Modded PC power supply for charging

[BrianG]

When I was using the voltage divider circuit method, 1A was needed reason for the calculations to work right. Only when I used the diode method did things work right mathematically, and actually. Besides, drawing 1A all the time reduces the available current for the real load (charger), so it all worked out in the end.

The PS specs do say 0.8A min is needed, but it seems to work fine with no load. However, I am drawing 0.250A, and the fan draws about the same, so it's close to the spec'd 0.8A.