Of course, if you have multiple devices connected to USB hub, USB motor circuits (that includes even plugging a lot of USB HDD drives with USB power) will likely lead to data corruption.
I worked in computers, and power supply noise and EMC (Electro magnetic compatibility) were always a big concern. USB power is designed to handle noise introduced by the loads. Computer systems have a lot of inductive loads. In fact, the power regulators are an inductive load. Now, data integrity is different (and potentially related) concern. Anyway, this guy really doesn't know what he's talking about. He reminds me of the audio nuts who believe that electrons have to flow in a specific direction in copper cables: like directional speaker wires. FUD
Lets strawman and then iron man your arguments: Strawman: Youve already conceded to my concerns about data integrity. Ironman: The most effective way to suppress noise generated by these motors is right at its source. It is always recommended to provide decoupling at the source of the noise (motor), which these USB devices do not provide. A noisy motor has the potential to disrupt even the most well design circuits. If you watch the entire video (which you obviously didn't) i conceded that a well design USB circuit probably wouldn't have an issues. I still didn't recommend using them because of the following: The USB spec max voltage drop called out for a device is 350mV, the fan showed demonstrated a voltage drop of 15 V. Because of the MAX V drop requirement, FLYBACK diodes are not required for a USB circuit. Apple got caught with their pants down a few years ago when people were damaging their devices when they plugged in a fan to their port. USB also require devices to start up and power too 100 mA when requested. These fans do not meet those requirements, and they exceed the 500 mA threshold. As far as those audio nuts, did you even look at my thumbnail?
@@BrunkyTech Yes, brushed motors put horrible stuff back in their lines, not to mention RFI. Back in the real audio days, an add showed one of their power amplifiers, Phase Linear, Marantz, forgot who, running a corded hand drill running off the speaker terminals. Audio used to be hard, lol. The real Acoustic Research of the time had problems with a new speaker line, had a lot of inductance feedback, could trip protections on some amps.
Everything went digital these days. I used to work on RF stuff designed back in the 70's.. Any new component has the potential to break things downstream and attenuation adjustments are always required to be made. Now with everything digital, you can get an IC that handles everything. Match your antenna and impedance, your good. They practically give you the layout.
Skip over the first two minutes, if you so much as passed the fourth grade, or at least a general understanding of how an electric motor works. Wtf. No shit.
![Megan Thee Stallion - Bigger In Texas [Official Video]](http://i.ytimg.com/vi/QxTkZTLWdo4/mqdefault.jpg)
Of course, if you have multiple devices connected to USB hub, USB motor circuits (that includes even plugging a lot of USB HDD drives with USB power) will likely lead to data corruption.
This guy doesn't really understand what he's talking about.
Number 1 comment. I heart for the world to see!
They may be inductive
I worked in computers, and power supply noise and EMC (Electro magnetic compatibility) were always a big concern. USB power is designed to handle noise introduced by the loads. Computer systems have a lot of inductive loads. In fact, the power regulators are an inductive load. Now, data integrity is different (and potentially related) concern. Anyway, this guy really doesn't know what he's talking about. He reminds me of the audio nuts who believe that electrons have to flow in a specific direction in copper cables: like directional speaker wires. FUD
Lets strawman and then iron man your arguments:
Strawman: Youve already conceded to my concerns about data integrity.
Ironman: The most effective way to suppress noise generated by these motors is right at its source. It is always recommended to provide decoupling at the source of the noise (motor), which these USB devices do not provide. A noisy motor has the potential to disrupt even the most well design circuits.
If you watch the entire video (which you obviously didn't) i conceded that a well design USB circuit probably wouldn't have an issues. I still didn't recommend using them because of the following:
The USB spec max voltage drop called out for a device is 350mV, the fan showed demonstrated a voltage drop of 15 V. Because of the MAX V drop requirement, FLYBACK diodes are not required for a USB circuit. Apple got caught with their pants down a few years ago when people were damaging their devices when they plugged in a fan to their port.
USB also require devices to start up and power too 100 mA when requested. These fans do not meet those requirements, and they exceed the 500 mA threshold.
As far as those audio nuts, did you even look at my thumbnail?
Heehee these are called " dc brushless motors" in first sentence.
Yeah I definitely misspoke on that one. Then I described the brush block contact with the commutator.
@@BrunkyTech Yes, brushed motors put horrible stuff back in their lines, not to mention RFI.
Back in the real audio days, an add showed one of their power amplifiers, Phase Linear, Marantz, forgot who, running a corded hand drill running off the speaker terminals.
Audio used to be hard, lol. The real Acoustic Research of the time had problems with a new speaker line, had a lot of inductance feedback, could trip protections on some amps.
Everything went digital these days. I used to work on RF stuff designed back in the 70's.. Any new component has the potential to break things downstream and attenuation adjustments are always required to be made.
Now with everything digital, you can get an IC that handles everything. Match your antenna and impedance, your good. They practically give you the layout.
Skip over the first two minutes, if you so much as passed the fourth grade, or at least a general understanding of how an electric motor works. Wtf. No shit.
Maybe I'll release my 4th grade transcripts if they exist.