Speed ​​Control of DC Motor PWM Circuit Diagram

Speed ​​Control of DC Motor PWM Circuit Diagram. Often, people try to control small DC motors with a variable resistor type potentiometer connected to a transistor. This system until works well but it generates heat and thus loses power. This circuit is a simple circuit for modulating the pulse width for controlling the DC motor, it eliminates this problem.

 Speed ​​Control of DC Motor PWM Circuit Diagram

The circuit is capable of controlling the engine speed pulses (PWM), these pulses have a duration variable to change the speed of the motor. The longer the pulses lead, the faster the motor will rotate, and vice versa.

R1 1 Meg 1/4W Resistor
R2 Potentiometer 100K
C1 0.1uF 25V Capacitor Ceramic Disc
C2 0.01uF 25V Capacitor Ceramic Disc
Q1 MOSFET IRF511 or IRF620
U1 4011 CMOS NAND
S1 KEY
M1 Motor

 The resistor R2 adjusts the speed of the oscillator and thus the speed of the motor, the motor can be any DC motor that operates from 6V and having no more power than the maximum current of Q1. The voltage can be increased by connection to a higher voltage to switch instead of 6V which feeds the oscillator.The Q1 will need a heat-sink. If you need to use the IRF620 that supports up to 6A.