Re: PSU protection with resettable polyfuse
On Wed, Mar 29, 2017 at 9:24 AM, Systems Glitch via cctalk < cctalk@classiccmp.org> wrote: > > Any downsides to resettable polyfuses? > > If you hit them hard enough, they'll sometimes permanently open, which is > desirable anyway but does require rework. I don't remember how they stack > up speed-wise, I'm sure it's in the datasheets. > They're not very fast. They're comparable to a slow-blow fuse.
Re: PSU protection with resettable polyfuse
On 29 March 2017 at 16:24, Systems Glitch wrote: > If you hit them hard enough, they'll sometimes permanently open, which is > desirable anyway but does require rework. I don't remember how they stack > up speed-wise, I'm sure it's in the datasheets. I don't mind that, better rework that distribution than whatever's been belted. I didn't know resettable fuses existed until I accidentally zapped a Raspberry Pi by dragging it under my metal iMac. That's got a 2A polyfuse and it was back in service 30 mins later. -- adrian/witchy Owner of Binary Dinosaurs, the UK's biggest home computer collection? www.binarydinosaurs.co.uk
Re: PSU protection with resettable polyfuse
> Any downsides to resettable polyfuses? If you hit them hard enough, they'll sometimes permanently open, which is desirable anyway but does require rework. I don't remember how they stack up speed-wise, I'm sure it's in the datasheets. Thanks, Jonathan
PSU protection with resettable polyfuse
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? Cheers, -- adrian/witchy Owner of Binary Dinosaurs, the UK's biggest home computer collection? www.binarydinosaurs.co.uk
