For those of you who would like to give this a try.
Credit given to the following web link
http://solorb.com/elect/pwm/pwm2/
12V low side PWM Motor/Light Controller
All part can be found at Radio Shack
Parts List
1 - LM324 quad op-amp
1 - IRF510 N channel MOSFET
1 - 1N4004 silicon diode
1 - LED
1 - 0.01uF ceramic disc capacitor, 25V
1 - 0.1uF ceramic disk capacitor, 50V
4 - 100K 1/4W resistor
1 - 47K 1/4W resistor
2 - 3.3K 1/4W resistor
1 - 2.2K 1/4W resistor
1 - 470 ohm 1/4W resistor
1 - 10K linear potentiometer
Additional components
1 - 1.5 Amp, 12V DC fast blow fuse
1 - toggle switch, 5 Amps
Schematic in the video.
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