I have a question regarding the circuit below.
I am unsure how to calculate the current flowing through the 1k resistor.
I think it is reasonable assumption that the collector of the PNP BJT must be sitting around (5-0.7) = 4.3V as it's base is tied back round to the collector (and assuming the PNP BJT is fully on).
But what assumption should we make about the voltage on the collector on the NPN BJT? I know it is the same as the voltage dropped across the 1k resistor, but I don't know the current flowing through it to work out the voltage dropped.
Is the current through the 1k resistor simply controlled by the base current on the NPN BJT, where the (base current x beta) gives the current through the 1k resistor?