BaKx (heating principle) inspired desktop vape

[Hippie Dickie]

what is the MOSFET gate voltage from the pwm? i can't tell if it is 3.3v or 4.5v from the description. should be eq or above 4.5v (for the one i use) or the source to drain resistance can skyrocket and burn it out. mine used to get wicked hot before i learned this.

 

[highvaper]

The pwm is connected to the mosfet breakout board which is optically isolated from the pico:

LR7843 MOSFET Control Module - ProtoSupplies

MOSFET module uses the LR7843 N-Channel logic compatible MOSFET with ultra low 3.3mΩ Rds(on) for high current low-side switching applications.

protosupplies.com

From the pico the pwm voltage is 3.3v and higher current/voltage side has 12v (it needs between 6-28v) so think all ok and just my shorted out element was the issue.