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
i need working of it
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