Intro: How to Build SMPS Transformer | Home Make 12V 10A Switching Power Supply
With the transformer from old computer PSU. I try to make 12V 10A ( SMPS ) at home. I use SprintLayout for make PCB and iron method for make PCB board. In this video you can see me windings the SMPS transformer
For easy make PCB you can download my gerber file below and upload to JLCPCB.COM for make PCB online
Step 1: Design the PCB
I use SprintLayout one of Rusia electric software for design PCB and print it to calendar paper. I always use calendar paper for print PCB because it cheap and good quality
Step 2: Make a PCB by Iron (press) Method
The first we need to cut the PCB exactly the PCB we print on calendar paper. After that we use the iron press to the PCB about 5 minute at maximum temperature
Step 3: Complete Make PCB
We put the PCB into water about 5 minute. After that we take the paper out and put it to FeCl3 liquid for 15 minute or more...then put to water again and clean it.
Because make the PCB take alot of time so for easy you can make PCB online. I usualy make PCB online by upload the gerber file to JLCPCB.COM for get PCB only 2$ for 10PCB. All file of my project include gerber file below. https://drive.google.com/file/d/1UjW-VHvbHSNWNfw00ue3HTzWt3pBR8py/view
Step 4: Drill PCB and Solder Component
Make the hole for PCB and solder component. I had attach the layout picture you just put the component to exact position.
List of component below. For detail just copy the name and paste to google image search
Brigde diode RS507
Mosfet 20N60 x2
Resistor 27ohm X2
Choke and transformer heatsink we can take from old computer PSU
The Transfomer we need windings modify.
Step 5: Take Out the Old Wire From Transformer and Rewindings
Put the transformer to hot water in 5 minute. after that we can get the ferrite core. windings the transformer we use 0.4mm wire with primary 40T and secondary 5T for get 12V output. At the output with big current we use 6 wire together. Each layer must to use insulation tape
Step 6: Solder Transformer and First Test
Solder the transformer and test the circuit. In the first test we must connect with 60w/220v light bulb before plug to 220V. If the circuit fail the light bulb will on and we safety