In the past i tried wit NE555 and other circuits but the results were every time in shorted mosfet`s and not stoppable GO KART (not very good thing when you do not have a big red kill switch).
In in the following i will present my DC Motor speed controller capable of adjusting speed (PWM) form 0 – 100% and the frequency form ~ 400Hz to 3kHz, based on LM339 comparator.
The power supply is from 14-30volts, expandable to practical any value with little modification.
From R15 VR 10k you can adjust the speed from 0 -100%
From R14 VR 100k you can adjust the frequency.
If the jumper JP1 is shorted you can adjust the PWM frequency from 400Hz to 3kHz. If jumper is open Freq is fixed at 100Hz.
The circuit is designed in Eagle cad 6.2

In in the following i will present my DC Motor speed controller capable of adjusting speed (PWM) form 0 – 100% and the frequency form ~ 400Hz to 3kHz, based on LM339 comparator.
The power supply is from 14-30volts, expandable to practical any value with little modification.
From R15 VR 10k you can adjust the speed from 0 -100%
From R14 VR 100k you can adjust the frequency.
If the jumper JP1 is shorted you can adjust the PWM frequency from 400Hz to 3kHz. If jumper is open Freq is fixed at 100Hz.
The circuit is designed in Eagle cad 6.2

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