November 2004
“ATX BREAKOUT” – ATX Power Supply Connector Terminals
and Functionality Tester
General Description
The ATX Breakout is a Small Circuit Board that allows
the user to take an ordinary ATX AC-DC power supply
and easily convert it to a basic power supply with a
very large output current capability. The onboard switch
allows the user to turn the Power Supply ON and OFF.
There is no modification to the off the shelf ATX AC-DC
power supply. Standard Automotive Lugs make
connecting the ATX Breakout to the user application
very easy.
§ “Breaks Out” all major power supply signals to
Solder Pads or Spade Lugs
§ Power Supply Output LEDs on +12, +5, +3.3, -12,
§ >20-amp Output on Spade Lugs (+12, +5, +3.3)
§ Power Supply Signal LED (Power OK)
§ Solder pad points for all main supply outputs
§ Compact Board (2.25” by 2.5”)
§ On/Off switch
§ 2-pin header for remote On/Off switch
§ Minimum Load Resistors for power supply
§ ATX12V 1.1 compliant
The ATX Breakout also doubles as an ATX Power
Supply Tester. There are 6, LED diodes that indicate
outputs/signals: +5, +3.3, +12, -12, Power_OK, and
Figure 1
Product Photo:
§ 12-volt high-current power supply adaptor for
indoor 12-volt computer applications
§ Low Cost Bench Supply with multiple outputs
§ ATX Power Supply Voltage Tester
The typical off the shelf ATX AD-DC 300W power supply can supply 15 amps at 12V, 30 amps at 5V, and 20
amps at 3.3V. The typical 300W OEM power supply can cost less than 30 US dollars, making the adaptation of
an ATX Power Supply to a bench supply, very cost effective. Many commercially available Open-Frame or
Enclosed power supplies with this kind of current capability cost hundreds of dollars. The ATX BREKOUT LEDs
provide a general status to weather or not the corresponding voltage or signal outputs from the power supply are
working. The ATX BREAKOUT does not verify that the voltages are within tolerances; the relative intensity of the
LEDs can be compared to verify the output voltages. A multi-meter is required to verify the accuracy of the
Power Supply outputs.
To use the ATX BREAKOUT board, simply connect the 20-pin connector of an ATX AC-DC power supply, then
connect the output terminals to your application. Click the switch and you have a bench supply.
WARNING: The big ceramic resistors get very hot. It is recommended that the ATX Breakout be placed where
air is flowing over it. Do not touch the resistors after the ATX Breakout has been on for more than 30 seconds.
2004 MPEGBOX. All Rights Reserved.
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