Well, you can make a 12 volt power supply very cheaply and easily!
I needed a 12 volt power supply for my project, the SSTC (Solid State Tesla Coil), and also made this instructable because it might be use full to someone...
Step 1: Things that you will need...
- Piece of veroboard
- 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. (I found a 16v 200mA transformer in a broken alarm clock.)
- 1000uF - 4700uF capacitor
- 1uF capacitor
- Two 100nF capacitors
- Jumper wires (I used some plain wire as jumper wires)
- Heatsink (optional)