ecerfoglio
New Member
I understand that except for the "hfe" part.
Yes, hfe (or beta) is the ciurrent gain of the transistor. for a small signal transistor it should be at least 100 or even 200. (for a power transistor it is less)
And is "Rbase" referring to the base resistor value?
Yes it's the current limiting resistor between the 555's pin 3 and the transistor's base