This isn't homework, this is for a project I'm working on. The circuit is a darlington array, but it includes a base resistor already for protection. I need to calculate i1 (seen in the circuit diagram) to see what value of current results when I apply 5V to see if an additional resistor is needed. The only way I can think to do it, as this is what I do when calculating a base resistor for a single transistor, is to do a KVL from the base -> emitter. Can someone just check to make sure my equations are correct? I can solve the simultaneous equations no problem, I just want to make sure my logic is correct.
i1 loop: 5-(2.7k)(i1) - 7.2k(i1-i3) - 3k(i1 - i2) = 0
i2 loop: -0.7 - 7.2k(i3 - i1) = 0
i3 loop: -0.7 - 3k(i2 - i1) = 0
i1 loop: 5-(2.7k)(i1) - 7.2k(i1-i3) - 3k(i1 - i2) = 0
i2 loop: -0.7 - 7.2k(i3 - i1) = 0
i3 loop: -0.7 - 3k(i2 - i1) = 0
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