Had some old motherboards leftover that had plenty of 3 pin fan headers on them so I desoldered em all (7 total) and used them to build a 12v/5v multiple fan header switch.
Standard 4 pin molex power IN with fuses on the 12v and 5v lines, fused power wires lead out to the switch, and one power line leading from the switch to the fan header bank.
I salvaged the 4 pin molex connector from a old CDROM drive power board. Also using the old cdrom drive metal case as a switch bay, to hold my custom power/reset buttons, and fan doohicky. The case is open in the back, with a hole in the bottom, near the middle. I can route my main power cables through the back and down through the hole, to the back side of the drive cage, as well as all the fan power plugs up through the hole, to the fan doohicky. Should help with cable management, although, the motherboard main connector barely fits through.. May have to open the hole up a little more. No RPM monitoring through the doohicky, however, I can always take the fan rpm wire out of the fan power plug, then plug them into the motherboards chassis fan headers to keep track of my Radiator/chassis fan RPM if I need.
Got the breadboard and fuses from radio shack
Standard 4 pin molex power IN with fuses on the 12v and 5v lines, fused power wires lead out to the switch, and one power line leading from the switch to the fan header bank.
I salvaged the 4 pin molex connector from a old CDROM drive power board. Also using the old cdrom drive metal case as a switch bay, to hold my custom power/reset buttons, and fan doohicky. The case is open in the back, with a hole in the bottom, near the middle. I can route my main power cables through the back and down through the hole, to the back side of the drive cage, as well as all the fan power plugs up through the hole, to the fan doohicky. Should help with cable management, although, the motherboard main connector barely fits through.. May have to open the hole up a little more. No RPM monitoring through the doohicky, however, I can always take the fan rpm wire out of the fan power plug, then plug them into the motherboards chassis fan headers to keep track of my Radiator/chassis fan RPM if I need.
Got the breadboard and fuses from radio shack