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Tantalum Capacitor B 35V1UFIBUW
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ATX 90 degree 24-pin adapter |
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-5V Mod for ATX Power Supplies
This little PCB is creating the -5V power rail from the -12V rail.
Some older ISA cards require the -5V as a reference voltage. Unfortunately, with the introduction of ATX Power Supplies, this voltage became less important and was eventually removed.
Modern ATX power supplies do no longer deliver -5V.
Nevertheless, with adapters, it is possible to use ATX power supplies to run retro hardware.
With the -5V missing, some hardware may exhibit unpredictable behavior.
An example is the Creative Sound Blaster 2.0 which does not create sound output when -5V is missing.
Since ATX power supplies are way more reliable compared to old AT power supplies,
a solution to re-introduce the -5V rail is necessary.
Fortunately, -5V is only used as a reference voltage and does not need to deliver much power.
Therefore, a simple linear voltage regulator mod is enough.
In this video, you can see one use case for this project:
-5V Mod for ATX Power Supplies
*PCBWay community is a sharing platform. We are not responsible for any design issues and parameter issues (board thickness, surface finish, etc.) you choose.
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