I wanted to share this layout for a brand new PCB that I've just about finished, one of my first proper designs.
It is intended to fit like a glove inside the Delta power supply housing that's common to the Quadra 840AV and Power Macintosh 8100. These PSUs are failure-prone and notoriously difficult to repair, so I was keen to come up with a classier solution than just stuffing an ATX PSU inside the case with an adapter and calling it a day.
The new PCB replicates the exact dimensions as the original Delta lower PCB. It's designed to have the internals of an ATX power supply stood off above it as a mezzanine board. I've laid it out to accept an Antec EarthWatts PSU I had available, but it could likely be adapted to other models just by adjusting the locations of the four standoff mounts.
The design reuses the stock AC inlet board, and incorporates both the original monitor passthrough power relay and fan control logic.
The 20/24 pin ATX harness is intended to be cut short and looped into the +12V, GND, -12V, +5V, PS_ON and +5VSB vias seen at the top of the new PCB. This is so a soft power inverter can be integrated, and also allows the original modular Mac PSU connector to be fitted in its original location.
I've mocked up the design mechanically by using the old Delta PCB as a base, it's very sturdy.
I'll get this sent off to print shortly. Once I'm happy the design functions as intended, I'll of course be making it available on Github
It is intended to fit like a glove inside the Delta power supply housing that's common to the Quadra 840AV and Power Macintosh 8100. These PSUs are failure-prone and notoriously difficult to repair, so I was keen to come up with a classier solution than just stuffing an ATX PSU inside the case with an adapter and calling it a day.
The new PCB replicates the exact dimensions as the original Delta lower PCB. It's designed to have the internals of an ATX power supply stood off above it as a mezzanine board. I've laid it out to accept an Antec EarthWatts PSU I had available, but it could likely be adapted to other models just by adjusting the locations of the four standoff mounts.
The design reuses the stock AC inlet board, and incorporates both the original monitor passthrough power relay and fan control logic.
The 20/24 pin ATX harness is intended to be cut short and looped into the +12V, GND, -12V, +5V, PS_ON and +5VSB vias seen at the top of the new PCB. This is so a soft power inverter can be integrated, and also allows the original modular Mac PSU connector to be fitted in its original location.
I've mocked up the design mechanically by using the old Delta PCB as a base, it's very sturdy.
I'll get this sent off to print shortly. Once I'm happy the design functions as intended, I'll of course be making it available on Github
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