DIY 240W Bench Power Supply Tutorials 0V to 24V 0 to 10A

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Intro: DIY 240W Bench Power Supply Tutorials 0V to 24V 0 to 10A

Hi Guy.Today i will show you how to DIY 240W Bench Power Supply Tutorials 0V to 24V 0 to 10A with LCD voltage and current meter. This project attach the youtube video and schematic for you can understand what did i do for make it. Thanks you very much

Step 1: Watch This Video From Youtube

I make this video for you can easy understand what did i do for make this, in this video have some Advertising. Hope you like my video.

Step 2: Make the Schematic

This schematic i make from eagle software. The main IC is TL494 or( KA7500). You can download the file PDF of schematic here

Step 3: Make PCB by Upload Gerber File to the JLCPCB.COM

Go to for make PCB online

Only 2$ /10pcs for 2 layer PCB and Big Discount on First order Shipping Upload your gerber files and fill in Shipping Adress then click PAY.

Step 4: Received Your PCB After 2 Day

The PCB look great and so beauty

Step 5: Order the Component

List of part here:

You can buy it from any electrical store.

1 x TL494 ( KA7500)
1 x MUR 860 Diode

2 x 5.1kilo ohm resistor

1x 3.3 kilo ohm resistor

2 x 1 kilo ohm resistor

1 x 3v led

1 x 1000uf/50v capacitor

1 x 51 ohm resistor

1 x 100ohm resistor

3 x 1kilo ohm portentiometer

1 x 10 kilo ohm portentiometer

2 x 0.1 ohm 5w resistor

1 x 222 capacitor

1 x DB140 transistor

1 x MJE13009 transistor

1 x 680 ohm resistor

1 x inductor 300uh 10A

1 x big heat sink

Step 6: Solder PCB

Solder all component to PCB. We have the name on the top PCB. So this very easy

Step 7: Check Again.

Check all component were correct.

Step 8: Finish and Test Then Make the Cover Box

I connect with LCD current and voltage meter link here

The power supply from 24V 9A OLD computer modify from 12 to 24V link here

Thank for watching

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7 Discussions


8 months ago

This looks like nothing more than an advertisement for a PCB manufacturer. The schematic diagram is almost incomprehensible. You haven't indicated the inductor core type and number of turns, the parts list is inaccurate an incomplete, the VI meter isn't specified, and the power supply isn't clearly shown or specified.

I'd like to be constructive by frankly it looks like the only reason this project exists is to promote a PCB vendor. There is no way anyone can replicate this project with the information provided.


3 replies

Reply 8 months ago

Please don't comment on my project, i show everything i know. I need money for my live


Reply 8 months ago

It was already clear from the articles you have posted on Instructables so far that you are not interested in showing anyone how to make something. You are only interested in promoting JLCPCB.

I think your time would be better spent improving the quality of your technical illustration so your schematics make sense, learning some electronics theory so you can explain the circuits you present, and practice your PCB layout so the parts fit correctly and are in the proper location.

It doesn't look like you know enough about what you are doing to present the project in way that someone else can follow along without a lot of confusion and wasted effort. For example:

Specifying "A big heat sink" is in no way useful. A part number or supplier link would have been better.

The converter circuit absolutely depends on the inductor. But you haven't specified a part number or supplier link to obtain the inductor, and you haven't specified the core material, wire gauge, or number of turns if the reader is supposed to build the inductor themselves. Just specifying the inductance is not good enough.

There are three potentiometers attached to the board, but haven't described what each does. So what is the builder supposed to do? Guess?

Your BD140 driver transistor is right up against two 5W power resistors which I assume are the current sense element. At full output power those resistors will be dissipating over 7W. You probably don't want the driver transistor being heated by those resistors.

With the exception of two components on your parts list, there are no tolerance, voltage rating, or dissipation ratings on any of the resistors and capacitors in your parts list. Specifying only the resistance value isn't sufficient.

There are a lot more issues with this project. I could go on. But...

Instead of addressing my previous comments, your public response is "go away". That speaks volumes to potential customers that your goal is not to educate, or even attempt to deliver a useful product. You are only in it for the money.


Question 8 months ago

where do i find the gerber file to upload to the pcb factory
i realy would like to do this project

1 more answer

Answer 8 months ago

Don't use that pcb... this instructable is clearly just an advertisement for their company. Instead use step down buck converters, an lcd multimeter module, and a computer power supply. Some other materials like a case, plugs, potientiometers, ect will be necessary but that is all super simple