Ah !!
A good old’men recommandation
Yep! Any BC108 or BC547 will do and 1N4001 for the reverse bias protection. 1N4148 doesn’t have the power rating to sick the high ENF induced current.
Ah !!
A good old’men recommandation
Yep! Any BC108 or BC547 will do and 1N4001 for the reverse bias protection. 1N4148 doesn’t have the power rating to sick the high ENF induced current.
By chance, I also came across a variant with a MOSFET that should be able to drive also 12V fans.
Apparently, the software PWM control of a fan is as annoying as the backlight. I found another article explaining the troubles (more noise, of course!). The article is rather verbose and also explains in detail how everything works (practical for beginners & forever-beginners! :)) and the difference between using a BJT and MOSFET transistor (and why the latter might be preferred).
Thks, interesting lecture, they are there a couple of good posts
Hm. Looks like my cheapy creepy little fan is not really PWM friendly. It does not turn unless I set 100% duty cycle. If I set the frequency up to 1MHz, I can go some way down from 100%, but it makes an annoying high frequency sound/noise.
Or may it be a problem of the wiring? I used a BS170 mosfet. When connected directly to constant 3.3V instead of 5V, it turns well and more slowly.