Breakout Board for ATX Power Supply – Benchtop Power Supply

Rajkumar Sharma
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SKU: EL126087
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This ATX Power supply breakout board enables users to use an ATX power unit as a benchtop power supply. The project can be very useful to power physical computing, embedded, microcontroller projects, etc. The board provides 4 different voltages 3.3V, 5V, 12V, -12V, and a slide switch is provided for output ON/OFF. All lines have LEDs. Basically, the project splits 20 or 24-pin ATX power supply connector into 4 different power lines. All outputs are accessible through banana connectors.

Note: The board can also be connected to a very old type of ATX SMPS with -5V output, in this case, use Jumper J1 to select the -5V and CN4 banana connector to provide -5V output. Otherwise, connect the Jumper J1 to GND and CN4 is available as GND output.

Connections and Components info

D1 LED-Red Indicates 3.3V
D2 LED-Green Indicates 5V
D3 LED Do Not Install (Use with old-style power supply with -5V Output)
D4 LED-Red Indicates 12V
D5 LED-Green Indicates -12V
D6 LED-Red Indicates Power Good
D5 LED-Yellow Indicates Power Supply Standby Condition
CN1 20 or 24 ATX Connector for Power In (Molex Digi-Key # WM20494-ND)
CN2 3.3V DC Output
CN3 5V DC Output
CN4 GND or -5V for Optional Old-Style Power Supply
CN5 12V DC Output
CN6 -12V DC Output
CN7 GND

Features

20 or 24 ATX Connector as Input
Outputs 3.3V, 5V, 12V, -12V, GND
Load Current depends on ATX power Ratings
6X Banana Connectors for 3.3V, 5V, 12V, -12V and 3 X GND
Power Good LED
On/OFF Slide Switch
LEDs for 3.3V, 5V, 12V, -12V
LED for Power Good Indication
LED for 5V Standby
Board Can accommodate 20 or 24 Male Connector
Banana Connector Holes 6.5mm with 13mm Solder Pads
4 χ 4.2MM Mounting Holes
PCB Dimensions 98.27 x 53.34mm

Schematic

Parts List

NO	QNTY	REF.	DESC	MANUFACTURER	PART NO
1	1	CN1	24 PIN ATX RT CONNECTOR	MOLEX
2	3	CN2,CN3,CN5	BANANA CONNECTOR RED	POMONA ELEC	501-1095-ND
3	3	D1,D4,D6	LED-RED 3MM	AMERICAN OCTO	2460-L314HD-ND
4	2	D2,D5	LED-GREEN 3MM	AMERICAN OCTO	2460-L314GT-ND
5	3	J2,R3,D3	DNP
6	1	D7	LED-YELLOW 3MM	AMERICAN OCTO	2460-L314YD-ND
7	1	J1	3 PIN MALE HEADER PITCH 3.5MM	WURTH	732-5316-ND
8	1	R1	150E 5% SMD SIZE 0805	YAGEO/MURATA
9	3	R2,R6,R7	470E 5% SMD SIZE 0805	YAGEO/MURATA
10	2	R4,R5	1K 5% SMD SIZE 0805	YAGEO/MURATA
11	1	SW1	SLIDE SWITCH	E-SWITCH	EG1903-ND
12	1	J1	SHUNT FOR JUMPER J1	SULINS CONNECT	732-5316-ND
13	3	CN4,CN6,CN7	BANANA CONNECTOR BLACK	POMONA ELEC	501-1094-ND