I'm working on a DIY heater controller for filament, using a 12v 100w PTC heater. My wife is limiting my parts orders for now, so I need to make do with what I have. I have relay modules I could use, but I also have a board with some MOSFETs rated at 500v and 5a. Would those MOSFETs be suitable for handling a maximum draw of around 8a for the heater? I understand that the heater will self-regulate as it heats, and I plan to control it in specific temperature ranges.
2 Answers
If your board has two MOSFETs, you could run them in parallel, which might help with the load. But if you're not comfortable with that, sticking to relays is a solid plan for now! You can always upgrade later with solid-state options.
Using MOSFETs rated for only 5a isn't going to work for your 8a draw. They just won't hold up for long under that load.
Got it! I had a feeling voltage ratings might not change that. I’ll stick with my relay modules for now.
Yeah, I think I’ll just keep it simple this time and use the relays I have. Maybe I’ll rethink this setup down the line.