When my circuit is active (+5V on the base of the NPN transistor) the NPN transistor closes and I effectively have 12V across Emitter-Base on the PNP transistor. I'm guessing that this is why it stops working as this is way more than the max 5V allowed.Now, I just can't get my head around how I could switch 12V (or even up to 40V) with a PNP transistor that only allows 5V Emitter-Base voltage.Any help would be very much appreciated!Thanks,Chris
I forgot to mention that this button is not a current switch but voltage switch, I mean the current passing through it is very small, so even if MONSFET is not completely closed (10k resistance ? ) drop voltage willbe very small on it.
I would recommend to change all the resistors (R1, R2, R3) to 2.2K and then we have:== IB = (11.3 -0.7)/2.2k = 4.8 mA