Introduction: Home Made Power Supply to Be Used in Your Projetcs

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About: Since I was child, one the stuffs that did many times was disassemble all my toys. Actually, I also disassembled the electronic equipments from my parents. The pieces was used to create another toys more fun. …

In this project I built a power supply to be used while we are testing our devices. In order to make the project easier and faster, the "heart" is the step-down XL4016. Below you can check some of benefits to use it step-down power XL4016:


- Wide 5 Volts to 40 Volts Input DC Voltage Range.

- Output adjustable from 1.2 Volts to 35 Volts.

- Output of 9A Current Capability. Use a heat sink if the current is greater than 5A. Also a fan can be added to decrease the temperature.

- The output current can be adjustable. From 0,2A to 9A.

- Power: 300W.

- Efficiency up to 96%.

- Short circuit protection function.

- Size of this module: 65mm x 50mm x 20mm (L x C x A);

Supplies

1 power transformer to reduce voltage - Choose according you need;

2 diodes 6A6 - or other according to the transforme used;

1 on-off key;

1 fuse;

1 potentiometer 10k linear with knob;

1 potentiometer 1k linear with knob;

1 fan for 12 Volts;

1 resistor 510 Ohms x 1/4W;

1 LED;

1 step down XL4016;

1 LM7812 with heat sink;

1 capacitor 100 μf x 25 Volts;

1 capacitor 100 nF;

1 digital meter DC for voltage and current.

Step 1:

I also did a change in XL4016. I welded a potentiometer instead of the original trim-pot to control the voltage. It gives more control, because now it is easy to change using a simple knob. But I added more than one potentiometer in order to give me more precision. It was added in series with the other, but the nominal value of it is lower.

The values are 10k and 1k linear.


I added a fan to keep the temperature of the XL4016 great to work. As the fan works with 12 Volts, it was necessary to add LM7812 to provide it. It is obligatory provide a heat sink to LM7812.

The 12 Volts are also used to switch on a green LED. You must add a resistor in this case. The great value is 510 Ohms.


During the assemble I added a display (meter) to show the voltage and current during the use.


If you work with audio could be a good idea add a new capacitor. The value could be around 2.200 μF. The voltage of operation for this capacitor will change accordingly the power transformer that you gonna use.


In my case, the power transformer that I am using is for 28 Volts x 3A. I can adjust values between 1.2 Volts and 25 Volts.

I used diodes for 6A, in case 6A6. But you must choose according to the current that can be provided by your power transformer.


Last, but important. I have to say that English is not my native language. So, sorry for mistakes that I made along the texts and video.