I have a Milwaukee 12v variable speed tool with a bad control board. Rather than replace the board, I'm planning to just use a switch for single (full) speed. But the switches that I have & will fit are AC only. So, I'm thinking that I'll use the switch to control a MOSFET that will do the heavy lifting. I just want to make sure that I'm not missing anything.
The plan: + ______________ | | | Load | | |__/.____| | | 1k | | | - ________|_____|
The MOSFET is IRF3205 (Rdson of 8 mohm)
I don't think that I need a switch-gate resistor, or do I?