Disclaimer: work with high currents or mains voltage is reserved for electrical professionals!
We have recently shown how to power a project in the short term when reasonable alternatives are not available. Today we would like to discuss the possibility of using an old ATX power supply. AT power supplies still had the problem with load distribution, but with ATX power supplies we could not see any difficulties yet. In our current project, we supply our 3-U64-Led-Panel running-script displays with this solution. To do this, we have switched the three panels in a row, as shown here in the picture:
The problem with these modules is that they draw a relatively large amount of power, so the maximum power absorption at approx. 5 Ampere per panel is when they are controlled with maximum brightness. The power consumption for all panels is therefore at approx. 75 Watt, a demand that we can hardly meet with old power supply. A similar switching network part is traded for approximately 30s by various retailers in Germany. We have purchased the PC power supply used here from a value station.
No modifications are required for use as a 5V network part. If you use an older AT power supply, you may need a load resistor to be able to get full power without damaging the power supply.
I.d.R. The available voltages are summarised in the ATX power supplies, for further projects only one cable per voltage from the housing is sufficient. If you want to convert your power supply to a "laboratory network" part, there are sufficient instructions available on the Internet.
5V is required to operate the LED panel. The available voltages 3.3V, 5V and 12V are colour coded:
So we need red for our panel 1x, for 5V and once black for GND, we start the power supply by placing the green marked pin on the mass/GND. The fan should then start turning and the desired power is available. A video of the 3-panels with 100% luminosity can be found here:
See you next time and have fun at Bastille:)