12V to 9V DC Converter


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 but highly recommended. You
can replace Q1 for a more robust type to get more output amps depending
on your requirements. Simple circuit to power your 9 volt cassette
recorder and other stuff.

Parts List:
R1 = 560 ohm
C1 = 1000uF/40V, Electrolytic
C2 = 10uF/25V, Electrolytic
C3 = 330nF, Ceramic
Z1 = 9.1V, 1watt zener
Q1 = ECG184, NTE184


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