Here is a part of my schematic.
K pin from LCD is connected to NPN transistor. A pin is connected to Rc and Vcc, 5V.
Base is connected to uController. It is Atmega16. 5V supply.
I am using 2N3904 transistor as it is showed at the picture.
Electrical Characteristics form datasheet:
Vcbo= 60V
Vceo=40V
Vebo=6V
Ic=200mA
So the question is how can i calculate resistance of Rb(R7 on schematics) and Rc?
I found some calculators online and there's always Vi, explained as the input switching voltage or the input trigger voltage. I am not sure what it refers to.
K pin from LCD is connected to NPN transistor. A pin is connected to Rc and Vcc, 5V.
Base is connected to uController. It is Atmega16. 5V supply.
I am using 2N3904 transistor as it is showed at the picture.
Electrical Characteristics form datasheet:
Vcbo= 60V
Vceo=40V
Vebo=6V
Ic=200mA
So the question is how can i calculate resistance of Rb(R7 on schematics) and Rc?
I found some calculators online and there's always Vi, explained as the input switching voltage or the input trigger voltage. I am not sure what it refers to.