PC fan BLDC driver circuit reverse engineered

[@sculptaware4548]

You sir just earned a subscribe. This is exactly what I was looking for.

[@tylersutton2216]

yep

[@edgeeffect]

That's so cool... reverse engineer something "trivial" and find out how to make something that was really difficult become rather easy.

[@Howie672]

Thanks mate, great video

[@mariosilva000]

Thanks for sharing the information.

[@diabolicalartificer]

Thanks, this helped me troubleshoot a similar fan that wouldn't spin, though the way mine was put together meant it got destroyed taking it apart : ) Subscribed.

[@arpitjain4025]

very nicely drawn and explained. thanks :)

[@premalathalatha3587]

Thanks for the efforts taken

[@sidamarali3030]

Great indeed. Please what type of transistors can be used in this circuit?

[@HamiltoneUk]

great video. i am trying to work out why some 10 year old 4cm 4-wire 12V DC fans that still spin fine throw up an error signal to a NAS system. Out of 17 fans tested 7 have this problem. only another 37 fans to test. I wonder if they are fixable.

[@visualchallenge2413]

Instructive ... as usual !

[@azeddinebouyadaine4477]

great video and informative 👍

[@universalfacts9168]

Thanks sir great information. Please give me number of transistors which used in this driver circut thanks

[@Hecate2006]

How can i increase RPM of the motor?

[@pierreboyer9277]

Do you know how a 3 pin and 4 pin fan works? I wonder how the third wire count the spins. I'm trying to turn an array of 2 wires fan into a 4 wires fan. Any idea how that could be done using a spare 4 wire fan?

[@pierreboyer9277]

Isn't the third wire which is counting the spins just connected to the U18 pin 3? It sounds like it. What do you think?

[@FanPhys]

3 and 4 wire fans are significantly more complicated - the third wire is a tachometer, usually called "sens", which is a square wave signal based on the rotational speed of the motor. Fourth wire is a control wire which usually takes a 5v square wave and will alter the speed of the motor based on duty cycle.

[@Cubetech]

Nice work man ☺

[@randomtronic]

Jestin P.J thanks!

[@tefatronix]

Typical circuit, similar to some PC fans I disassembled, however it's a bit surprising that there usually isn't any back EMF protection at all (maybe no need for it with the slowed down turn-on/off though)...

[@t.hussain6278]

Thanks. Informative. Keep it up.

[@jp040759]

Very good sir.

[@gartmorn]

I take it that if you want to change the speed you could change the capacitor or resistor size as it is using a simple rc circuit for timing?

[@randomtronic]

I think so. Haven't tried it, but that makes perfect sense. It could introduce startup issues though

[@gartmorn]

@@randomtronic hadn't thought about that. Hard to get my head round. Probably the best way to check it would be to try it I suppose. Not really that bothered to be honest just curious! It probably has a sweet spot covering a certain range of speeds but l could be wrong! ;-)

[@randomtronic]

@@gartmorn makes sense. Likely it can be tweaked a bit within some range, but not too much. But as you said, there is one way to find out :)

[@americanv8ss]

Most fans only have a single chip composed of hall sensor and output coil drivers

[@iblesbosuok]

Wonderful!

[@qureius494]

Thanks dude

[@Drago_Tyson]

How is the transistor "hall U18"?

[@randomtronic]

+Drago Tyson Rojas Mondragón it is a a hall effect sensor. It detects magnetic field from the rotor as it spins.

[@randomtronic]

+Drago Tyson Rojas Mondragón it is a a hall effect sensor. It detects magnetic field from the rotor as it spins.

[@randomtronic]

+Drago Tyson Rojas Mondragón it is a a hall effect sensor. It detects magnetic field from the rotor as it spins.

[@randomtronic]

+Drago Tyson Rojas Mondragón it is a a hall effect sensor. It detects magnetic field from the rotor as it spins.

[@randomtronic]

+Drago Tyson Rojas Mondragón it is a a hall effect sensor. It detects magnetic field from the rotor as it spins.

[@infinity6553]

just connect 3 coils negatives to ground and power the coils using a timing sequence . ie using a decade counter. and you don't need more circuit. except may be powerful switching transistors. like a uln2003 which is a switching transistors packed 10~ of them together.

[@infinity6553]

and just reverse the 4017 and motor witll start running reverse.

[@joshhhab]

Ne555 can drive it with custom timing

[@gordonfreeman1894]

Schematic reminds multivibrator.

[@jankirana3384]

bldc motor has 3 connections but u are showing only 2 connections

[@randomtronic]

I show the 2 that I flipped, 3rd one is left as is. Btw. BLD motor has number of connections depending on how many "phases" it has. 3 phase would have 3 (or 4 if star config), 4 phase would have 4 (or 5), 10 phase would have 10 (or 11)

[@mumtazahmeed8746]

Thank you sir

[@randomtronic]

Mumtaz Ahmeed 👍

[@reptiloidx8942]

@@randomtronic HEY THERE IS THIS A 3 PHASE MOTOR CIRCUIT ??? THANK YA

[@randomtronic]

Hi, no this was a 2 phase BLDC motor.

[@ronbrown8611]

this is great. please do a tutorial on a three phase in its simplest form. with the schematic. if you do that I will subscribe

[@randomtronic]

+Ron Brown I am the only arbitrary who randomly decides on what goes up on this channel. You may sub if you wish. Or you will not if you wish not to. Your subs, your chioce. My channel my choice :) 3 phase motor is not on my agenda anytime soon, sorry :)

[@ronbrown8611]

That's ok.

[@ronbrown8611]

I really do appreciate this video. I think i will study this schematic. I only asked because I liked how you explained it. You showed the direction of the current. I wish people would explain things in a simple manner.

[@randomtronic]

Thanks. I am glad you found my explanation simple to understand. If time allows and I find a 3 phase BLDC motor to take apart, I will see if I can explain it in a simple way.

[@ronbrown8611]

cool

[@sarathmenont5521]

Good try

[@Surendra_Jadhav_official__8552]

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