Change of DC motor direction is attained using the DPDT switch S1 which on application just toggles the polarity applied to the motor. Higher the duty cycle the average voltage across motor will be high which results in higher motor speed and vice versa. Few other DC motor speed control circuit you may be interested in: 1. Maximum collector current BD139 can handle is 1.5A and so do not use a motor that consumes more than 1.5 amperes of current. Next, we used the software application PCB wizard to easily patent the PCB using the technology or pre sensitized material where we reversed the transferring of. The output of IC1 is coupled to the base of transistor Q1 which drives the motor according to the PWM signal available at its base. Any way maximum Vceo for BD139 is 80V and so Vm should not be exceeded 80 volts. NE555 is wired as an astable multivibrator whose duty cycle can be adjusted by varying the POT R1. In addition to controlling the motors speed its direction of rotation can be also changed using this circuit.Ī PWM circuit based on timer NE555 is the heart of this circuit. Many DC motor speed control circuits have been published here but this is the first one using NE555 timer IC. Description.Ī simple DC motor controller circuit using NE555 is shown here. You check them out and buy them here:- 3 Great Books to Learn 555 Timer Circuits and Projects. CircuitsToday presents an online store which has reviews on 3 books that are considered to be the best in providing the basics and applications of the 555 timer IC. We all know that for better understanding, the best source is an authenticated book on the subject. Are you familiar with all the applications of 555 timer circuits? If not, we can help you.
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