Have you ever needed a 12 volt power supply that can supply maximum 1 amp? But trying to buy one from the store is a little too expensive?
Well, you can make a 12 volt power supply very cheaply and easily!
Step 1: Things that you will need…
Things that you will need to make this power supply is…
- Piece of protoboard
- Four 1N4001 diodes
- LM7812 regulator
- Transformer that has an output of 14v – 35v AC with an output current between 100mA to 1A, depending how much power you will need.
- 1000uF – 4700uF capacitor
- 1uF capacitor
- Two 100nF capacitors
- Jumper wires (I used some plain wire as jumper wires)
- Heatsink (optional)
Step 2: And the tools…
Also you will need the tools to make this power supply…
- Soldering iron
- Wire cutters
- Wire strippers
- A thing you can cut protoboard tracks.
- Hot glue (To hold components down and make the power supply physically strong and sturdy.)
- And some other tools that you might find helpful.
Okay, I think that is about it, lets get to work!
Step 3: Schematic and others…
Datasheet for LM78XX
If you are going to pull out about 1 amp from this power supply, you will need a heatsink for the regulator, otherwise it will generate very high temperatures and possibly burn out…
However, if you are just going to pull out a few hundred milliamps (lower than 500mA) from it, you won’t need a heatsink for the regulator, but it may get a little bit warm.
Also, here’s the schematic…
I also add in an LED to make sure the power supply is working. You can add in an LED if you want.
Step 4: Make it!
Make sure you get good solder joints and no solder bridges, otherwise your power supply won’t work!
Step 5: Test it!
After you had built your power supply, test it with your multimeter to make sure they are no solder bridges.
After you tested it, put it in a plastic box or something to protect you from shocks.
But do not operate the power supply like I did, it is very dangerous because of the mains voltage on the transformer, you or somebody will get badly shocked!
My power supply has 11.73v output, not too bad, I don’t need it to be exactly 12v…
Step 6: Done…