Anon11/13/25, 22:45No.2957414
>what part made you conclude that?
Your arduino connects to the gate of transistor that is meant to pull the gate of another higher power transistor low, but it cant do this because it is connected to the source of the power transistor.>Im using N-FETs, not NPN BJTs
Replacing NPNs with N-Channel MOSFETs makes no fundamental difference, but you have completely changed the circuit topology.>not sure what pull down transistor means but the A09T is at source and acts as a lowside switch providing ground connection to source which completes the gate to source circuit and raises the Vgs to switch the IRLR7843PBF on.
It is infinitely easier to control a mosfet using the gate, rather than fucking around with the source voltage. If you are concerned about miniaturisation, look at the original schematic. Each switch was only 4 components. IIRC guy's main issues were seemingly based around software and timing/control, the schematic seems to be the easy part here.>chatgpt stuff
ChatGPT is designed to agree with whatever you say to give you a dopamine hit so you use it instead of other AI websites. It can be correct sometimes, but I would take whatever it says with a mountain of salt.>TO-251 is larger
Yes, but it is much easier to find/mount to a proper heatsink. If you still want to use copper braid, heat shrink will work better on a long drain pin rather than around the drain of a TO-252 package which is the size of the transistor (heat shrink might not work well with such a flat, rectangular shape, at that point, wrapping the transistor in Kapton tape for insulation and durability would work much better)>P Channels for current sourcing
You used AI slop, so I would just say as a learning exercise go ask the AI why P-channel fets are commonly used in current sourcing, and why N-channel fets are commonly used in current sinking. Ofc you don't need to use P-channel fets, its just a suggestion.