What you need to build this mini power supply adjust voltage and current
- Tip42c transistor
- Bd139 transistor
- VR 4.7k resistor
- VR 6.8k resistor
- zener diode 15v
- 2K resistor
-1k 2w resistor
- 470 Ohm Resistor
- in5408 diode
- 220v 20v transformer
- 35v 2200uf capacitor
- 4 diode IN4007
- download circuit | http://adf.ly/1oAoKN
