开云体育

PWM controllers are easy to ?build. Get a C.Mos chip 4011 and connect a variable resistor and a diode in series across pins 1 and 3 connect pin 1 to pin 2, connect a capacitor .01 uF from pins 1 and 2 to pin 7. Connect 3 - pins 5&6 then pin 4 - 8&9 then pin 10 -13 &12 the output is pin 11. You then need a H circuit where the motor is connected in the horizontal arm of the H and transistors capable of handling the current of the motor in the four uprights so the one upper one on the left, the motor and the bottom right are in series and the top right in series with bottom left so the motor can be driven forward or reverse.?