Control of DC Motor Speed

[macmmt]

Hi,

I have to control the speed of a motor.

After I get the control signal I need to send it to an actuator to change the speed of the DC Motor.

I was thinking to use a circuit (attached image) with a IC 555 and a MOSFET. So by changing the duty cycle of the PWM I will change the speed of the Motor.

The problem is that the circuit is using a potentiometer to do this job, and I want to use the control signal to change the speed. Please, do you have any idea how I can do this??? Maybe the pin 5 of the 555?? Please help me to find a solution, or what kind of actuator I can use to change the speed of the motor?

Thanks for your help,

Macmmt

 

[MikeMl]

What is the source of your control signal? Is it an analog voltage, logic data stream, Serial Port, USB, parallel binary, etc, etc?

 

[colin55]

Do you want forward and reverse?
What is the actuator? Is is a stepper motor, an ordinary 3-pole DC motor or a SERVO.

 

[syazzy17]

can anybody explain this schematic diagram to me...i got it from a forum which has already been closed so i cannot ask for any explanation...

https://www.electro-tech-online.com/attachments/on_off_on-jpg.6121/

any help would be helpful...

thanks.

 

[ericgibbs]

can anybody explain this schematic diagram to me...i got it from a forum which has already been closed so i cannot ask for any explanation...

https://www.electro-tech-online.com/attachments/on_off_on-jpg.6121/

any help would be helpful...

thanks.

hi,
This question has been answered on your other post.