johndeverill Posted February 24, 2006 Report Share Posted February 24, 2006 Hi all,There is probably a very straightforward answer to this so you will have to excuse my ignorance.I have a PC fan controller that I want to run on batteries. It came with the standard 12v,-ve,-ve,5v molex connector.I connected the 12v wire to a 12v battery pack +ve. I then connected another wire from the +ve to a 5v regulator and onto the 5v wire. I then connected the 2 ground wires and the regulator ground to the battery pack -ve terminal.The LCD backlight comes on and that's it. I am going to be installing this in my car so should all ground connections go to the body earth of the car?If anyone can help with this it would be great as I'm sure it's a simple problem that I just don't have the knowledge to fix.Thanks in advanceJohn Quote Link to comment Share on other sites More sharing options...
ante Posted February 24, 2006 Report Share Posted February 24, 2006 Hi John,If you can, post the circuit you have made so we can see what’s wrong!BTW, have you tested this fan controller in its normal environment to make sure it’s OK? Quote Link to comment Share on other sites More sharing options...
johndeverill Posted February 24, 2006 Author Report Share Posted February 24, 2006 Hi Ante,Yup it worked OK connected to the PC.The circuit below is a bit simplistic but is colour coded as per the PC molex connectors. Quote Link to comment Share on other sites More sharing options...
Staigen Posted February 24, 2006 Report Share Posted February 24, 2006 Hi, sorry to interruptOne big error here, the yellow wire in a standard computer molex connector is 12V, and the red one is 5V!Maybee also the 5V regulator is connected wrong then! Check!//Staigen Quote Link to comment Share on other sites More sharing options...
ante Posted February 25, 2006 Report Share Posted February 25, 2006 Hi John,Yes Staigen is correct! If you rewire it the right way and have a bit of luck here (if nothing got destroyed) it should work fine! Quote Link to comment Share on other sites More sharing options...
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