Breakout Board for ATX Power Supply – Benchtop Power Supply
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.
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 | SUPPLIER | 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 |
Connections
ATX Power Supply Pinout
Gerber View
Photos
What do you do about the load minimum requirements for the power supply to stay on. If no load it will shut down so isn’t their a load resistor either on the 5 or the 12 volt rail?
Hi. Could you tell me J2 what function does it have? Thanks
Check the NOTE in the article above.