Compact regulated power supply 24V 5A

I decided to remake my laboratory power supply. Although it is reliable, it is heavy and takes up a lot of space. There is never enough on the desktop. Planning a reshuffle. I decided to hang a wall shelf and there is plenty of space under it. The idea came quickly, I’m making a wall-mounted laboratory power supply.

Will need

The case will be a box from an old modem. There is plenty of space in it, and I will assemble it in modules.

The power part is a module from China. The output of the module is 24 volts and they promise an impressive current, as for the dimensions of the module.

I will regulate the output voltage using a ready-made module. The module is quite common, there is a lot of information about it, the price is very good.

Instead of trimming resistors, I will install domestic adjustment ones. It’s better, of course, to take wirewound resistors, but I’ll use what I have. You also need to select handles for them.

I have a T3 network switch, I have a ton of them.

The terminals need different colors so as not to be confused when connecting devices.

Voltammeter from China. Has proven itself very well. The dimensions are just right.

Manufacturing a laboratory block from Chinese modules

On the case I make markings for the elements of the front panel. I cut it out. The plastic is quite soft and can be cut with a sharp knife.

I'm trying out space for the modules. I drill holes and install modules. I install the network module on the bushings. The bushings were cut from silicone tube. I immediately connected the output wires from the network module. I took out the wires for the adjusting resistors. There is no point in drawing a diagram, everything is banal and simple. From the network module, the wires go to the control module. The wires go to the terminals through a voltammeter.

I soldered the wires to the resistors. I found pens of different colors. There are 3 wires for the current control resistor and 2 for the voltage.

The network cable was soldered to the toggle switch. From the toggle switch the wires go to the module. A very convenient place was under the toggle switch.

A stabilizer was used to power the voltammeter. The stabilizer on the TL431 has been assembled. You don’t have to install it, but I decided to play it safe. Can also be powered from 24 volts. The stabilizer can be calculated on the Internet.

For smooth adjustment, I installed a constant 27 kOhm resistor in parallel with the adjustment resistor.

I connected the input and output wires to the control module. The stabilizer for the voltammeter was also screwed to the module. The stabilizer was filled with thermal glue.

I'm closing. I turn it on. I connected a car lamp to the output. Stabilization works great.

The laboratory power supply fits perfectly into the workshop. Doesn't take up space. Convenient to use

Links to modules:

Watch the video

come back

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Comments (7)

#1 Guest Yuri Guests 29 July 2019 20:50
5

Is 4A an impressive current? At maximum load, these blocks will become very hot. I did something similar. Pulsations are simply unacceptable for a laboratory worker. Yes, and stabilization is in question. At the end of the video on YouTube, your system’s voltage and current drops, but you cheerfully report that everything is working. Definitely a dislike!
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1. #2 Sergey K Visitors September 22, 2019 08:28
  1
  
  There is discord among laboratory workers!
  Sometimes you just need a stabilized power supply with a given voltage. I once made myself a 24-volt power supply from Ali, only with digital setting of current and voltage, so since then a normal laboratory one has been gathering dust on a shelf, I’m already thinking of selling it cheap.
  
  Answer
#3 Guest Vitaly Guests July 30, 2019 06:29
3

So here, with your own hands, only the body was sawed down, the rest is ready!
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#4 Guest Alexander Guests 30 July 2019 15:15
3

Funny! What with your own hands? Please indicate at least what kind of blocks you used and how they work. I understand the problem, but what happens?
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#5 Guest Victor Guests 31 July 2019 09:11
4

Good idea. Everyone can only blame. I've seen similar ones, just lying around on the table. Not the body for you, not the design.You also need to be able to assemble everything correctly and install it in the case. During the development, I burned a bunch of semiconductors. Ripple can be defeated; the internet is full of ways.
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#6 Guest Alexander Guests 5 August 2019 21:25
3

no one is saying that the idea is bad, you just need to be simpler without loud headlines and do it yourself and explain what you did
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#7 Guest Oleg Guests August 6, 2019 11:59
5

There are already a million of these power supplies from ready-made Chinese units on the network, only the housings differ. No initiative, no imagination. I assembled my own 23 V and 6 A power supply from a pulse power supply from the printer, cut out a little alteration from the common board and it turned out to be an excellent 23 V power supply. Adjustment on the same unit from China, just installed the fan at 12 V and powered it and the indicator (ampervoltmeter) from 7.5 V. I contributed something and got an excellent power supply, charged the car several times, the battery does an excellent job and is great for crafts. As for pulsations, well, whoever deals with precision electronics where you need an ideal laboratory power supply has long had either factory LBPs or transformer ones... (believe me, there are not many such craftsmen) As for repairing TV, low-frequency amplifiers, setting up various electronics, the specified LBP is excellent. All success and please contribute something of your own to the design and it will be much more interesting for all of us to read and watch.
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