Quote:
Originally Posted by lucias
What do you mean by load down another rail? I have looked at making my own power supply and when I read the tutorial from my understanding you can combine them to raise the volts or amps if I am reading it right.. but I am probably misunderstanding it...
|
Computer power supplies have a 3.3v, 5v, and 12v main supplies. The PS circuits sometimes measure the current flow of one of these rails to provide regulation feedback. Since all three rails use the same main transformer, when the PSU increases the PWM signal for more power to one rail, all three get a boost. From experience, it just makes the 12v supply more stable, but doesn't help increase the voltage much, but it depends on the design.
The best methods for actually increasing the output voltage appreciably is to tweak a PCB mounted potentiometer, or use the feedback voltage sense wire. But these methods require certain features to be present, and many PSUs don't have that.