PSU protection with resettable polyfuse

Adrian Graham binarydinosaurs at
Wed Mar 29 10:00:26 CDT 2017

Hi folks,

The PSU for my Executel 8085 system is an Astec AC8151-01 40W 5A unit that
puts out +5/+12/-12V. A while back somone suggested using an ATX PSU in its
place which TBH I'd forgotten about untl I saw a breakout board that you
plug a 20 or 24 pin ATX supply into and it terminates each rail in whatever
you choose to solder in. ukp8, rude not to :)

My only worry is an ATX PSU is capable of putting out a lot more than 5A if
it goes wrong so I'd like to protect each rail with an appropriate fuse.
Any downsides to resettable polyfuses?


Owner of Binary Dinosaurs, the UK's biggest home computer collection?

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