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Custom Atmega328-P (Arduino) Circuit HELP

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danadak

danadak

Joined Mar 10, 2018
4,057
R1 should be >> R2 but low enough to insure leakage x R1 << Vbe.

That allows most UP output current to go into base to saturate the transistor.

General rule of thumb to insure transistor saturates Ib ~= Ic / 10.

Regards, Dana.
 
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