This simple power or speed control for DC Motors uses a Power MOSFET as driver stage and a 4093 IC as oscillator. The maximum current in the load depends only of the MOSFET used in the driver stage. This transistor, in a practical project, must be mounted on a heatsink. C1 and C2 can be changed to achieve the best performance. The motor can be powered from a different supply, above 15 V that is the limit for the oscillator. Figure bellow shows the simulation.
The waveshape of the voltage applied to the motor is dispayed as Bellow in the virtual oscilloscope of the MultiSIM.
To download the simulation files and Netlist - click here (ni0009.zip)
