How to get +7 volts from computer power supply?
I have used modded computer power supplies many times to power my creations, but in the past I have always relied on just using either the +5V red wires, the orange +3.3V or the +12V yellow wires. However, most sites that offer advice on diy lab power supplies always say to hook the 12V to the 5V to get the 7V. My question I guess is do I hook the +12V to the +5V to be the new +7V positive, and then rely on one of the black ground wires to be the negative? Or, is it the +12v wire hooked up to my 7V devices positive lead and the +5V wire hooked to the devices negative lead? Any help would be great, kind of stumped. Multimeter was lent to a friend, and I'm not really in the mood to fry electronics to test it. Thanks and sorry for the oddly worded question, having trouble following myself at this point.