Use that old PC Power Supply as a high current +3.3, +5 or +12 volt resource
introUse that old PC Power Supply as a high current +3.3, +5 or +12 volt resource
When the power supply for my Belkin USB 4 way crossover went belly up I needed a +5 volt supply capable of outputting a minimum of 2 amps. An old 12 volt car battery charger could easily power an LM323 3 amp 5 volt IC but it would take a week to get it. The biggest wall-wort I had was .700 milliwatts.
Enter my old power supply from where I found it under the bed. In addition to providing me with a high current +5 volt supply it gave me a high current +3.3 and a +12 volt supply as well. All I needed to make it work was a load on the +5 PSU bar provided by my Belkin but any +5 volt resistive/inductive load, such as a case fan or a 10 ohm, 10 watt resistor, will do.
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Enter my old power supply from where I found it under the bed. In addition to providing me with a high current +5 volt supply it gave me a high current +3.3 and a +12 volt supply as well. All I needed to make it work was a load on the +5 PSU bar provided by my Belkin but any +5 volt resistive/inductive load, such as a case fan or a 10 ohm, 10 watt resistor, will do.
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Try using an old but still working case fan. If you have the power supply you are bound to have one of these. Otherwise you can find them online for about $8 plus shipping. You can also use a 10 ohm, 10 watt resistor or maybe one that is even smaller for less than $1. To find out you'll have to experiment. Why do you need a case fan or a resistor anyway? Well its beca…
The connector that exits the power supply has a male connector with female pin sockets. When the key (rounded edges) are facing up the red +5 volt lead is on the right and the yellow +12 volt lead is on the left. The connector you want to modify is the female connector with the male pins, coming from the fan. Notice how the red +5 volt lead is now on the left and the …
Both the P8 and P9 connector have ground connections but the ground connection on the P8 connector is what to use since most 10 ohm, 10 watt resistors have axial leads rather than radial although these are made too. The axial leads are not quit long enough to use the P9 connector by itself. Use the resistor to bridge one of the output grounds on the P8 connector and on…
The hard drive connectors coming from the power supply are male so you have two options to complete this step when tapping the +5 and +12 voltages. A. use a female connector and tap its leads, or B. cut off the male connector and use the power supply leads. I used an old female-to-male floppy drive connector, removed the individual pin connectors and used alligat…
Go there...
http://www.instructables.com/id/Use-that-old-PC-Power-Supply-as-a-high-current-%2b3./
I want to try this with my Network Switch that has a bad Power Supply. Need to make sure it will not over power it and burn it up though...
Don
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