Here in this configurationas you see the emitter is connected to a potential of 9V constantly. The base gets a potential of roughly 6-8 V and the collector gets a 27 V potential. So how does the transistor work here provided that 9 V is always there at the emitter and what is the use of the diode there.
March 20, 2019
9.8 turns on the transistor energizing your collector load. diode makes sure bias voltage goes thru the bpt instead of battery.
March 30, 2019
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