ATX Power Supply Breakout Board – 3.3V / 5V / 12V / −12V Outputs

An ATX power supply breakout board that converts a standard 20‑pin or 24‑pin PC power supply into a convenient bench power source. Connect an ATX PSU and access regulated rails at +3.3 V, +5 V, +12 V, −12 V, plus 5 VSB (standby) for always‑on logic. (Works with 20‑pin and 24‑pin ATX connectors.)

Front‑panel screw terminals provide quick connections for project wiring, while six onboard USB ports deliver 5 V power for peripherals and devices. Status LEDs indicate power good, and an onboard switch controls PSU on/off without unplugging. Ideal for prototyping, test jigs, CNC, and classroom labs.

Key Features

• Compatible with 20‑pin or 24‑pin ATX power supplies
• Accessible +3.3 V, +5 V, +12 V, −12 V and 5 VSB rails
• Six USB ports, each providing 5 V up to 2.1 A (device‑dependent)
• Power‑good indicator LEDs for quick visual status
• Onboard power switch to toggle the PSU on/off
• Screw terminal block for clean, tool‑free wiring

Applications

• Bench power for electronics prototyping and education
• Power distribution for CNC controllers and test fixtures
• Repurposing surplus PC ATX supplies for hobby projects

Notes

• Standard ATX supplies provide the main rails (+3.3 V, +5 V, +12 V) and 5 VSB standby; PS_ON# logic is used to switch the main rails—handled by the onboard switch on this adapter.
• USB output current depends on the PSU capability and connected device draw.
• Observe correct polarity and fuse ratings on the attached PSU. For best results, use a known‑good ATX unit sized for your load.

Board Features

Board Dimensions