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macklin01 · 05-09-2004, 11:57 AM

I would think that would work.

A sufficient NPN transistor could be connected as follows: base to the positive lead on the fan header; collector to the +12V on a standard 4-pin molex. emitter to the positive lead on the fan. Then, fan's ground lead connected to the ground lead of the 4-pin molex. RPM signal connected if desired.

Another method may be to use a high-speed optical switch or solid state relay. If you could find one of sufficient characteristics, you could use the positive & ground leads of the fan header to control the switch. -- Paul

05-09-2004, 11:57 AM	#2
macklin01 Cooling Neophyte Join Date: Feb 2004 Location: overclockers.com Posts: 5	I would think that would work. A sufficient NPN transistor could be connected as follows: base to the positive lead on the fan header; collector to the +12V on a standard 4-pin molex. emitter to the positive lead on the fan. Then, fan's ground lead connected to the ground lead of the 4-pin molex. RPM signal connected if desired. Another method may be to use a high-speed optical switch or solid state relay. If you could find one of sufficient characteristics, you could use the positive & ground leads of the fan header to control the switch. -- Paul __________________ New Computer: (computational biophysics and chemotherapy simulation) P4 3.0C @ 3.3 GHz / Abit AI7 / 2 x 512 MB PC3500 Recent Post-Processing & Fun Computer: PIII 1.26-S GHz @ 1425 MHz / Shuttle AE25 / 512 MB Kingmax PC150 Samsung DVD-CDRW / Abit Ti4200 128 MB / Creative SBLive! 5.1 My heatware (macklin01)