12V to 3V convertor

12V to 3V convertor

This is an simple and cheap circuit to convert voltage from 12V to 3V.In fact this is a basic regulator circuit.The output voltage determined by

Vout = Vzener - Vbe

When
Vzener is zener voltage output.
Vbe is saturate voltage when transistor on (about 0.6V)

Fig 1. 12V to 3V convertor

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Elenco 9440 Breadboard With JW-350 Jumper Wire Set
Extech EX330 Mini Multimeter with Built In Thermometer
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2SC1061
Data sheet for 2SC1061 3A/50V power transistor.

3.6V zener diode
Data sheet for 1N38xx series zener diode