Dear all BIG BIG,
I saw that many pepole using computer power supply to provide DC12V to FAN and other equipment.
But the computer supply may be too big and difficult to handle by new DIY user. So I suggest to use this one cause I'm playing R/C car before also using this to supply power for DC FAN. Hope this useful for you!
Remark: I haven't relationship with this company, just hope can help guy who want to DIY.
You can buy it at most R/C shop locate at Yan On Bidg., Dundas' St., Monk Kok ( near Ho King Comm. Bldg.........4/F have 4 son

)
The photo and spec provide by:
www.apexhk.com
APEX SWITCHING POWER SUPPLY V12
Features:
Designed to be used with APEX DELTA, DELTA+, SIGMA.
Increase running / flying time of NICD by up to 5%.
Prevents output ampere drop near the end of a charge.
output short circuit and overload with fuse protection.
Maximum output 7A.
Built-in an internal cooling fan.
Specification:
Input Voltage: AC 220V
Output Voltage: DC 14V to 11V
Output Current: Max. 7 Amp.