Hi nemercry,
bist du sicher dass die Fan-Mod eine gute Idee ist? Ich wollte das auch machen, aber Wolfey sagt dazu:
DO NOT CONNECT POWER TO THE FAN THIS WAY THROUGH THE VOLTAGE REGULATOR!
It's not actually connected to a 'real' - ground source. It's floating and that is dangerous in itself and could harm the electronics of the pod if the fan goes bad or there is a short.
It's not a valid solution electrically speaking the way it is powered on the 12V rail side using the Voltage Regulator as a floating ground connection. That is not what it's made to do.
Gruß, David
Hallo David,
zig hat das ganz gut erklärt.
Solange die Last auf dem Bauteil unter 3A liegt passiert nichts. Ich würde die 0,2A vom Lüfter ehrlich gesagt lieber über den GND abführen anstatt die 0,2A über die (zumeist) schrottigen USB Hubs zu ziehen.
Und dort hast du dann viel schneller Probleme wenn dein Netzteil vom Hub an seine Grenzen kommt.
Can someone post details/pictures of the 5v fan mod? Is there another point to solder the fan leads to? Is it dangerous in any way (dangerous in terms of load to the newly utilized power circuit)?
Speaking of Fan mod...for silent operation...:
With all my due respect to Wolfey's solution...There is another "Classic Silent fan" solution from the CPU overclocking experience...7V fan driving...between 12V and 5V power lines...
![Wink](https://bitcointalk.org/Smileys/default/wink.gif)
How...: Disconnect the GROUND/BLACK wire from the original position...and solder back to the 5V regulator uP1707 output...this is the small / medium size 8-pin chip to the left of the 12V PS supply connector...the easiest point to connect are to the big output SMD caps to the right of the IC...C201/C203...their pins towards the center of the board...facing the square inductor close to them...this is 5V output supply...
uP1707 is rated for up to 3A...so the current load of the fan should not have any effect on the circuit...
Mine is running whisper quiet @ 6.69V...11.82V - 5.13V ...
IMHO this is better solution ...because of the higher voltage...better performance/cooling...but still silent/no noise...not creating ANY load to 5V USB supply, preventing possible issues with USB hub(s) with many Gridseeds...not having enough juice...etc...
P.S. I am assuming that everybody, interested in these mods, has already PDF schematics of the 5-chip Gridseed device from...:
https://github.com/gridseed/usb-miner/tree/master/hardware