channel is reading same amps. Amp do not change once I turn knob to other devices. Did I hook something up wrong?

@Sorin_DIY 4 года назад

Hi. the volt/ammeter is connected correctly. the rotary switch changes only the voltage measurement. the ammeter is connected on the ground wire of the power supply (with its 2 thick wires). the ground wire is common to all the outputs, so the current measurement is also common. the ammeter shows the current used by all the outputs combined.

@christevelab 4 года назад

Ok. Thank you. Is it possible to separate each amp readings without getting complicated?

@Sorin_DIY 4 года назад

no. only if you find a high current switch.

@egorgozdak9767 4 года назад

Здраствуйте,а зачем вы белый большой резистор припаяли к 5 вольтам?

@Heinz6566 4 года назад

Hello, is the Green Switch necessary, or is the Red Main Switch sufficient for the whole system? Thank you

@Sorin_DIY 4 года назад

hi. if you solder the green wire to the ground, then you need only one switch for the mains.

@regis2424 2 года назад

Hi, i would like to do it with a variable voltage and ampère separate, With Two potentiomètre or one with a switch to sélect volts or Amp. And also can i put 2 other potentiometer inside for calibration . Nice vidéo be the way 👏👏👏 Thank’s

@christevelab 5 лет назад

Might have been answered already,. But can you run power on all outputs or only what knob has selected?

@Sorin_DIY 5 лет назад

hi. all the outputs are powered on in the same time. the rotary switch only changes which output is read by the voltmeter.

@christevelab 5 лет назад

@@Sorin_DIY thank you, great video btw.

@christevelab 4 года назад

@@Sorin_DIY ammeter reads each volts when knobs is turned, but when i read amps. Each channel is reading same amps. Amp do not change once I turn knob to other devices. Did I hook something up wrong?

@janikainulainen4360 4 года назад

Thanks for great instructions. I have hard time finding 10w 43r resistor. What do you think if i add 2 10w 20r resistors in a row?

@Sorin_DIY 4 года назад

that will work.

@Ottonic6 3 года назад

C'mon! You wait for a month cause you order from E bay and it comes from China. You can spend a couple (maybe) more $ and get it sometimes the next day from Amazon.

@giancola123 4 года назад

Can this type of computer 🖥 power 🔋 supply be used to make a car battery charger? With the range of volts on like yours, 3v, 5v and 12v, can it be used to restore a flat car battery with about 2 to 3v with selectable current levels too? If not, can you do a vid showing how to make 1 with those specs that also uses a relay circuit that turns off the charger once the battery is full please.

@Sorin_DIY 4 года назад

hi. it's not that simple to charge lead-acid batteries with a PC power supply. you need to limit the current, otherwise you will damage the battery or the power supply. even if the battery is almost dead, you can't connect it directly to 5V. I think the best way is to use the 12V output with 2 powerful step up and step down converters, with current limiting. if the battery has less than 9V, you connect it to the step down converter and slowly charge the battery to 12V with a limited current of a few amps. then you connect it to the step up converter and continue the charging to around 13.5V (depending on the battery) with the current limited to a few amps. a better choice to charge a lead-acid battery is my variable power supply.

@Danto7 6 лет назад

Great videos! Thank you!

@ionut.666 4 года назад

Salut, Sorin! Tocmai am comandat o sursa de tensiune noua pe care vreau sa o transform intr-o sursa similara cu a ta, insa am o intrebare: cum imi pot da seama daca linia de 5V are nevoie de un rezistor sau nu? De asemenea, cum pot diferentiez culorile pentru liniile de 5V si 5VSb fara sa conectez sursa la o placa de baza? Sau merge sa o pornesc si sa masor tensiunea intre GND si fiecare culoare?

@Sorin_DIY 4 года назад

salut. daca e sursa pentru PC ar trebui sa aiba aceleasi culori pentru iesirile de 3.3V, 5V si 12V. daca nu au aceleasi culori, trebuie sa le masori. rezistenta se conecteaza la iesirea cu cel mai mare curent.

@khaleef_hrm 5 лет назад

I'm presently building this. I couldn''t get the 10w43ohm dummy load resistor. I could only get 10w47ohm, when I soldered it in and power the PSU, it gets very hot and begin to smoke, I have to quickly turn it off. How do I fix this please? Here a are some things I did differently, the red indicator for the PSU was connected directly to the 3.3v rail since it's a 3v led.

@Sorin_DIY 5 лет назад

hi. the 47ohm resistor is ok. but did you connected it to the 5V rail or the 12V rail? it should be connected to the 5V rail. you can connect the LED to the 3.3V rail, but you should still put a resistor in series with the LED. otherwise the LED will be very bright and may even get damaged in time. you can try the LED with a 100ohm resistor.

@khaleef_hrm 5 лет назад

@@Sorin_DIY I connected the dummy to the 5v rail.

@anydiything 4 года назад

thank you so much.

@poseman13 5 лет назад

love your videos

@taimoorkhan90 6 лет назад

Very nice sir

@Bernycoty 4 года назад

good job! the same with boost 24 v!!!!!

@gregmilstead1369 4 года назад

What kind of rotary switch is that I ordered one from eBay and look just like that one but they sent me a piece of junk instead can you help me out on that

@Sorin_DIY 4 года назад

hi. I bought the rotary switch from a local store, but you can use this model: www.aliexpress.com/item/32820242124.html?spm=a2g0o.productlist.0.0.39da4651FgNyNk&algo_pvid=392b7eb8-a901-4ef2-a8f2-4703480355b9&algo_expid=392b7eb8-a901-4ef2-a8f2-4703480355b9-0&btsid=0be3769015936818258578418e1df6&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_

@imonw3b 5 лет назад

Nice! Any link where can I buy the wire stripper plier and materials used in this video please?

@Sorin_DIY 5 лет назад

hi. I've bought the components from a local store. but you can find similar components on aliexpress. here is the link for the wire stripper: www.aliexpress.com/item/Automatic-Cable-Wire-Stripper-Stripping-Crimper-Crimping-Plier-Cutter-Tool-Diagonal-Cutting-Pliers-Peeled-Pliers/32700817226.html?spm=2114.search0604.3.61.4bec3d1dcdlwof&ws_ab_test=searchweb0_0,searchweb201602_3_10065_10068_319_317_5733915_10696_10924_10084_453_454_10083_10618_5733715_10920_10921_10304_10922_10307_10820_10301_10821_537_536_5733815_10059_10884_5734015_10887_100031_321_322_10103,searchweb201603_51,ppcSwitch_0&algo_expid=8ff52902-2db5-45b4-a36e-4f9fa7c43b52-12&algo_pvid=8ff52902-2db5-45b4-a36e-4f9fa7c43b52

@Sikandarshah. 6 лет назад

Nice bro for explanation

@e.a297 3 года назад

Hi, can i connect 12v and 5v together and then use a DC to DC module to get more power from atx?

@Sorin_DIY 3 года назад

no, you can't connect the outputs together. you can use a DC converter on the 12V output.

@geoffroy9659 3 года назад

Hello And thank you for this video very well explained 👍 I subscribe even without your language, sorry 🙏 😉

@ianbarrow3642 10 месяцев назад

Hi question, what dummy load should i use for a 500w power supply (the 5v and the 12v both provide 30amps). Also which one should i connect the dummby load to? (5v or 12v)

@Sorin_DIY 10 месяцев назад

Hi. you should connect the dummy load to the output which you use more often. it it is the 12V output, you can connect a 10W 68R resistor.

@ianbarrow3642 10 месяцев назад

Thank you very much. I also wanted to ask, The power supply is a X Tech ATX12V V1.3. Does this have short circuit protection? Or would I need to add a fuse to my project to protect it? @Sorin_DIY

@pra_estradanadobloRs_vamos 3 года назад

Parabéns amigo gosto muito de eletrônica ficou muito show tuas fontes abraço!

@GiullianoMoraisPires 4 года назад

Good night. Dear Sorin, I saw the first part and would like to understand the second, but I do not understand the language used in the video. I ask to release simultaneous translation. Thank you. Buona notte. Caro Sorin, ho visto la prima parte e vorrei capire la seconda, ma non capisco la lingua usata nel video. Chiedo di rilasciare la traduzione simultanea. Grazie. Noapte bună. Dragă Sorin, am văzut prima parte și aș dori să o înțeleg pe a doua, dar nu înțeleg limba folosită în videoclip. Vă rog să eliberați traducerea simultană. Mulțumesc.

@AbideinChristFully 6 лет назад

I'll leave this one for you smart people.

@christevelab 4 года назад

My power supply fan runs slow, is there a way to speed fan up, by removing what regulates it . Like temp sensor or resistor? The board doesn't read the temps on my added device's and kick fan up higher

@christevelab 4 года назад

Found it..thermistor.. i just relocated it to what gets hot first.. works perfectly.

@Sorin_DIY 4 года назад

if you want it to have a fixed high speed, you can connect the fan directly on the 12V output and it will run on max speed. and you can add a few diodes in series with the fan to decrease its speed a bit.

@christevelab 4 года назад

@@Sorin_DIY I had to change some things around.. Had dummy load on 12 v ( was shutting down after a few min) moved it to 5v. Then i had two 12v rails wired together, separated and now it runs brushed rc motors.... the psu has mutliples 12 and 5 volts wire groups.. not sure what for. So I just used one geoup on each 5+ 12+.. doing much better.

@soldiers303 4 года назад

i was planning on buying a lab power supply but this looks much more fun. Will i be able to control how many amps i can put through?

@Sorin_DIY 4 года назад

not with this power supply. I made a separate video with a variable power supply with current limiting.

@soldiers303 4 года назад

@@Sorin_DIY looks a little complicated for me. want to start with something more simple. if the power supply i will use is rated at 5v 13amp And the device i want to power is 5v 5amp for example will it power it at the max 13amp or it will draw only what is required?

@Sorin_DIY 4 года назад

the load will draw only what it needs.

@greierasmusicstudio 3 года назад

Salut Sorin! Cum pot lua legatura cu tine pentru un proiect ?

@Sorin_DIY 3 года назад

salut. poti sa imi trimiti un email - sorin.electrical.nerd@gmail.com

@user-yy6tm8qr8c 6 лет назад

Very good follow up video. Could you please provide the resistor & diode specifications thank you.

@Sorin_DIY 6 лет назад

hi. the dummy load resistor value depends on the power supply needs. most PSUs will work fine with a 10W 22-33ohm resistor. but what diode are you referring to?

@user-yy6tm8qr8c 6 лет назад

Hi Sorin thanks for replying promptly. I'm referring to the LED & current limiting resistor.

@Sorin_DIY 6 лет назад

it's a simple 3mm LED. the resistor's value should be 470ohm.

@user-yy6tm8qr8c 6 лет назад

Thank you Sorin, very much appreciated.

@jaspanopio4550 4 года назад

Tutorial Legend

@JudeEstrecho666 4 года назад

any update on this. can you add a step down on the 12v so that it doesnt have to be just 5v and 12v

@Sorin_DIY 4 года назад

I will leave this power supply as it is, because it's very simple and powerful. but I plan to make another version... a better version, which includes variable voltage, current limiting and other features.

@JudeEstrecho666 4 года назад

@@Sorin_DIY yes thats what i was talking about. a variable voltage. sorry

@danielhorne6042 5 лет назад

i would put car 12v fuses on the case next to the outputs then put a led in parallel of the fuses then when they blow the led lights up ?

@Sorin_DIY 5 лет назад

yes, that will work. you can also buy car fuses with LED's included.

@fernandojosegomes2948 5 лет назад

Hi Sorin, thank you for your explanation and I was able to do a similar lab bench PS even without experience :-). The problem is that with extra wires I´ve added a 12V socket like we have in the cars to connect a vacuum cleaner or to light a cigar but when I connect the vacuum cleaner, the power supply shuts off !! I presume this is because of a peak input current when I connect the vacuum cleaner. What can be done to avoid this ? Thank you and keep up the good work. Fernando

@Sorin_DIY 5 лет назад

hi. you can try to connect a big electrolytic capacitor in parallel with the 12V output, 4700uF 25V. or even 2 capacitors connected in parallel. or you can connect and turn on the vacuum cleaner, before you turn on the power supply.

@fernandojosegomes2948 5 лет назад

@@Sorin_DIY Hi Sorin, thank you so much for your feedback. I follow your suggestion and it worked. I can connect now the vacuum cleaner and also a mini compressor without issues. Thank you again. Kind regards.

@adelamim1310 5 лет назад

i just want to ask in the 1st video you manged to attach two or more from the same wire into one like you did with yellow wires is that not going to plus the current in output and as i know, the laboratory staff doesn't need that much of current .

@Sorin_DIY 5 лет назад

this power supply is useful for testing high current devices, like cordless drills, battery chargers, peltier modules. I will soon make another power supply with variable voltage and current limiting features, which will be used for sensitive circuits.

@adelamim1310 5 лет назад

@@Sorin_DIY thanks man i thought you will never replay to me now you have my sub and other question is the current are assemble ? i mean when you attached the 4 yellow wires with each other is that going to assemble the current like 14+14+14+14 = 56 Am !! or all the wires are shearing the same amount which mean the output = 12 Am means that not every single yellow wire have his own 12 Am ? but they shearing it and the value of one yellow wire is the same as 2 or 3 wires attaching to gather ? i hope you understand what i'm meaning !!! and thanks again

@Sorin_DIY 5 лет назад

all the yellow wires share the same output 12V 18A. on the circuit board they are all soldered together. but if you want to use a big amount of current, one wire will not be sufficient, it will get very hot and it cannot deliver the whole amount of current. you need to use more wires. using more yellow wires is exactly like using one thick wire, so it can deliver all the current you need.

@adelamim1310 5 лет назад

@@Sorin_DIY thanks mate

@DesignBuildFixReview 6 лет назад

The black middle of the three pin connector to power meter is not connected to anything in the schematic is that true?

@AlexandreLeone 6 лет назад

Yes. It is true.

@taunteratwill1787 5 лет назад

Try replacing 'consumer' with "load". Consumer sounds a bit cringy?

@DRtotoley 4 года назад

thank you for you video very helpful!

@michaelcoccojr2513 5 лет назад

Great video! I have a couple questions. I'm having trouble finding your list of parts and sources. Also what is that beautiful hue of green? And where do I find that?

@Sorin_DIY 5 лет назад

hi. I've bought the components from local hardware/electronics stores. but you can find the same or similar components on aliexpress.com. what hue of green are you referring to?

@michaelcoccojr2513 5 лет назад

@@Sorin_DIY did the psu come with the green color stock? Seems like you painted it, I was looking for the paint color

@Sorin_DIY 5 лет назад

the case is painted black. but one room of my apartment, where I film most of the videos, has a wall painted green. so the green reflection you see on the PSU case is from the wall.

@mraeymaekers 6 лет назад

Hi, many thanks for this video! Is it true that in the schematic, there is one error: from the Volt/Amp meter you go to the +5V wire, .... shouldn't you take the black to ground and NOT use the 5V? (because how else would the current flow from the selected rotary switch to ground?). I look forward to making this myself.

@taunteratwill1787 6 лет назад

Maarten Raeymaekers Strange that ALL those who have build this make the same "mistake". Maybe that would get a genius like you to start thinking about it. lol

@Sorin_DIY 6 лет назад

hi. the rotary switch is not connected to any consumer, it's connected between the outputs and the voltmeter sensor wire. the +5v wire connected to the volt/ammeter is the power supply wire for the volt/ammeter.

@Drachenhebron 6 лет назад

also, the reason the black wire isnt used on the voltmeter header is because its already taken care of on the amp meter header, no need for 2 connections as the volt/amp board has common ground