Make a 12Volt 10Amp, 20Amp, 30Amp, 40Amp variable transformerless electronic SMPS power supply

How to make a 12v 10Amp to 40Amp (ie 10A, 20A, 30A, 40A) transformerless electronic power supply SMPS based at home at very cheap price and compact.

By: Alok kumar

Today we are going to make a 12volt 5volt 10Amp, 20Amp, 30Amp & 40Amp all in one transformerless electronic power supply which is SMPS (switched mode power supply) which can output tremendous amounts of power in a small form factor. They have overload protection as well built right in, and even a 500W model can be made at reasonably priced with high efficiency. The voltage is incredibly stable. Giving nice, clean DC current even at high loads. 

For making this such amazing circuit you don't need to be from electrical background or either too many tools as weel even you don't have to invest huge money or you don't need to be very smart one.

Today we are going to simply convert a personal computer power supply to a highly stable , efficient, compact and beautiful electronic transformerless power supply SMPS based.

Actually we can buy a computers power supply at very cheap price or even use a old computer power supply ( you might have one in your backyard.) for this project.

Why we are converting a Computer's power supply to a normal general purpose transformerless electronic power supply because
for the same power supply from market you have to pay a 10 times more than the budget we are going to make and also the high wattage power supply you got from market may dont have overload protection and such high efficiency. Thats why we are making it because it saves our huge money as well we got variousbenifits like stable & clean DC, overload protection, high efficiency.

So lets get start this project:

All you need is:

1. Needle-nose pliers  computers "ATX Power Supply" or any power supply used in PC. 
   
   
2. 
   
3. Soldering iron 
   3 x "Banana Jack" Insulated Binding Post sets 
   
   
4. 1 x bag of "#6" Ring Tongue Terminals (16-14 gauge) 
                                                                                       
5. Rubber feet 
   
   
6. Small bit of heat shrink. 
   
   
7. Screwdriver 
   
   
8. Wire strippers

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Step 1:

First of all you need to get one  of this compuer's power supply for this project to make a 12volt and 10,20,30Amp...

We shoud first consider safety because project deals with high power capacitors. so forst unplug the Power supply from pc and mains leave it for 2 days to discharge and always put insulating gloves while doing this project.

  

Step 2:

Open up the ATX power supply or any you have to open the power supply it will look like below circuit diahram

opened power supply

Now here come the tiring or daunting task of shorting or identifying the wire from hundreds of different colored wire. Here the only color we care about is BLACK, RED, YELLOW, GREEN. Any other colored wire are not of our use so you can leave it or totally cut those off the supply.

Here the colour we care about represents:

YELLOW = 12 volts
RED = 5 Volts
ORANGE = 3.3 Volts
BLACK = Common Ground.

or you can simply check via a multimeter but be careful.

Step 3:

Now you are done. The only thing you have to do sort all same colour wire and group them together and connect them all. We have to connect all same colored wire together to harness the full amperage and wattage from this supply. Now the wire will look like this figure

Now technically you are done Yello and black wire will give you around 12volt 20Amp, red and black will give you 5volt and 32Amp if you need more amperage just buy a computer power supply of high wattage mine was 240watt (approx.)

Now what you can do is to make it beautiful and compact.

Step 4:

Now make a 4 hole as shown in figure and connect those group of wire according to given in figure and you are done.

enjou your 12v 20 amp, 5v 32amp etc...or more it will depend upon the wattage of power supply

Step 5:

Drill 4 holes like given in figure.

connect group of wires to those pins or any pins you have. But keep caution that these wire don't short with each other

Final transformerless electronic power supply SMPS based compact shoud look like this

Enjoy above beautiful circuit. For any querry please ask them in comment section.

Thank You for reading this post.