Can someone please explain to me what the meaning of the threshold voltage on the VNPxxN07 transistors and if it is different from the threshold voltage mentioned, what input (gate or drain) voltage is necessary for the protection circuits to be acti...

Hello!  I am interested in building the design in the file below but rather than using the LM395 transistors, since they are difficult to acquire, I was wondering if I could substitute some VNP5N07s or similar transistors for the LM395s as a more mod...