DIY Power Conditioner


So I have seen many posts on DIY power cords and interconnects and even amps but couldn't find anything on power conditioners.
Come to think of it...that could be a nice project...
Anyone tried it ?
ether
http://www.geocities.ws/jonrisch/surge.htm

http://mysite.verizon.net/vze22yzp/id3.html
No,but look on 10audio,make your own hydra 4 for peanuts.
there's some interesting things going on or not going on in the original hydra 4.