Steve here is some schematic clips with relays RC networks and an relay driver
Relay Driver has a FET Q2 , a transistor driver Q3
Most driver circuits don't have the FET, they just go direct to the transistor driver
The transistor is to output more current to the relay coil to energize it faster?
The FET is used for what? and without using the FET it would be the same? so what's the difference