Fan control

[bibi]

Hello all!
This topic has already been discussed few times as i saw but I didn’t find info to achieve what i want. Maybe someone is also looking for a similar solution with some electronic skills and we can work together to find the “perfect” solution :p (a relay based solution is omitted on purpose).

The idea is to have a circuit to control 2 fans (12v - 0.33A) with either a mosfet or a bjt with a good schematic that will protect the Pi with some pull-down resistor, diodes, etc and finally cool down the whole mirror when the temp threshold is reached.
If anyone is interested to have such a system and gain knowledge at the same time in electronic, feel free to share ideas.
First objective would be to determine which type of transistor would be the best: mosfet or bipolar and why?

[broberg]

or just a 12v supply with a relay that reacts to the 3v/5v output of the raspberrys gpio …

or just a relay if you already have the 12v supply.

[bibi]

@broberg thx for your input. As mentioned above, i wanted to avoid using a relay to have a silent system

[broberg]

@bibi fan controllers are cheap.

or get 5v fans?

[bibi]

@broberg have already a 5v fan… i am rather interested in gaining knowledge about transistors by building a “project” to cool down my whole MM system.

[harney]

Here is a great system. Fully automatic and silent(ish) with variable control. Took about 5 minutes to make a small board with the resistors and diode and the code is already done.

[link text]https://www.instructables.com/PWM-Regulated-Fan-Based-on-CPU-Temperature-for-Ras/(link url)

[JerryP]

@bibi
I use this one
https://www.elektor.nl/fan-shim-active-cooling-for-raspberry-pi-4

works ferry well