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12V to 3V Convertor

2016-01-17 17:41  
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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
Vzeneris zener voltage output.
Vbeis saturate voltage when transistor on (about 0.6V)

 


Fig 1. 12V to 3V convertor