I want a fan on top (like you did), but can't understand how it will be controlled, turned on and off.
Also I don't get how to connect the picoPSU and the NUC PSU together to the original 19v, can you help me to understand it?
Thank you
Hello Barenhvrd, the fans in my iMac G4s are controlled by a Picaxe Microcontroller, but this is only to totally silence the machines and isn't absolutely necessary. The included Ultra-Low Noise Adapter with the Noctua NF-B9 (link
here) will allow simple connection to 12V and GND on the PicoPSU to give a nearly completely silent fan. Voltage is reduced enough to slow the fan to a very quiet speed by simply plugging the ULNA into the 12V line.
The NUC 65W PSU has a single 19V line with a 5.5/2.5mm male plug on the end. Only about 12 inches of this line is needed to reach the NUC, so this is what I did...
1) Cut the cable off about 12" from the NUC.
2) Cut 12" piece off of that piece of cable.
3) Strip both ends back about 3" on the piece in (2)
Note: The inner wire is hot, the outer silver shielding is the GND, careful not to strip it off.
4) Strip the end back 3" on the cable attached to the NUC.
5) Strip end back 3" on the cable with the 5.5/2.5 plug on it
6) Twist all silver shielding (on all ends) tightly into a single larger strand for soldering
7) Solder hot centre wire on 5.5/2.5 and extra piece to the hot wire attached to NUC
8) Tape the hot wires to insulate from short.
9) Solder the twisted silver shields from the 5.5/2.5 and extra piece to the twisted GND of NUC
10) Tape the GND wires to insulate from short
11) Cut off and strip the black/white wires from the PicoPSU
12) Solder the remaining end from the extra cable (Center hot wire to white, Silver shield to black) on the PicoPSU.
Hope this helps.
Cheers!