Simple Regulated Power Supply

When you collect an electronic home-made product, you need a power supply to test it. There is a wide variety of ready-made solutions on the market. Beautifully decorated, have many features. Also a lot of kit-kits for self-production. I'm not talking about the Chinese with their trading floors. I bought on Aliekspress board modules down-converter, here on it and decided to do. The voltage is regulated, there is enough current. The unit basically has a module from China, as well as the radio components that I had in my workshop (they had been waiting for their time for a long time). It regulates the unit from 1.5 volts to the maximum (it all depends on the rectifier used up to the adjustment board.

Description of the components

I have a 17.9 Volt transformer and a current of 1.7 Ampere. It is installed in the housing, which means you don’t need to pick the last one. The winding is quite thick, I think, and 2 Amps will pull. Instead of a transformer, you can use a pulsed power supply for a laptop,but then you also need a case for the other components.
Simple regulated power supply
The AC rectifier will be a diode bridge, it can be assembled from four diodes. Smooth pulsations will be an electrolytic capacitor, I have 2200 microfarads and a working voltage of 35 volts. Applied used, was available.
Simple Regulated Power Supply
Adjusting the output voltage will be a Chinese module. There are a lot of them on the market. It provides good stabilization and is quite reliable.
Simple regulated power supply
For a comfortable adjustment of the output voltage, I will use a 4.7 kΩ adjustment resistor. The board has 10 kΩ installed, but I have what I put it on. The resistor is still the beginning of the 90s. With this rating, adjustment is ensured smoothly. I also picked up a pen on him, also shaggy.
Simple Regulated Power Supply
The output voltage is indicated by a voltmeter from China. He has three wires. Two wires are powered by a voltmeter (red and black), and the third (blue) is measuring. You can combine red and blue together.Then the voltmeter will be powered by the output voltage of the unit, that is, the display will light up from 4 volts. Agree is not convenient, that's why I'll feed it separately, about this later.
Simple regulated power supply
To power a voltmeter, I will use a domestic 12 volt voltage regulator chip. Thus, I will ensure the operation of the indicator-voltmeter from the minimum. The voltmeter is powered by a red plus and black minus. The measurement is done through the black minus and blue plus the output of the block.
Simple adjustable power supply
I have domestic terminals. They have openings for banana plugs and openings for clamping wires. Similar can be bought in China. I also picked up wires with tips. jpg "style =" max-width: 100%; " alt="Simple adjustable power supply">

Power supply assembly

Everything is going according to a simple drawn outline.
Simple regulated power supply
The diode bridge must be soldered to a transformer. I arched it for a comfortable installation. At the exit of the bridge soldered capacitor.It turned out not to go beyond the overall height.
Simple adjustable power supply
The power supply coil of the voltmeter was screwed to the transformer. In principle, it is not heated, and so it stands in its place and does not bother anyone.
Simple regulated power supply
On the regulator board, a resistor was dropped out and soldered two wiring for an outboard resistor. Also soldered wires to the output terminals.
Simple adjustable power supply
On the case, marking the holes for everything on the front panel. Cut out the holes for the voltmeter and one terminal. The resistor and the second terminal set at the junction box. When assembling the box, everything is fixed by squeezing both halves.
Simple regulated power supply unit
The terminal and voltmeter are installed. Simple adjustable power supply So it turned out to install the second terminal and the adjusting resistor. Turnkey the resistor made a cutout. "style =" max-width: 100%; " alt="Simple adjustable power supply"> Cut the window under the switch.The body is assembled and closed. It remains only to unsolder the switch and the adjustable power supply unit is ready for use.
Simple regulated power supply

Test block

The power supply adjusts the voltage from 1.23 Volts.
Simple Regulated Power Supply
The maximum voltage is 19 Volts.
Simple Regulated Power Supply
Displays a voltmeter fairly accurately. 20-30 millivolts do not consider such a strong deviation.
Simple regulated power supply
I connected a motor. Voltage does not sag. This power supply is simple and does not display the load current. Maybe this is a minus, but this case would not accommodate another ammeter and current adjustment is not provided. So I coped with the task.

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