I was experimenting with a device I made  using the 12 volt leg of one of
my AT power supplies as the power source. I inadvertently shorted the PS
out...I know the cause..... and blew the PS internal SAE 4A 250VAC fuse.

I had  a SAE 4A 120V fuse that I soldered on the board thinking that in as
much that I will never flip that 250 volt setting switch on the back of the
PS and  would always  run at 115volts AC the fuse should be fine. However
when I powered on I got a big blue light  and fuse was gone. Obviously I
need a 250 volt fuse...but why if I am inputting 115 V AC?

m

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