Compact ATX Breakout Board

It sucks when you need 12 VDC and your power supply just died.  Previously we made an ATX breakout board to turn an ATX power supply into a fixed voltage bench DC power supply.  Here we present a board that is designed to be smaller and for use as a backup.

This little board is geared towards those in the amateur radio community that are into emergency communications and have their own personal \”bag of tricks\” that they take with them wherever they go.  It\’s a compact PC to Switching DC power supply board.  It\’s got just enough real estate for the connectors.  It\’s designed to power up the power supply as soon as the 20/24 pin ATX header is plugged in (PS_ON# shorted to ground).  There are separate connectors and circuits for drawing power off the 12V auxiliary connector (4 or 8 pin connection), PCI-E auxiliary power (6 or 8 pin) and from standard ATX peripheral connector.  This allows the board to run a full ATX power supply or to serve as adapters for unused connectors in a computer.  RF blocking capacitors were added to the PCI-E and ATX peripheral connectors as they are the ones that might be used simultaneously with a computer.

Here are the Gerbers and the Bill of Materials:

P/N: 10022
Description	Designator	Manufacturer	P/N	Qty.
ATX v2.0 Motherboard Header	H1	Molex	442060007	1
ATX Peripheral Power Connector	H2	Molex	15244742	1
PCI-E 8-Pin Power Header	H3	AMP	1586041-8	1
ATX 12V EPS Header	H4	Molex	39-28-1083	1
2×1 Powerpole Assembly	H5, H6, H7, H8	Anderson Power Products	1377G12	8
2×1 Powerpole Assembly	H5, H6, H7, H8	Anderson Power Products	1327G6	4
2×1 Powerpole Assembly	H5, H6, H7, H8	Anderson Power Products	1327	4
RF Blocking Cap, 100 pF	C1, C2	Various	Various	2