PSU hacks or pinouts

[Fraggle1]

Hi all,
I seem to remember that some time ago, someone posted a link to a site that had details of how to hack a PC PSU to power an Amiga, as an external unit.
I lost the bookmark when Firefox crashed a couple of months ago, and now I need to make up another PSU, as the +12v rail on my old one died this morning.

If anyone could remind me where to find this link, I'd be much obliged, or alternatively, tell me where there's a diagram of the "brick's" pinouts.

TIA, fraggle.

[Fraggle1]

Thanks for the replies, really helpful.
I have a few 150 and 200 watt AT PSUs, so I'm sure that I'll now be able to convert one of them.

Thanks again.