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I've built a few PWM motor controllers for smaller (<20Amp) DC motors. That's not too hard. Building a controller for a car sized several hundred amp application would be difficult and could pose a few safety hazards.
If it were me I'd use the time that would go into building a controller from scratch and make money at some part time job and then buy a used or new commercially available controller.
Building the controller you have in the schematic would probably take a week of your time + parts. Can you make enough money in one week to buy a controller?
Rich
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