Bench power supply using ATX PSU

[@thecraftsman8387]

Well done, I have something similar in mind, like you I learn by watching, complete novice at electronics and wished I’d learnt it earlier in life. This is a 👏

[@michellascombe]

Thanks, best way to learn is to first watch others to see how it'd done, and then try !

[@MrGovnovalj]

Great job and great video. Keep it up, mate!

[@michellascombe]

Thanks! 😁

[@stewartwilson1662]

Give’s me inspiration! Thank you.

[@pppppp1186]

Very neat project. The only thing I would do differently is to let the whole back of the ATX exposed to the outside. Your project looks clean and professional. This is what I am looking to do for myself. Also, it is wise to limit to 10amp for security and since these meters are much less expensive. About 2$. If you go for 20 amp, it is about 8$.

[@michellascombe]

Thank you for your kind words. Is the reason to expose the back of the ATX to the outside to provide better ventilation?

[@VALDENI-OLIVEIRA]

Parabéns pelo projeto. Ficou ótimo.

[@edsonsanomamanivargas3020]

La fuente se ve buena pero se pudo reducir notablemente los costos por ejemplo quitando los display para voltajes fijos

[@asaprocky8195]

Nice build. Very neat and useful.

[@michellascombe]

Thanks!

[@meddiys6171]

Excellent project, go on brother.

[@michellascombe]

Thanks!

[@chuckvoss9344]

Very nice build. Good job.

[@michellascombe]

Thanks!

[@juanfwidlar86]

very good power supply.... greetings from Mexico

[@michellascombe]

Greetings and thanks!

[@shakyshakeqs]

buti pa ikaw pre, andami mong voltmeter!!! gusto ko rin ng madami kse parang magkakapit bahay!!!

[@trackerdan1]

Nice build! Well thought out and well constructed. Wondering where you got your components and especially the case - it looks like the perfect size! Thanks!

[@michellascombe]

Thanks! I got the case from Jameco. 10”x7.5”x3.1” $9.95

[@trackerdan1]

@@michellascombe Thank you. Been looking for a power supply like this (i.e., not built up in the original PSU case) - I may take a crack at building one up! Certainly looks professional!

[@BjornV78]

Very nice build, but those digital panelmeters need a separate powersupply then from the powersupply you are using as output. With separate powersupply for the panelmeter itself, there is no selfinduced currentdraw. The simplest way to achieve this is by using a small PCB transformator and a DC to DC converter for each panelmeter. Search for Recom / Gaptec / Traco Power DC-DC converter, those look like a relay and cost arround $5 per piece.

[@michellascombe]

Hello, thanks for your comments and recommendations! Please help me understand the effect of selfinduced current draw: The ATX's 5V rail is rated at 9A, 1A higher than what I limit with the 8A fuse. Those volt/ammeter modules are advertised to use a max of 20mA of current each I just measured one spare I have, it is using 11mA. Still, let's use the max 20mA each, the 4 modules I connected to use the common 5V rail would use up to 80mA total to run. So how would the panelmeters affect the 0-to-8A operation of the 5V rail? Thank you!

[@steve6375]

Does this actually work correctly? Those meters use a common negative shunt, so if you have more than one output connected it wont work properly (incorrect current readings). Also you have the thin black wire of each meter connected so it wont measure current properly until you disconnect the thin black wires (the current limit may not work either).

[@michellascombe]

Hello, informative comment thank you! I have used the power supply several times since I finished it, but I haven’t yet used it’s multiple voltage sources at the same time. From what you are saying it is then that the meter readings go out of whack. That’s very interesting, I will run some tests! Someone else was asking to see the power supply while in use, I’ll make a small video of these tests. If there is indeed a problem then it’s a good learning experience to understand why :-)

[@steve6375]

@@michellascombe Why not connect a resistive load (e.g. 20R resistor or a filament bulb) in series with a DVM to measure current and see if the PSU meter current reading is accurate?

[@michellascombe]

Yes that’s the idea. I’ll hookup 2 multimeters to measure voltage and current and compare. And I have sets of low-ohm power resistors. I used this setup to test each volt/am-meter modules before final assembly.

[@steve6375]

@@michellascombe OK. But you need to put loads on all outputs (or at least the variable one plus one other). Then check you get the correct current readings. Also, check that the current limiter works and cuts off at the same place whether or not a second load is connected to one of the other outputs?

[@michellascombe]

Got it, I started running some tests, I'll make sure I do what you suggest. I appreciate your help, thank you!

[@PandorasBox2]

hi there great work thou i have LED power supply it said 12v 33A i tried to use it for electrolysis however seems it stop working since water+ electrolyte make it so low resistance PSU think it did short and stop working and turn V0/A0... how can i fix this problem?

[@michellascombe]

Hi, thanks for your kind words! For your electrolysis setup, you could add a power resistor in series with your electrolysis, to provide enough voltage drop to keep the power supply from thinking it is a short-circuit. This may be tricky though: the Ohm value and wattage of the resistor needs to be carefully selected and heat dissipation will have to be dealt with. How many Amps maximum is your electrolysis system using? Let's assume it's 20A for example. You could use a 100W 0.1Ω power resistor. The voltage drop would be 0.1Ω * 20A = 2V. The power to dissipate would be 2V * 20A = 40W The power resistor is graded for that, but this will still be a lot of power (=heat) to dissipate. The power resistor will become very hot and will have to be attached to either a dedicated heat-sink or a large steel plate. Furthermore you may want to add a heat transfer pad or tape between the resistor and the heatsink surface to ensure good thermal conductivity. BTW please also make sure all your cables, connectors, everything in your system are graded above the max current you intend to draw.

[@PandorasBox2]

@@michellascombe Thank you for your comprehensive explaining it helped a lot thank you ^_^ 🙏

[@PandorasBox2]

@@michellascombe thank for help i bought the resistor it worked but as you mentioned both Cable & resistor turned super hot i have to buy thicker cable and i guess mount some sorta fan for the resistor thank you again for help 🙂🙏

[@michellascombe]

@@PandorasBox2 You are very welcome! I am glad I could help 🙂

[@inkomyrt7126]

very well assembled, impeccable finish, where did you buy the plastic case, on any website? could you let me know, thanks! Congratulations on the organization, cleaning and finishing of power suplly !!

[@michellascombe]

Thanks! I got the case from Jameco.com 10”x7.5”x3.1” $9.95

[@danielshella9805]

Bisa gk bg buat voltase 48v_80v dc

[@kris54241]

How do I run higher amps? My PSU can put out 49a and my charger needs 25a...

[@michellascombe]

If your PSU can generate 49A (that's a powerful PSU!) then you have enough for your charger... I don't understand the question.

[@kris54241]

@@michellascombe well I was hoping to run variable but I don't see anything that can run that type of current. The charger can only accept a max 30A at 7-27V. I guess I can just use the 12V line, but will the charger automatically lower the amperage?

[@michellascombe]

@@kris54241 Check your PSU specs. At 12V I doubt it can output 49A, it's probably less. Your 12V line may output a max current lower than 30A and in that case you shouldn't have any problem connecting it to your charger.

[@kris54241]

@@michellascombe it is a 600w psu and says 12v @ 49amp on the sticker...is there somewhere else I should look?

[@michellascombe]

@@kris54241 Impressive PSU! You got the right info: 12V, 49A, whoa. That's plenty of power for your charger. It is supposed to only use whatever current it needs, but better safe than sorry, you don't want to fry it... May I have the brand and model of the charger? I can check the specs if you'd like.

[@jaredturner7204]

What is the app you used to design the front panel?

[@michellascombe]

It’s called Front Panel Designer, it’s from frontpanelexpress.com. A free app.

[@ugurylmaz7666]

👏👏👏

[@gaberaltory5888]

welcoming Despite your great efforts, the broadcast speed did not understand anything from your work

[@manikde4482]

Please give the wiring connection diagram.

[@michellascombe]

Hi, there you go: github.com/tinkering-mike/power-supply-using-ATX/blob/main/Power%20Supply%20Schematic.pdf

[@JevaAudio]

Schematics circuit plz..thx

[@michellascombe]

Hi, I made a wiring schematic and added the link to the description. I hope this will do, let me know if you have further questions!

[@JevaAudio]

@@michellascombe thx bro... good job

[@oturanboga6225]

[@Matthew07080]

Are you gonna test ut for us 😃

[@michellascombe]

I tested it several times as I went through the build but you're right, I haven't shown a final test after I finished the assembly... I've been using it all along since then so I know it works :-) What should I do? I cannot amend the video once it's published... Maybe I can show as I use it for miscellaneous projects and make a short video of that.

[@Matthew07080]

@@michellascombe Yess that would be great sir 👍 Good job tho 😁

[@michellascombe]

@@Matthew07080 Thanks!

[@michellascombe]

Hi, check kzbin.info/www/bejne/m2qsiWilatB5pZY for a thorough testing of the power supply. You don't have to watch the whole thing, it's dull, jump around using the chapters. In this video I don't show any use of the supply for other projects, I wanted to run controlled tests, but I thought you might be interested to take a look anyway.

[@abhishekrai260]

plz this drawing provide to me plz???

[@michellascombe]

What drawing? The link to the schematic is in the video description. Let me know if you want something else.

[@abhishekrai260]

I want just like u bro like stencil

[@michellascombe]

I think you are talking about the front panel design, aren’t you? I’m away from home for a while, but I’ll add a link when I come back and will let you know

[@abhishekrai260]

@@michellascombe Thanks my english is week but you understand thanks i am waiting to your return keep safe god blasé you

[@michellascombe]

Hi, I added to the video description links to the layout files.

[@user-ns7qw9hd5y]

costa quanta? ;)

[@michellascombe]

Hello if you go to timestamp 8:42 I show the list of materials. It cost me $68.76 to make. Translated by Google in Italian: Ciao se vai al timestamp 8:42 ti mostro l'elenco dei materiali. Mi è costato $ 68,76 da fare.

[@furiasalvaje3979]

Bah....