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A voltage regulator circuit needed

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RollingEEE

RollingEEE

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7803 voltage regulator

Hi, I need a design of a voltage regulator that gives 3V / 1.5V output, and 500mA maximum load current. I tried to look for a 7803 IC, but it is not available (atleast not in my country) I want to make this regulator with transistors and commonly available ICs. Can any one help me?
 

voltaje regulator 7803

Sometimes, you'd better give more detailed spec or just have a second source spec posted here so that everyone knows exactly what you need
 

7803 regulator

I want to run an AVR butterfly without battery
 

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