Build your own variable pocket Power Supply

[@KarldorisLambley]

i just knocked a bench supply up using a panel module, a transformer i found in an old stereo, with a centre tapped 24v output, a full wave rectifier i made from diodes i found in a different stereo, and a lm317t and a lm338t and a switch. this video's bit with the 2 pots was so helpful. in general i couldn't have done it without your videos, especially the capacitor and diodes ones were very helpful. cheers

[@elewizard]

Good job man, glad it was helpful, cheers 🥂

[@moeburn]

Wow this channel is perfect for me! The skill level is exactly at my level as an electronics hobbyist - you skip the things I already know, and explain the things I don't know. And most importantly, you show the hardest part - getting it to fit inside a project box. And you show every second of it, sped up just the right amount. I love making electronics projects but I always get daunted at the final step of getting it to fit in a small box and look nice, I find that the hardest part, because it requires arts and crafts skills, not electronics skills. As for a portable battery power supply, if you do decide to do it with lithium ion batteries, make sure to discuss battery safety! I have read many reports of people in the remote control car and quadcopter drone hobby communities and their home made battery packs exploding or catching fire, usually because of incorrect charging settings.

[@elewizard]

Awesome, I am really glad you liked this video. Yes, of course, I will discuss battery settings and battery safety as well as other parts.

[@muanlish]

Excellent video. 2 requests: 1) You should make battery powered one. 2) You should make a variable power supply powered by 220/110v AC supply in. Please consider these. Thanks

[@elewizard]

Thanks for the idea! Will do

[@JackSnary]

I would be interested in seeing the battery version of this project. Thank you for producing these videos, I find them very interesting.

[@elewizard]

Thank you! I will make it 😉

[@chrisreynolds6331]

I built something very similar during the pandemic! It's so useful that I find myself using it every day. I used the step up/down buck converter (the one with the blue LCD) and changed the potentiometers as you did. I fitted 2 18650 lithium cells in series to power it so it's truly pocket

[@elewizard]

Good job 👍

[@laptopDoctorKZN]

Wow. Amazing. So can I make 5 of them and use 1 19v input 5 amp. Then have 1. 0.8v @1 amp 2. 0.6v @ 1 amp 3.1.25v @ 2amp 4. 3v @5 amp 5v @5 amp. Also is there a current limit that can be added

[@GoingUpNorth]

Great video, really good idea for a power supply project! Definitely make the battery powered version.

[@elewizard]

Thanks! Will do!

[@brianwood5220]

I too would be very interested in seeing how to make a battery version. (Maybe a rechargeable battery version). Thanks for sharing.

[@elewizard]

Coming in next months 😉

[@user-mr3mf8lo7y]

The first lesson I learned from a professional of 50+ years experienced: 99% of problems caused by improper power supplies.

[@elewizard]

Exactly 👍

[@rubenmoss1576]

I really enjoy your videos. Thank you for making them. Practical information that benefit a lot of people. Thank you.

[@elewizard]

You are very welcome! Thanks for watching ❤️

[@gkdresden]

For the use of multiple of these pocket power supplies in one experimental circuit it is important to make sure, that each of these devices has its own mains socket power supply. In this way you are safe that the voltages are really galvanically separated from another in order to make parallel or symmetric power supplies. Otherwise you need isolated dc/dc converter modules in your pocket power supply. I would also recomment to use SEPIC converter modules (they are not much more expensive), because mains socket power supplies are mostly limited to 24 V and dc voltages of 30 V or more are a nice to have option.

[@elewizard]

Thank you for sharing your knowledge and being a part of the community ❤️👍

[@MlokKarel]

I think I have all the components except for the box at home, I'm going to try this right now! And I'll 3d print the box in the meantime 😊

[@elewizard]

Wow, it is awesome to use a 3d printer in such projects

[@stalwartekwere2157]

You make electronics interesting 🎉🎉🎉 Kudos 🎉🎉🎉🎉

[@elewizard]

Glad to hear that, cheers

[@abdulwaheedouabihi5903]

could you make a series going through all common electronic components explaining how to use them, and then eventually go on to show how to design circuits with all that knowledge

[@elewizard]

Good suggestion, will do

[@minirccreators3516]

wow this is very informative thanks for sharing

[@elewizard]

You are so welcome

[@jimle22]

I realy enjoyed this build. I woul definately like to see the video of the portable PSU you volunteered to build. Thanks in advance.

[@elewizard]

I am working on it. 👍

[@davidhawley1132]

My first bench power supply was a repurposed PC PSU. Soon followed by a panel-mounted power supply module fed by a 48V AC-DC converter, from a design on YT. Current and voltage limiting to 2 decimal places, excellent display monitoring. The only thing I don't like about it is the membrane keys.

[@elewizard]

Good job 👍

[@mikejones-vd3fg]

Very nice, battery one would be cool, i like the idea of a bench supply not connected to mains.

[@elewizard]

I will make it

[@GeRoNiMo-m4v]

Thanks for the enlightment..appreciate it..waiting for the tutorial on battery portable power supply..thanks again!

[@elewizard]

Coming soon!👍

[@danylipsker]

You are the best Please add some sketches and components description in the general explanation so it will be easy to follow you

[@elewizard]

Thank you very much. OK next time

[@darrenbird2526]

Great project!; Thankyou

[@elewizard]

Glad you like it!

[@stephenmatson3239]

This is awsome!!! Just what i was looking for!!!! please forgive my stupid question, what supplies power to the power supply? I just subscribed to your channel!!! Thanks for sharing your experience and knowledge.

[@elewizard]

Thanks for the sub, welcome to our community. You can use a DC 30V adapter to power the circuit up👍

[@manohar3787]

i have something like this for my projects and yes having a small portable PS is a boon for prototyping. Mine is a battery powered one and yes I want to see how you would design it.

[@elewizard]

Comming in next months 👍

[@wackojacko1997]

This was really cool. I saw you using the pocket-size power supply in another video and wondered where it came from. Now I see you built it. I probably need to watch it again (and again?) to catch everything I missed the first time. I'm curious to know how effective it is and what the limitations of it are (how would it compare to a professional power supply within the range limitations of the homemade version?). Really neat. I like this very much. Thank you.

[@elewizard]

This is a switching mode power supply while professional bench lab power supplies are linear. And also bench lab power supplies have ability to restrict current on output while this power supply is not able to do that. I'm am planning to make a video about battery powered pocket sized power supply. Wait for that 😉

[@J-K-AG]

Battery powered portable version will be amazing

[@elewizard]

Yeah, that my plan

[@gkdresden]

A battery operated pocket power supply is considerably more complex. You have to integrate the batteries. You have to use a SEPIC switching regulator to get also voltages higher than the battery voltage. A regulated current limit should be implemented to avoid damage of the batteries. And you need also an integrated charging module or a battery managment cycle to avoid undercharged operation.

[@elewizard]

Yes, exactly👍

[@Friendroid]

I have built one of these following Electronoobs tutorial here on KZbin. Those Voltmeter/Ammeter give an incorrect current reading even if you try to calibrate them (some are worse than others). This is an ok solution but I still use a multimeter to double check voltage and current before I connect a load.

[@elewizard]

You do the best. These modules are very low quality.

[@MrRufus302]

Sir, I loved the video, but I have one question - as one who knows little to nothing about electronics: how are you powering the the power supply? Surely, not from AC mains supply? If I can ask another question: is it possible o make a battery-operated power supply? I have an oscilloscope that requires D.C. input, but am unable to source a suitable power supply, or battery; your project would be most useful were it battery-operated.

[@Zulfiqar268]

Good job 👍👍

[@elewizard]

Many many thanks

[@allilatif1600]

Hello great project, I am trying to build my own and cant seem to find those connectors at 9:36 what are they formally called ?

[@elewizard]

They are panel mount banana connectors 🍌🍌🍌🍌🍌🍌🍌🍌

[@DJ-tn7vj]

Wish I had saw your video before I bought one

[@elewizard]

Wait for my handmade battery powered power supply. The video is comming soon

[@mdpatel.404]

Sir i have a 12v smps powerunit so i am using xl6009 to up the voltage and lm2695 to fine tune it .But the it just ork for somtimes and then it fries itself . What should i do

[@mmg.mousavi5613]

سلام مهندس عالی بود. خوشحالم که یک چنل انگلیسی هم زدید. ادامه بدید عالیه🥰❤❤

[@elewizard]

Thank you dude, welcome here ❤️

[@MostlyPosative-nj5ex]

The dual potentiometer wiring diagram you drew on paper didn’t match the diagram you drew on the photo. Was it backwards?

[@elewizard]

There is no significant difference! Both of them will work fine but maybe they differ in which direction they increase the voltage

[@arp_catchall]

Thanks. Please make one for lifepo4 battery.

[@elewizard]

More videos is comming

[@RexxSchneider]

If you're going to make a battery-powered portable version, you probably don't want to use a simple buck converter because that can only supply a regulated voltage less than the input voltage, and there's a practical limit on how many 18650s you can carry around and still call it "portable". Using a cheap buck/boost module would allow perhaps 4 batteries and still let you deliver up to around 30V regulated at a couple of amps for around half an hour. Finally, there are cheap buck/boost modules (ZK-4KX type) with built-in displays and adjustable voltage and current limiting for around £8 from Ali Express. Just need case and connectors.

[@elewizard]

Exactly. I have no intent to do business or make something cheaper than what is available on Aliexpress. I will make it for educational purposes, and I think it is worth it.

[@Electronzap]

Had to get a new channel eh? I subscribed again. Good video.

[@elewizard]

Yeah, welcome dude

[@d614gakadoug9]

No power supply has been properly tested until the dynamic performance has been evaluated. A supply can be made to have extremely good DC regulation, yet suffer from very poor dynamic performance, with the voltage undershooting and overshooting as the load is increased and decreased. Worse, sometimes it can get into a state where it is unconditionally unstable and become a power oscillator. One of the ways many relatively crude switchers are made to look good is to compromise dynamic performance in favor of very good DC regulation. (Boost and flyback converters operating in continuous current mode suffer from the "right half plane zero" problem which cannot be fixed with normal frequency compensation methods, requiring that the bandwidth of the regulator be made low.) There are at problems that can come with putting remote potentiometers into the circuit to set the output voltage. One is that noise pickup in the connecting wires can lead to unpredictable behavior. With linear regulators this usually isn't a problem. With switchers it can be a big problem. Another is that, depending on where the pot is in the circuit it can change the frequency compensation of the circuit with the change in its resistance. Another is that, again depending on where it is in the circuit, if there is any "roughness" in the pot and the resistance goes very high momentarily the output voltage of the supply may do the same - the circuit loses the ability to regulate entirely for microseconds to milliseconds. A much better design uses the pot to provide a DC voltage which can be heavily filtered, if necessary, from a stable reference. The voltage from the pot then becomes the voltage reference for the regulator. Many of the simple SMPS ICs make that approach difficult.

[@elewizard]

Thank you for your comment

[@p-niel5328]

Sir, what happened to your old channel? Good thing I found this new channel of yours and immediately subscribed.

[@elewizard]

I had trouble with my MCN and because of that, I have created a new channel. I am going to add old videos along with new videos here.

[@p-niel5328]

@@elewizard Nice Sir. Thank you, I learn a lot in your channel. May the Almighty bless you and your channel.

[@tips1483]

​@@elewizard Hey, new to your channel! Just a warning of a potential issue, I'd imagine reuploading old videos could hurt your channel depending on how youtube's recommendation algorithm works. Additionally I'd double check the TOS of your old MCN before doing so. Note: I'm in no means qualified to say that but just have a hunch so I thought I'd share.

[@elewizard]

@@tips1483 thank you so much for sharing. That was my mistake 👍

[@tips1483]

@@elewizard hey as I said I don’t have the qualifications to speak to that so I’d do your own research, but of course! Best of luck

[@MikeSharrock]

Absolutely you must make a battery powered version

[@elewizard]

Will do!

[@markjamesromeroo8217]

how long this will be use

[@elewizard]

Not much, you can use it for 30min on max current, then you have to let the device to cool down

[@abdollahastani4065]

It's necessary to make it with 220V AC power

[@elewizard]

Great suggestion!

[@shahabvz1643]

nice

[@elewizard]

Thanks

[@zulfiqarhaider-cz9xh]

Sir please share circuit diagram of positive and negative power supply with single input source without transformer thanks sir we appreciate your efforts from Pakistan

[@elewizard]

Did you see the diagram on 9:54 ?

[@sridharkrishnappanavanerth3388]

Please provide circuit diagram.

[@elewizard]

Thank you for your comment. I actually drew the circuit diagram in the video itself. 👍

[@sridharkrishnappanavanerth3388]

@elewizard please give complete circuit diagram

[@zulfiqarhaider-cz9xh]

Sir please I have seen diagram of sed video I requested circuit diagram for example lm7815 and lm7915 both operate with single source without transformer to get positive negative output for my project thanks a lot for replying tnank u

[@elewizard]

I will cover many regulators in upcoming videos.

[@DirkArnez]

i get shocked at 0:07

[@elewizard]

Yeah, it is deceptive 🤪

[@eidodk]

You do not have a bench lab powersupply. You have a switchmode variable power supply. Switch mode power supplies are noisy as hell and can't really be used in a setting where noise is a factor.

[@elewizard]

exactly👌

[@d614gakadoug9]

You _can_ make the output of a switcher quite quiet, but can be difficult and really demands you know what you are doing. Filtering after the point from which feedback for the error amplifier is taken degrades DC regulation because of the resistance of the inductors that are pretty much necessary. Adding extra filtering (like a pi filter) ahead of the point from from which the feedback to the error amplifier is taken can grossly alter the gain-phase characteristics of the circuit and destroy dynamic performance - or turn the whole thing into an unpredictable power oscillator. There are a lot of cheap switchmode "bench supplies" on the market these days. I suspect most are pretty horrible in comparison with well-designed linear supplies. The ARE a lot more efficient. (I have an 80 volt, 15 ampere linearly-regulated bench supply. It is VERY heavy and the fans would suck in any small child passing too close. I actually used it as the input source when I was doing DC to DC switcher design. I hate switchers. I never did any straightforward types - everything was for some special purpose with demanding characteristics. Did I mention that I hate switchers?)

[@mediamisfits3805]

Hey @elewizard I had sent you an email to your channel, did you receive? Regarding creating a case. re 3D PIxel

[@elewizard]

Hi. Yes, I think I've received your email, but I've not checked it 🙃

[@mediamisfits3805]

@@elewizard You're a busy fella educating us all 💯😎