inverting or non-inverting transistor Fet driver?

Other Hardware General Electronics
4

lemming:
I would like to keep the logic intuitive by having the fet output go high when the micros pin goes high.

Are there any pitfalls using the following circuit (I would use 10k for R1)?

Something you just have to get used to.

  1. IRF520 (typo?) is not logic level, so will struggle with 5volt logic (circuit#1 would be better for that one).
  2. Emitter follower drive circuit 'steals' another ~0.65 volt (BE junction) from the gate drive voltage.
    Circuit#2 would be better without the drive transistor (and with a logic level mosfet).
    Leo..