Illustration of load line for a common emitter bipolar junction transistor amplifier.  Illustrates transistor characteristic curves for several values of base current. Inspired by File:Common emitter load line.PNG but in vector format. Ref Maurice Yunik ":Design of Modern Transistor Circuits", Prentice-Hall 1973, ISBN 0-13-201285-5 figure 4-16 page 69 but simplified for no emitter resistor
Own work
Wtshymanski