Using a MC14093 CMOS type IC, a quad 2-input NAND Schmitt trigger circuit can be designed a very simple pulse width modulation circuit controller electronic project . This pulse width modulation controller electronic project is very simple and require few external electronic parts . The speed is adjustable from 0-max. Max rpm is 2/3 the supply voltage. Supply voltage that can be used in this project can be between 3 and 18 volt . Pulse Width Modulation Controller Schematic MC14093 CMOS type IC can be directly interchanged with the MC14011 CMOS IC . Input pins 8, 9, 12, and 13, need to be connected to Gnd. or 'V+'. Output pins 10 & 11 are left floating. Maximum current draw, with the components shown, is approximately 220 mA max using a small type motor. P1 potentiometer can be a multi-turn type if your needs are towards specific rpm's. For Q1 transistor can be a IRF513, IRFZ42I IRF620 or IRF511 type . To minimize RFI (Radio Frequency Interference), put a Ferrite Bead on...