Simple Voltage Booster Circuit Diagram :
- The component values are not very specific here.We can use any NPN power transistors like D1616,2N 3055,C2236,SL 100 etc for Q1 and Q2.
- The transformer can be any center tapped 5A transformer with a 7:1 winding ratio.
- The diodes can be 1N 914 ones.
- In fact you can easily assemble the circuit from the components in your electronics junk box.
- By experimenting on the tranformer winding you can get different boost ratios.
- For high current (around 5A) games use 2N 3055 transistor or more powerful Darlington pairs for Q1 and Q2.
Source : circuitstoday.com/voltage-booster-circuit