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Simple Regulated 12 Volt Supply Circuit
This circuit above uses a 13 volt zener diode, D2 which provides the
voltage regulation. Aprroximately 0.7 Volts are dropped across the
transistors b-e junction, leaving a higher current 12.3 Volt output
supply. This circuit can supply loads of up to 500 mA. This circuit is
also known as an amplified zener circuit.
