9V AC Power Brick for Atari 8-bit

DC power supplies are simple and easy to get with modern switching supplies accepting pretty much any input mains voltage and producing well-regulated DC. AC voltages for computers from the 80s are a little harder - the Atari computers that this power have the regulation inside the computer housing and just need AC power. I could not find a suitable one locally (but if I was in the USA or Europe it might not have been so hard). 

I made this housing for a C7 AC socket, a fuse holder (500mA), a Hammond 266K18 transformer and a 2.5mm barrel lead to the computer. The transformer should be widely available and can work on 115V AC input if the primary is wired in parallel or 240V AC if the primary is wired in series (what I did). The secondary is wired in parallel for 9V AC @3A - plenty for any Atari 8-bit like the 400, 800 or 1200XL, especially if you have replaced some of the old components with modern equivalents that use less power.

The 2.5mm barrel connector lead is reused from a hard disk transformer that no longer worked. The tuning fork kind of connector is best of you can find one it will grip the center pin of the input jack and be much more reliable than the plain cylinder kind. You must use a fuse here as this transformer does not include a thermal fuse in the windings as some intended for plugpack use do. 500mA is suitable.

I used Prusament PETG. Supports are necessary but break away easily if you choose organic.