Blank Stare
Newbie level 6
12v variable speed motor
Hi there.
I am almost a complete newb to electronics, and I hope you will be patient with me, if I ask dumb questions, or offer irrelevant information...
I am building a control box for a salt spreader. The old controller is gone, and I don't want a new factory one, I want one that I can eventually take out of the project box, and mount in the dashboard.
Here are my parameters:
12 VDC up to 40 amp draw when starting the motor.
on/off switch
variable speed dial
variable speed over-ride, for a full speed surge.
50 amp relays (one is controlled by the main power switch, the other is controlled by the surge by-pass switch.
push button breakers, 10amp on the switch side, and 40 on the motor side.
Must be very simple, and cost under 100.00 US
project box is a double-gang electrical box. I will get dimensions when I can find my ruler - LOL!!!
In a nutshell, I have everything designed, and ready to install, when I found out that a rheostat would get too hot. It was suggested that I use a PWM MOSFET, and I think I understand the MOSFET is nothing more than a fancy power relay, but I do not understand how a PWM fits into the schematic?
Hi there.
I am almost a complete newb to electronics, and I hope you will be patient with me, if I ask dumb questions, or offer irrelevant information...
I am building a control box for a salt spreader. The old controller is gone, and I don't want a new factory one, I want one that I can eventually take out of the project box, and mount in the dashboard.
Here are my parameters:
12 VDC up to 40 amp draw when starting the motor.
on/off switch
variable speed dial
variable speed over-ride, for a full speed surge.
50 amp relays (one is controlled by the main power switch, the other is controlled by the surge by-pass switch.
push button breakers, 10amp on the switch side, and 40 on the motor side.
Must be very simple, and cost under 100.00 US
project box is a double-gang electrical box. I will get dimensions when I can find my ruler - LOL!!!
In a nutshell, I have everything designed, and ready to install, when I found out that a rheostat would get too hot. It was suggested that I use a PWM MOSFET, and I think I understand the MOSFET is nothing more than a fancy power relay, but I do not understand how a PWM fits into the schematic?