I'm pretty new to the field: I'm a hobbist. I'm trying to drive a fan (H412R) which runs on 12 V, 0.2 A with an Arduino board, as it is easier for me to generate a PWM signal to control the fan speed.
The problem is that the Arduino outputs at best just 5 V with 40 mA of current. Now my task should be to build a power transformer circuit that amplifies both voltage and current to the desired level. This is what I was thinking about:
- amplify the voltage using a boost circuit from 5 V to 12 V (the boost circuit would like the one presented in this article, with the PWM signal given by the Arduino)
- amplify the current using a transistor current amplifier from 40 mA to 200 mA Is this functional? Can this design help me achieve what I need?
In the end I think that this problem can be seen as a circuit that can amplify the power from 0.2 W to 2.4 W.