DIY Macintosh SE/30 & SE AC-DC Power Supply Board

DIY Power Supply Board

This custom-designed PCB lets you build your very own Apple Macintosh SE/30 or SE AC-DC power supply using all-new, modern components. Back in black.

Key Features:

• Compatible with Apple, Sony, and ASTEC versions of the PSU
• No need to harvest components from original PSUs
• Optional pre-assembled cable to connect this board to the analog board
• Includes external fuse for additional safety
• New: Auxiliary 5 VDC & ground connector footprint to for a direct connection of 5 V to the logic board
• Simple build with few components, all through hole construction
• BOM cost for board ~$44 (before tariffs in the USA since the modules are made in China) from major online electronic stores depending on configuration (Apple, ASTEC, Sony)
• Project info conveniently printed on the back of the board
• Drop in bespoke design for the PSU enclosure with minimal impact to the original hardware - keep the original board intact
• Choice of power modules to install to the board to lower the build cost
• Optional LED indicator

The design has been bench tested using an SE/30 outfitted with a PDS 68040 accelerator and Ethernet board and SCSI emulator board. During A/B testing this design has been observed to have less CRT image ripple over a Flex ATX PSU commonly used for PSU modernizations.

New for version 0.6: A footprint was added for an auxiliary 2x2 Molex connector (or soldered connection) to allow for direct connection of 5 VDC to the logic board connector. When a large 5 VDC load is run through the analog board and stock wire harness, the voltage may drop to a level that causes instability or issues with booting. An example machine configuration for a large load would be a heavily upgraded SE/30 with 8x RAM, 68040 accelerator, ethernet board and video board.