nothacking

@nothacking@discuss.tchncs.de

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Small fan switch sanity check. (lemmy.world)

Circuit is for controlling the fan on a Raspberry Pi, just on/off according to temp, no PWM. Not sure about the diode as it has a .7V drop and it’s a tiny brushless DC motor. No markings on the fan so I measured the current with a multimeter when hooking it up to a USB charger. Circuit was adapted from here using what I have...

nothacking,

It’s fine, won’t cause any problems.

nothacking,

Thanks for checking the datasheet!

nothacking,

Doing some quick math, the transistor will have a base current of 5 milliamps, which a Pi should be able to supply. At a fairly typical beta of 100, the transistor could drive the fan at up to .5 amps, which is plenty for a small fan. A MOSFET transistor is generally better suited for switching high current loads, but for this a BJT (as drawn) should be fine.

nothacking,

Hey, could you unlock your phone and hand me it so I can scroll through all your texts? No? Then you do have something to hide.

If that doesn’t work, try search history.

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