Hello! I know that the base of a transistor must have a resistor connected to it. The problem is that I don't know what resistor to use! I've seen examples using 1k, 10k and 220 ohm resistors. How can I determine what resistor to use for the base? Thanks!

Transistor Base Resistor Choices?

system May 13, 2012, 9:03pm 7

you have to pick the the from data sheet.

What?
Is there a way (formula, rule of thumb, etc.) to estimate the required base current, knowing the collector current?

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