PWM Motor Speed Control Circuit

PWM Motor Speed Control

Description

Here is a simple PWM motor speed controller circuit that can be used for varying the speed of low power DC motors . The variation in speed is achieved by varying the duty cycle of the pulse supplied to drive the motor. Of the two gates of IC CD40106B , N1 is wired as an inverting Schmitt Trigger astable multi vibrator for producing pulses and N2 as an inverting buffer to drive the transistor during positive cycles at base. The duty cycle is set from resistor R2. R1 limits the base current of transistor SL 100. The circuit is ideal for controlling toy motors,hand held mini fans , small blowers etc.

PWM Motor Speed Control Circuit Diagram with Parts List.

PWM DC Motor Speed Control

PWM Motor Speed Control Circuit Diagram

Notes .

  • By varying R2 duty cycle can be varied from 0% to 100%.
  • For identifying pins of SL 100 ,the pin that is connected to casing is collector,the pin near to notch is emitter and the one remaining is base.

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Show Comments

9 thoughts on “PWM Motor Speed Control Circuit

  1. Johne600

    I am just seeming both for blog sites which give independent, nutritious commentary on all difficulties or blogging sites which have a liberal or droppedwing slant. Thank you.. bgdaafekegga

    Reply
    • Seetharaman

      Hi Divya it is a hex Schmidt and housed in 14 PIN DIL package. each schmidt has one input and one output. 6 X 2 =12pins plus 2 for supply hence 14 pin package.

      Reply
  2. buletov

    Hi, can you please list some alternatives on the parts CD40106B and SL100? My two local stores don’t have those exact items in the offering, but do have many similar ones…

    Reply
  3. deep

    Thank you so much to give me acircuit diagram thats why my project is made easily. so please give me a new circuit diagram on my e-mail ID.

    Reply

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