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Are ATX power supplies regulated?
The ATX specification says that the power supply is allowed to output voltage with regulation and ripple within a certain tolerance. The ripple can be as much as 1% and still be within specification. That means you can have as much as ±120mV of ripple on the +12V.
What is ATX and BTX?
ATX stands for Advanced Technology eXtended. BTX stands for Balanced Technology eXtended. Meaning. ATX is a form factor of the motherboard which was introduced to replace the standard AT design. BTX is a form factor of the motherboard which was initially designed to replace ATX.
What is the main function of ATX power supply?
ATX power supplies are turned on and off by a signal from the motherboard. They also provide a signal to the motherboard to indicate when the DC voltages are in spec, so that the computer is able to safely power up and boot.
How does an ATX power supply work on a computer?
An ATX PSU (power supply unit) provides DC current for a computer in a number of voltages. It has a built in fan for cooling and delivers the various voltages to the computer via the power outputs. The wires in an ATX power supply are color-coded with different colored wires:
Can you convert an ATX PSU to a 12 volt?
Most online references fall into two categories — converting an ATX PSU into a bench power supply or a dedicated 12 volt power supply. Sometimes the instructions on the 12 volt conversions don’t include some of the finer points as the bench supply conversions. This article goes into more detail on some of the finer points:
Can a 12 volt power supply be used as a bench supply?
A 12 volt power supply does not need to be as complicated as a bench supply. You only need 2 outputs (ground terminal plus 12 volt terminal). I decided to use a dual binding post with red and black terminals. This makes it easy for the user – no LEDs and no separate switch for the outputs.
Where is the 3.3V sense wire on an ATX PSU?
The brown +3.3v sense wire may not be present in some ATX PSUs and also may not be brown, exactly. If it is present, it must be joined with a +3.3v wire. If there is a +3.3v sense wire you will see it on the main power supply connector sharing one of the pins with an orange wire.