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Need help making a dual volt switch for my fanbus

A

agentK

Senior member
pm'd talonts already but in case he doesnt reply...

...i am not an electrician and as such am greatly handicapped with the project i am about to do. i have just modded my case... enlight 7237 (pic will be coming soon) and have just made a fan bus. i read somewhere on instructions on how to create a dual volt switch using the +12v and +5v from the molex connector. i went out to the electronic store and bought myself 5 toggle switches at 60 Php (about $1 and 2 cents). they describe it as on - off - on. it has six connectors at the back, two side by side in three rows. written on one side of the TS is 3A 250VAC and on the other side 6A 125VAC. did i just get the wrong kind or will these things work just the same.

also, i heard you suggesting on a 3pole dual color led. did i get it correctly? this would greatly help my design since 5 switches will be a bit crowded, i think.

last but not least... will 5v be enough to power my 2 120mm fans? read about "start up voltage" and dont have a clue about it. i also read somewhere that i can join the 12v and the 5v to get an output of 7v instead. i thnk 7v will be better.

TIA!

Ken
 
Most 12V fans will start rotating at 7V, but yeah, 5V is probably not enough. As far as the wiring and the toggle switch, I can help with that...

To achieve the 12V/7V setup, first look at a typical 4-pin power connector like you would plug into a hard drive. The yellow wire is +12V, the red wire is +5V, and the two black wires are ground (0V).

Hook your fanbus's positive wire up to the +12V wire from the power supply (the yellow one).

Now wire your fanbus's negative wire to one of the center connectors on the switch.

Attach one of the power supply's black wires to one end of your toggle switch, and attach the power supply's red wire to the other end of the toggle switch. This setup will connect your fanbus's ground wire to either the 0V wire or the +5V wire. Since your fanbus's positive wire is connected to +12V, the total voltages seen by the fans are 12V - 0V = 12V for the one side, and 12V - 5V = 7V for the other side. Hope that helps out! 😀
 
This sounds like the baybus you want to build. And assuming you set up the switches and its LED's in columns, space really isn't an issue, though more LED's do add to the clutter.
 
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