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As I am learning I thought I share what I learned for the benefit of the community. I was struggling to know how a npn transistor affects current and voltage in a precise way.
Here are my observations in this simple circuit. Again, as always, please correct me if I made any mistakes.
—LEGEND—
L1 = Loop 1, L2 = Loop 2
v2 = Voltage Supply 2
—OBSERVATIONS—
#1
Current never exceeds base current times beta even when you increase the values of v2 .
#2 voltage drop across base and emitter is roughly.7 volts. The remaining voltage should be dropped at R1. note: However, what I noticed is if resistor is dropped too low, this does not apply ( In a real world circuit, I imagine doing that might burn out your transistor, at the very least. Maybe EC is duplicating a failed transistor?. In either case I would like to know the threshold voltage before it starts to increase dramatically.)
#3 If v2 is at the lowest value possible for max current in L2 (see #1), the voltage drop on a transistor, between collector and emitter should be approximately 300 mV.
Any feedback or if someone has anything to add, please do! Thanks in advance!
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