In this video I will show you in great detail, how to create your own bench power supply from a old PC power supply
Components:
- Old ATX power supply 520W
- DC-DC Step up Down Converter 5V-30V (XY-SJVA-4) (https://bit.ly/3oZpE8M)
- Mini Led Digital Voltmeter Ammeter DC 100V 10A (https://bit.ly/3p0Tlq5)
- Resistor 10w 10Ω (https://bit.ly/3oZCLH9)
- Switch button with led (https://bit.ly/3p2BPBG)
- 3 Potentiometers (50K + 2K + 1K) (https://bit.ly/34YNidI)
- 3 Knobs (https://bit.ly/36akY7o)
- 8 Banana connectors (https://bit.ly/3leDG3W)
- 2 Dual USB female port (https://bit.ly/32eWsRi)
- Fuse socket (https://bit.ly/38lDvk5)
- 5A fuse (https://bit.ly/3l0ZRLa)
- Self Adhesive Sticker paper for print (https://bit.ly/2HZAg7a)
- Self Adhesive Vinyl Film Label Sticker (https://bit.ly/32hp8cA)
- Heat shrink tube (https://bit.ly/3mVtein)
- Some wires
Diagram
Background image:
3D Printer USB Socket frame
15 Comments
Kent · 5 de November, 2020 at 4:26
Very nicely conceived and well executed. I just did a much simpler and cruder one, but I was planning to add variable voltage in the next round, and I like your solution better than my plan. I would probably swap a USB 3/c for one USB 2 pair, but I didn’t even have USB in my plans, so thanks for that as well!
Rui Gaspar · 5 de November, 2020 at 9:14
Thank you for your words.
If you can please share your project after the improvements 😉
Lorenzo · 23 de November, 2020 at 0:30
Very good job.
I suggest you short DATA+ and DATA- on the USB host connectors you want to be detected as “AC Charger” mode so that devices like phones can expect to be able to draw more than 500mA.
Rui Gaspar · 2 de December, 2020 at 11:20
Thank you for the tip, I will do this!
Aleksandar · 27 de November, 2020 at 18:07
Thank’s for sharing your project. Your idea of two pots in series for coarse/fine tuning of voltage is great! I have few observations regarding your diagram. Ground wire from switch goes directly to GND poles without any connection to ATX power supply. Also ground wire from V/A meter goes directly to USB ports without any connection to ATX power supply. Some dots are missing in diagram… Left USB port’s VCC is connected to ground and GND is connected to -5V on ATX. Since everything works fine in your video, I guess that you made unwanted error while creating diagram. But if someone blindly follows the diagram, the reasults will not be as expected. Consider this as friendly observations and keep up with good work.
Rui Gaspar · 2 de December, 2020 at 11:22
I connected the left port -5V to use the 2A that the power supply already provide
Gratak · 2 de December, 2020 at 11:59
What about that resistor between 5V and ground. I see that it goes directly to 5V banana terminal and to v/a meter. Shouldn’t the 5V line be separate to the banana terminal?
MD MAHBUBUR RAHMAN · 1 de December, 2020 at 7:06
how you manage usb output at 1amp and 2 amp.atx power supply has 5 volt with 16amp.
Rui Gaspar · 2 de December, 2020 at 11:36
5V and 40A on red wire, but -5V and 1A on white and +5V and 2A on purple wire
Please Check: https://www.creativesolutions.pt/wp-content/uploads/2020/12/IMG_20201202_112804-3.jpg
Gratak · 2 de December, 2020 at 10:19
Hi, thank you very much for the design. I had some problems with space in my PSU, so i decided to print a case by my own. I will share it here once i get all the parts from aliexpress so i can assemble it.
Rui Gaspar · 2 de December, 2020 at 11:36
Thank you, I will waiting 😉
John Macedo · 3 de December, 2020 at 22:16
Excellent Project. One of, in not THE, finest Power Supply builds i have seen.
Is it possible to replace the 2K and 1K potentiometers with two 5k or two 1k linear potentiometers?
Keep up the great work.
Best regards
Rui Gaspar · 3 de December, 2020 at 23:13
No it isn’t. You need to use the same potentiometers there are in the DC-DC converter that you will use. I only added a little 2K potentiometer in serie with 50K to allow the fine voltage adjustment.
Thank you!
John Macedo · 20 de December, 2020 at 22:49
Hello again. At the 11:00 mark of the video, did you remove the potentiomenter’s wiper ?
Did you remove the wiper from all of the potentiometers or just one?
Sorry to keep on bugging.
Merry Christmas..
Thanks again.
John Macedo · 10 de February, 2021 at 19:19
Hello again,
I printed out the usb frames. But the measurements in your file are too small.
The final product came out to: 0,100 x 2,103 x 2,103cm. Which is impossible for dual usb female ports.
Did you change anything on the scale size before printing?
Best regards