I have a 230 Volts fan from EBM papst. It is a fan that can be controlled through a PWM signal (between 1 and 10 kHz). I have built the circuit that is in the manual (see image)
I did get this working using a 5.0 Volt arduino clone. I have been able to change one of the timers, so I am able to get a clean 4 kHz pwm signal on digitalOut 4. The fan responds nicely.
But I would like to get it working on another arduino clone that runs on 3.3 volt, currently I am getting no response at all from the 3.3V circuit.
The only thing I can think of that is different is the PWM voltage. The 3.3 volt arduino clone only makes 3.3 volt peak-to-peak, whereas the other arduino does to at 5.0 volt.
My question, can this be solved by choosing a different transistor? And if so, what specifications should I look for?
And otherwise, what other information is useful to know? I have some basic measurement equipment including a simple oscilloscope, but I don't know what to look for.
Page 4, not the exact same fan, but the same schematic, could not find the correct one at the moment.