0 12V to 8V 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 8V 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  1N4737A or any zener with the same voltage drop and power. Resistor  is   4ohm 4W and  preferably wire-wound type
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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