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![](http://img.uaft2404.org/img/sdela-2019/kompaktnij-reguliruemij-blok-pitaniya.jpg)
An adjustable power supply is the right thing. In general, I think there should be a sufficient number of power supplies. It took the father, for small needs, an adjustable power supply. Having studied their deposits, a number of components were accumulated. I decided to assemble a small-sized PSU.
What will be needed for manufacturing?
A suitable case for my venture, a box from an old modem is applicable. I will not paint windows under the LEDs. I didn’t draw a diagram, it is very simple. The mains supply will lower the mains voltage. The output voltage will be controlled by the Chinese LM2596 DC-DC module.
![](http://img.uaft2404.org/img/sdela-2019/kompaktnij-reguliruemij-blok-pitaniya-2.jpg)
As a basis, I will use a network power supply from a netbook. It is small in size. The output voltage is 19 volts and the maximum current is 1.54 amperes.
![](http://img.uaft2404.org/img/sdela-2019/kompaktnij-reguliruemij-blok-pitaniya-3.jpg)
I will regulate the output voltage using this module. It is quite reliable and cheap.
![](http://img.uaft2404.org/img/sdela-2019/kompaktnij-reguliruemij-blok-pitaniya-4.jpg)
Trimmer resistor of the module, replace with the adjusting one. The resistor is combined with a switch, very convenient. It can be used without a switch, but then you need a separate switch.
![](http://img.uaft2404.org/img/sdela-2019/kompaktnij-reguliruemij-blok-pitaniya-5.jpg)
An indicator of the output voltage is a voltmeter from China. It is compact and fairly accurate.
![](http://img.uaft2404.org/img/sdela-2019/kompaktnij-reguliruemij-blok-pitaniya-6.jpg)
Terminals applied Chinese, such as a "banana". Not fundamentally, you can apply any suitable.
![](http://img.uaft2404.org/img/sdela-2019/kompaktnij-reguliruemij-blok-pitaniya-7.jpg)
The network connector is what it is. Removed from the old flashlight.
![](http://img.uaft2404.org/img/sdela-2019/kompaktnij-reguliruemij-blok-pitaniya-8.jpg)
Small and adjustable DIY power supply
The first to modify the cover. It is necessary to mark the places for the voltmeter and resistor. I glue the masking tape and mark on it.
![](http://img.uaft2404.org/img/sdela-2019/kompaktnij-reguliruemij-blok-pitaniya-9.jpg)
I cut the window under the voltmeter with a sharp knife. I drill a hole with a suitable drill. Trying on. The axis of the resistor was long, cut on an emery. It is also necessary to make a cut under the handle.
![](http://img.uaft2404.org/img/sdela-2019/kompaktnij-reguliruemij-blok-pitaniya-10.jpg)
I install the terminals on the bottom of the case. I also fasten the wires. The wires will go to the adjustment module.
![](http://img.uaft2404.org/img/sdela-2019/kompaktnij-reguliruemij-blok-pitaniya-11.jpg)
I cut the hole on the back of the case. I install the connector for connecting the power cord.
I will seal extra holes later. I’ll cover them with a piece of the printer’s cover.
![](http://img.uaft2404.org/img/sdela-2019/kompaktnij-reguliruemij-blok-pitaniya-12.jpg)
I install the adjustment module and solder wires to it. Also trimmed the resistor. Instead of a soldered resistor, I soldered the wires.
![](http://img.uaft2404.org/img/sdela-2019/kompaktnij-reguliruemij-blok-pitaniya-13.jpg)
I connect the output of the netbook power supply to the adjustment module. I solder the wires to the adjustment resistor. From the network connector, I'm looking for one wire to the power supply. I tear the second one with a resistor switch.
![](http://img.uaft2404.org/img/sdela-2019/kompaktnij-reguliruemij-blok-pitaniya-14.jpg)
To power the voltmeter I will use a stabilizer on TL431. The stabilizer is assembled according to the standard scheme. I chose power at 9 volts. Calculation of resistors made in an online calculator.
![](http://img.uaft2404.org/img/sdela-2019/kompaktnij-reguliruemij-blok-pitaniya-15.jpg)
I fix the boards with PVC plastic segments. I drip the glue and apply the cut. Plastic grabs instantly. It keeps excellent.
![](http://img.uaft2404.org/img/sdela-2019/kompaktnij-reguliruemij-blok-pitaniya-16.jpg)
I fix the stabilizer with glue. It keeps excellent. I feed the stabilizer from the output of the main source of 19 volts.
![](http://img.uaft2404.org/img/sdela-2019/kompaktnij-reguliruemij-blok-pitaniya-17.jpg)
I am soldering the wires from the voltmeter to the stabilizer. Install the adjustment resistor. I put a handle on the resistor. I connect both halves of the case and twist with a screw.
![](http://img.uaft2404.org/img/sdela-2019/kompaktnij-reguliruemij-blok-pitaniya-18.jpg)
BP result
The output voltage is adjustable from 1.24 volts.
![](http://img.uaft2404.org/img/sdela-2019/kompaktnij-reguliruemij-blok-pitaniya-19.jpg)
Up to 18.9 volts.
![](http://img.uaft2404.org/img/sdela-2019/kompaktnij-reguliruemij-blok-pitaniya.jpg)
The output voltage is stable. This unit is perfect for small household needs. At least adjust the fan speed, at least adjust the brightness of the LED strip.
![](http://img.uaft2404.org/img/sdela-2019/kompaktnij-reguliruemij-blok-pitaniya-20.jpg)
Such a small power supply with adjustment turned out. In this case, passive cooling. If you use a closed case, but you need to take care of air ventilation.
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