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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
2SC1061
Data sheet for 2SC1061 3A/50V power transistor.
3.6V zener diode
Data sheet for 1N38xx series zener diode
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