DIY Fan Controller, Voltage Questions

[TehYoyo]

I'm making my own fan controller.

Does anyone know where I can find startup voltages for fans, cutoff voltages (the minimum voltage the fan can go to), etc?

Thanks,
TehYoyo

 

[Conumdrum]

That is scattered at the manufactures web links. Not the sellers. There are lots of fan makers and hundreds of fan sellers that contract a fan maker to make a fan. Then some buy cheap fans and slap a better label on them. Then you have to look at what the manufacturer says vs what is reality. We have seen more than one such major player get laughed to no end and actually changed the official specs. And they didn't make the fans to start with.

You find a site that lists them all please do.

Sorry. It's a wild west ouit there unless you stick with well known fans.

Scythe GT AP-15 fans (really popular, really) are made by Nidec, just as an example. Unless you know Nidec makes them and you decipher the web page you'd never know............

What does your sig say?

 

[TehYoyo]

Should I try to contact the "fake fan maker" directly?

 

[Conumdrum]

Sure. Why not? There are prolly 20 fan makers from India to China and a few other places between.

LOL, like I have time to do it. I'm not Data from ST. Silly boy.

http://www.convertbinary.com/

"Ten bucks says you used a decoder. Tsk tsk." That was the binary answer................

Now make a real sig, your special but it don't help here. Bet you got that from somewhere else and making silly. Good for you. Fun stuff. I liked it.

01101101 01110000 00100000 01110010 01100001 01110100 01101001 01101110 01100111 00100000 01101111 01100110 00100000 01110100 01101000 01100101 00100000 01100110 01100001 01101110 00101110 00100000 00100000 01000100 01101111 01101110 00100111 01110100 00100000 01100110 01101111 01110010 01100111 01100101 01110100 00100000 01110100 01101000 01100101 00100000 01101110 01101111 01101101 01101001 01101110 01100001 01101100 00100000 01100011 01110101 01110010 01110010 01100101 01101110 01110100 00100000 01101111 01100110 00100000 01110100 01101000 01100101 00100000 01100110 01100001 01101110 00100000 01101001 01110011 00100000 01110101 01110011 01110101 01100001 01101100 01101100 01111001 00100000 01100100 01101111 01110101 01100010 01101100 01100101 01100100 00100000 01100001 01110100 00100000 01110011 01110100 01100001 01110010 01110100 01110101 01110000 00101110 00100000 00100000 01001001 00100000 01100011 01100001 01101110 00100000 01100100 01101111 00100000 01101001 01110100 00100000 01110100 01101111 01101111 00101110 00100000 01001001 00100000 01100001 01101101 00100000 01110100 01101000 01100101 00100000 00100111 01001001 01101110 01110100 01100101 01110010 01101110 01100101 01110100 01110011 00100111 00101110 00100000 00100000 01010100 01101000 01100001 01101110 01101011 01110011 00100000 01000001 01101100 00100000 01000111 01101111 01110010 01100101 00101110 00101110 00101110

 

[inVain]

I'm making my own fan controller.

Does anyone know where I can find startup voltages for fans, cutoff voltages (the minimum voltage the fan can go to), etc?

Thanks,
TehYoyo

since you'll build your own fan controller,
you can try to build a first protype ranging 1.25v to 12v.

test all of your fans and monitor the output voltage,
see on what voltage they're started to spinning and you'll get you startup voltages.

 

[tungureanu]

00100000 01001001 00100000 01100001 01101101 00100000 01110100 01101000 01100101 00100000 00100111 01001001 01101110 01110100 01100101 01110010 01101110 01100101 01110100 01110011 00100111 00101110 00100000 00100000 01010100 01101000 01100001 01101110 01101011 01110011 00100000 01000001 01101100 00100000 01000111 01101111 01110010 01100101 00101110 00101110 00101110

01010111 01010100 01000110 00100000 01100011 01101111 01101110 01110101 01101101 01100100 01110010 01110101 01101101 00111111

btw: this IS fun

 

[inVain]

dang with those binaries, I feel like an atmel @.@

 

[NiHaoMike]

You only need to go down to about 5V. That's when most fans stop working. Add a trimpot (or a firmware function for a microcontroller based one) to adjust the bottom end voltage. (Of course, with a microcontroller, you could have it read the speed signal and "learn" the minimum end.)

BTW, there's no need for a closed loop buck controller, open loop buck works nicely and is very easily implemented with a microcontroller.