Hi Kas,
Thank you for your interest on my channel.
In video #7, I use 4N25 opto-coupler along with IRF840 without any driver between arduino & 4N25 but also not fet driver between 4N25 & IRF840. It is a cheap solution but depending on your application can be a problem where you'll not go high in frequency control or low duty cycle of plasma resonance due to intermodulation.
This is why I worked with my team partners Dan & Raivo to build one of the fastest ZPE driver I know of based on IL610 + MCP1403 + IRF540 or IRF840 that you see runing on video #8. This saves the component count on PCB and makes sure to have extreme pwoer PWM signals driving the coils & transformers which is required to pump ZPE energy. You can also replace MCP1403 by TC4423 or MC34151 which are excellent but a bit slower.
As for logic level mosfet, it will not work & might be even worse than 4N25 + IRF840 due to bandwith consideration.
Now, if your intent is to just make plasma globe for fun, no problem use logic level fet along with isolator but if your intent is to make Zero Point Energy devices, it is based on special oscillator requiring sharp pulsed signals hence no choice than to invest into serious isol-fet drivers.
Amicalement