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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 powe...

IC Timer 555 has a basic PWM controller with pulse width control feature 0 .. 100% which is controlled using the R1, at the time of controlling the oscillator frequency relatively stabi so it may be used to build the Simple PWM controller. Frequency of Simple PWM controller 555 depending on the value of R1 and C1, values ​​shown R1 and C1 will form the output with a frequency of 170 to 200 Hz. Diode-diode used in the Simple PWM controller With this 555 can use a 1N4148. R2, R3 and C3 form a giver triger circuit beginning at the reset IC 555 for 2 seconds. If you want to use a series of Simple PWM controller 555 with the V + not +12 V, it does not matter to raise tilapia R2 where (V + * R2) / (R2 + R3) is about 2, because it limits the signal level reset is 0.5 .. 1V. If you do not do that, then signal the kickstart to get too close to the limit reset signal reception. PWM controller circuit Q output of 555 on the Simple PWM controller circuit 555 is used for driver PWM pulse, so that t...