This arduino based little digital tachometer was originally created for counting the speed of turntables and fidget simple stir plate t k.
Pwm motor speed control circuit diagram.
Adjusting the 50k potentiometer used in the circuit can control the speed of the motor.
The maximum output of the 555 ic is 200ma due to which we have used a bd135 transistor to drive higher current load of upto 1a.
The moment pin 6 triggers pin 3 and pin 7 reverts to logic low.
The simplest method to provide a variable power supply is by providing a variable series resistance between the motor and the supply and this is common in ac motor since the series resistance can be replaced by a series inductance that doesn t.
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The speed of an electric motor is controlled by controlling the power source of the motor.
A simple pwm motor speed control circuit with diagram and schematic for low power dc motors.