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12V to 9V Converter
Copyright © 1993 - Tony van Roon
Actually this circuit working as power supply regulator for 9V defined by zener diode Z1 9.1V trough the Q1 dropped by Vbe 0.7V so the output is 9.1V-0.7V = 8.4V.To get a more precise output voltage, replace zener diode Z1 with 10V and R1 with a 1Kilo ohm potentiometer. A Coolrib for Q1 is optional. Simple circuit to power your 9 volt cassette recorder and other stuff.
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