1 12V to 9V DC converter using Zener diode and transistor

DC to DC converter using Zener diode and transistor jpg

This simple converter uses a zener diode and a transistor to convert 12V dc from a battery to 9V DC with a maximum current of 1A. The circuit is very easy to construct and requires only 3 electronic parts, the resistor, Zener diode and transistor. The transistors is  TIP41C, zener diode is  1N4738A or any zener with the same voltage drop and power. Resistor  is   3ohm 3W and  preferably wire-wound type. Useful in powering devices that uses 9V dc.

The output voltage is given by the formula :
Vout = Zener voltage + 0.65V , where 0.65V is the base-emitter voltage of the transistor

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