Written by Fred
Friday, 03 October 2008
An ATX power supply can be a great tool for the electronics hobbyist. Indeed, such a power supply has the following advantages :
This article shows how to re-use an ATX power supply.
CAUTION : As an ATX power supply is plugged on the AC power please make any manipulation with an extreme care.
- It's cheap compared to professional power supplies. Especially if you take it out of an old PC.
- It provides symetrical tensions such as +/-12 V and +/-5V and also +3.3V.
Here follows the pinouts of the ATX power supply :
|1||3.3V|| ||Orange||+3.3 VDC|
|2||3.3V|| ||Orange||+3.3 VDC|
|4||5V|| ||Red||+5 VDC|
|6||5V|| ||Red||+5 VDC|
|8||PWR_OK|| ||Gray||Power Ok (is a status signal generated by the power supply to notify the computer that the DC operating voltages are within the ranges required for proper computer operation)|
|9||5VSB|| ||Purple||+5 VDC Standby Voltage (max 10mA)|
|10||12V|| ||Yellow||+12 VDC|
|11||3.3V|| ||Orange||+3.3 VDC|
|12||-12V|| ||Blue||-12 VDC|
|14||/PS_ON|| ||Green||Power Supply On (active low). Short this pin to GND to switch power supply ON, disconnect from GND to switch OFF.|
|18||-5V|| ||White||-5 VDC|
|19||5V|| ||Red||+5 VDC|
|20||5V|| ||Red||+5 VDC|
This table was taken from the really good website : http://pinouts.ru.
How to use it ?In order to be able to use all the voltages supplied by the ATX power you have to put the green wire (number 14 /PS_ON) to the ground (named GND and black in the table above). In order to stop the power supply, just disconnect the green wire (#14) from the ground to leave it up.
Last Updated ( Wednesday, 06 January 2010 )