» Electronics » Power supplies »Alteration of a computer PSU to fit your needs

Alteration of the computer PSU to your needs

Electronics / Power supplies
Added 10 comments

There was a need for a power supply for operation. Need fixed voltage. Basically, 12 and 5 volts are needed. Immediately make a reservation, we will mark at work later.

So here. The Internet is full of options, but settled on its version as always. I have not seen such an option anywhere, so I will contribute to this category of alterations. And I will redo the restored computer power supply.

For homemade we will need:
- computer power supply;
- fuse holders;
- terminals;
- switch;
- plastic sheet;
- instruments.

About accessories.
I will redo the recently restored 350W computer power supply. Since I need voltages of 5 and 12V, with a current of about 5 A, this unit is more than enough. I will add another powerful 3.3V.



From China ordered holders for "auto"fuses. They come with protective caps. The caps will not come in handy, at least to me.



I ordered terminals from China. Need a different color.



In the role of a network switch, I have a toggle switch, of which I have a lot of lies. In my version, this is T3.



The front panel is a piece of PVC plastic. Most likely I’ll paint it.



Assembly.
I mark the PVC panel for the holes and the window for the fuse holders.



I drill the marked holes, cut out the window. I also duplicate all the holes and the window on the front of the power supply.



The panel painted black. Screwed fuse holders. I screwed the screws at the corners. Installed a switch and terminals. There is nothing military. In the finished design, everything will be clear.

Left a few wires of the power supply. I started the wires on the fuses and soldered. Thin wires, blue and black, go to the LED. The negative (black) wire was sealed to the tip and screwed to the black terminal.



I soldered the network wires from the power supply board to the toggle switch. From the toggle switch to the network connector. The second ends of the fuse holders connected together. They soldered the wire to the tip and screwed it to the positive terminal. Soldered the wires to the LED through a current limiting resistor of 150 ohms. The LED powered from -5V, and can be powered from standby voltage.



The cover of the power supply was painted from a spray can.



We fasten it and the block is ready. The output voltage is switched by an adjustable fuse.



Such a block turned out. For my purposes it is enough.

Production video, attached:
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4.9
5.1
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Added 10 comments

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10 comments
0
Reply To quote A complaint
blame the author, count the article chatterbox.
I try not to get personal (until I get hurt), as a rule, home-made discussion is discussed, and the author is not blamed, especially since many articles are rewritten! It is a pity that you perceive somehow inadequately healthy, substantiated criticism, which may be useful not only to the author, but also to those who decide to repeat home-made work.
I do not have a high rating, but Commentators, extinguish your ardor!
Is it an order to shut up? smile
0
Reply To quote A complaint
Quote: Nruter
If for your needs and for the rest this is of no interest
The second of the first does not follow. Maybe others also have similar needs.
+2
Reply To quote A complaint
I sit and look at the latest comments.
And again I got the impression that the site is focused on "MEGA" specialists. Everyone considers it his duty to blame the author, to count the article as talkative.
I do not quite understand the topic, but the person did the "home-made", which the site is focused on. He is clearly not selling it, but for himself. And to write an article and share it is wonderful!
I do not have a high rating, but commentators, quench your ardor!
IMHO.
0
Reply To quote A complaint
If this is not of interest for your needs and for the rest, then why publish it at all?
0
Reply To quote A complaint
PSU from the computer fed the car radio for about 5-7 years
The radio does not care, 10-14V will work.
Control has not gone anywhere, everything remains at the same level
Ie absent.
Yes, and indicate the launch of a specific PSU, perhaps not entirely necessary.
But you did it!
You can use the AT power supply and the circuit PS-ON to the ground is not needed.
But you used a specific BP - ATX! We are discussing a specific homemade product, not a hypothetical one! smile
0
Reply To quote A complaint
Quote: Nruter
What are the reasons for using only one voltage at a time?
So after all it is written: "to your needs." So, the author is satisfied with such needs. Therefore, there are no inscriptions on the "face".
Author 0
Reply To quote A complaint
Control has not disappeared, everything remained at the same level.
With a single channel load of 12 volts, the power supply did not change the voltage by 5 volts.
And the installation of resistors on voltage channels of 5 and 3.3 V, loads with a current of 0.5 A. (according to the scheme).
At a previous job, the power supply from the computer fed the car radio for about 5-7 years.
Yes, and indicate the launch of a specific PSU, perhaps not entirely necessary.
You can use the AT power supply and the circuit PS-ON to the ground is not needed.
+1
Reply To quote A complaint
ATX - PSUs cannot start without a PS-ON command! In some PSUs, the control of output voltages + 12V and + 5V is carried out by a voltage divider at the input of the PWM controller, i.e. loading only one channel, we get either a voltage imbalance, or care in defense, depends on the specific circuit! Monitoring output voltage is required! smile
Author 0
Reply To quote A complaint
Ditch what, let me know?
Those. To check the LED lamps, do you need two voltages? 5 volts made just in case, not to mention 3.3 volts.
Have you tried to pull out the fuse in the public domain? Rearranging is very convenient.
Or only in the car, where is the confined space? And what prevents you from using a clothespin, if you need it?
But I missed the launch of the block.
It works perfectly for idle, and does it make sense to use it for idle?
+1
Reply To quote A complaint
This is a story about how you can practically ditch a good idea in the bud.
What are the reasons for using only one voltage at a time? And if you need to immediately, and 12, and 5? I do not think the terminals are in short supply or very expensive. Switching the output voltages by moving the fuses looks a bit like masochism, especially if there is no clothespin key on hand.
Not a word has been said about the operation of the unit without load and about its launch as a whole. Or is it a separate issue?

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