DIY

Development board power supply

Development board power supply  Development board power supply Power supplies are a must-have for every electric hobbyist. Although lab benchtop power supplies do an excellent job of handling a variety of tasks, they are difficult to carry around. So you need a portable power source. But such devices usually use 12 or 5V rechargeable batteries, and to create a variable power supply, some circuitry is needed that takes up space on the breadboard. In addition, the power supply based on the linear regulator type LM317 cannot provide sufficient current.
In this tutorial, the wizard will show you how to make a portable, compact and efficient DC power supply that can supply 0 to 30V at 1.5A using very few components.
Tools and Materials: -3 digit digital voltmeter; – XL6009 boost module; – SMD 7805 voltage regulator; – 10 kΩ potentiometer; – 10 μF/100 μF electrolytic capacitor; – 10 nF ceramic capacitor; – 2.54 pin header; – SPST power switch; – 5 mm LED + resistor;
-DC power connector; -Adapter 12V 2.5A;
-Wires;
-Glossy A4 sheet;
-Copper-coated board; -Ferric chloride;
-Marker;
-Laser printer;
-Iron;
-Paint tape;
-Computer with software;
-Acetone;
 Power supply for breadboard Development board power supply  Power supply for development board Step one: schematic
Since most circuits use 5V, the master decided to make a constant 5V rail that will also power the voltmeter. The second bus will be AC ​​voltage and will be regulated by the XL6009 converter. To power such a module, you need from 3V to 24V and you can get 1.5V-30V at the output.
Power supply for development board Step two: board design
The wizard uses Eagle CAD to convert the schematic to a printed circuit board. Since the PCB file will later be used to create the power supply enclosure, it adds 3D models of all components using the Eagle CAD managed library function.
Development board power supply Power supply for the breadboard The Fusion Sync function available in Eagle CAD allows you to directly export a 3D PCB model to a Fusion 360 project. < br>If the user does not have Fusion 360, then Eagle also allows you to export the STEP file of the PCB, to almost all 3D modeling programs.
 Power supply for development board Power supply for breadboard Power supply for the breadboard Any service such as JLCPCB, PCB Way or OSH Park can be used to make a printed circuit board. The file can be downloaded here.
The master decided to make the board himself. You need to print a sketch of the board on a sheet of glossy paper.
 Power supply for breadboard Power supply for breadboard Step three: making a board
First you need to print a sketch and outline the outline of the future board from the sketch. Then cut it out. It is advisable to round the corners for a better design.
Then you need to gently sand the copper layer with fine sandpaper. The goal is to remove the oxidized top layer of copper.
Power supply for breadboard Power supply for breadboard Power supply for breadboard Power supply for breadboard Power supply for breadboard Power supply for breadboard Now let's move on to transferring the toner to the board surface.
Paper for printing the board sketch must be glossy, you can even use any old magazine.
The sketch is placed on the board with the front side to the copper layer and fixed with masking tape. Then it needs to be heated with a hot iron for about 10-15 minutes. When heated, the toner will “stick” to the board.
Then we put the board in water and soak it. The paper needs to get wet. Then carefully remove the rest of the paper.
Power supply for the development board Development board power supply  Power supply for development board Development board power supply  Power supply for development board Sometimes, when making boards in this way, some of the toner is scraped off along with the paper. The problem can be eliminated by drawing the damaged parts of the circuit with a marker.
 Power supply for breadboard Power supply for the breadboard Now everything is ready to etching the board.
We make a solution of ferric chloride and place the board in the solution. Shake the container periodically. After the copper is etched away, rinse the board in water and remove the toner and marker from the tracks using acetone.
Drill the necessary holes in the board.
Power supply for breadboard Power supply for breadboard Power supply for breadboard Power supply for the breadboard Step four: the case
The master has printed the case on a 3D printer. A potentiometer knob was also printed.
Print files can be downloaded below.
BBPS_cover.stlpot_knob_2.stlCover v15.step
 Power supply for breadboard Step five: installation
The multi-turn potentiometer on XL6009 is very small and it will be difficult for them to adjust the voltage. The master solders it and solders the connector in its place. Solder the second part of the connection to the full-size potentiometer, on the wires.
Power supply for breadboard boards Power supply for breadboard Power supply for the breadboard The circuit is designed in such a way that the electrolytic capacitor is under the XL6009 module. So you need to raise the module. The wizard does this with pin headers.
Development board power supply  Power supply for development board Power supply for breadboard Power supply for breadboard Since this is a single sided PCB, soldering the headers so that they protrude from the other side is a bit tricky. You need to press on them and pull them out from the other side with pliers (the length of the pin available for insertion into the breadboard should be sufficient). Then you need to solder them.
Next, solder the wires for the switch and connectors.
 Power supply for the breadboard Development board power supply  Power supply for breadboard Development board power supply  Power supply for the breadboard Development board power supply Step six: assembly
After all the components have been soldered, it's time to assemble the device.
Power supply for breadboard For mounting a voltmeter you need M1.5 screws. We simply put the voltmeter in the groove and fix it with screws. You can glue it with hot glue.
Then we solder the voltmeter wires to the board. Black – ground, red – 5 V, yellow – for voltage measurement.
Install the potentiometer.
Power supply for breadboard Power supply for breadboard Power supply for breadboard Power supply for breadboard  Power supply for breadboard Power supply for development board Install and connect the connectors.
Power supply for breadboard Power supply for breadboard  Power supply for breadboard Development board power supply Now, when everything inside is mounted and connected, close the case and fix it with screws.
When closing case, be sure to pull out the switch wires as the switch will be soldered from the outside and then installed.
Prototype board power supply  Power supply for development board Development board power supply  Power supply for development board The last thing to do is set the switch and potentiometer knob.
Power supply for the breadboard  Power supply for breadboard Development board power supply  Power supply for development board Everything is ready, we install the device on the breadboard, connect the adapter and you can check the performance of some circuits.
You can also use the device without a breadboard, using banana connectors as an output. If necessary, you can connect a lithium polymer battery or other power sources to it.
Power supply for the breadboard Power supply for breadboard The whole process of assembling such a device can be viewed on the video.

Source:

usamodelkina.ru

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