Can this be used for PWM?

[usernameee333]

I want to use 5V triggers to control 12V or 24V DC circuits in PWM speed control.

Can this board be used for this, with just opto-couplers without a MOSFET?

https://m.aliexpress.com/item/4000459030365.html

[DrDiettrich]

Please give a link to the data sheet of a specific module.

Motors or other load?
Motor current? Max. 10mA without a MOSFET.
One direction only?
Precise speed control required?

[mb107]

Not sure if I was doing the same thing here. But this was a thread where I used an opticoupler to drive a 12V PWM fan. There was no Mosfet involved and it worked really well.

Trying to use an Opticoupler

I am building a fan controller for a PWM fan for a Mercedes Benz. The fan is a 600W fan controlled by a the engines main computers. For the moment I am using a Yourdrino RoboRed which is similar to an Arduino Uno except it has a higher power 2000ma power pin on it. I have successfully got this fan to run perfectly using the PWM signals directly applied to the fan. The fan requires a 10Hz 0 to 5V PWM signal and the output has driven it directly with no further conditioning required. However I am …

[DVDdoug]

@mb107

Not sure if I was doing the same thing here. But this was a thread where I used an opticoupler to drive a 12V PWM fan. There was no Mosfet involved and it worked really well.

I'd guess the BMW fan has a MOSFET controller built-in. 600W / 12V = 50 Amps!!!

[mb107]

It is a Mercedes fan, 600W, may very well be the same Bosch motor as in the BMW. I have no idea whats inside the motor. All I had to do was ground the signal at 10Hz at a controlled duty cycle with the opticoupler.

[Paul_B]

@usernameee333

I want to use 5V triggers to control 12V or 24V DC circuits in PWM speed control.

Can this board be used for this, with just opto-couplers without a MOSFET?

Link corrected: https://www.aliexpress.com/item/4000459030365.html

Well, it can be used to drive a logic circuit which in turn controls a PWM controller, but that is the end of it.

It cannot directly drive any sort of motor, light or other device at all.

[anon35827816]

@mb107

All I had to do was ground the signal at 10Hz at a controlled duty cycle with the opticoupler.

Which only works if there's a driver built into the fan. In general when someone says "I need to pwm somrthing on 12V" best assume a driver is NOT yet part of the system. The fact that you happened to have the driver built into your device is the exception, not the tule.