This plain converter using a Zener diode and a transistor into a 9V DC 12V DC battery power to the most 1A. The circuit is very simple to build, and requires just 3 electronic components, resistors, zener diodes and transistors. The 2N3055 transistors, 1N4738A Zener diode before Zener voltage and the same power. 3W, and perhaps wire wound resistor 3R type. Powering a expedient tool to avail yourself of 9V DC.
|Converter with 2N3055 transistors|
The output voltage of the following formula:
Zener voltage Vout = + 0.65V, 0.65V, which is the heart-emitter voltage of transistors