Easy Build DIY Audio Mains Filters

These are here for historical reasons and some may still find them useful projects. Below are the original articles in pdf format. They are easy to make audio mains filters for your HiFi and home studio. I use them on my own HiFi system and on my Computer DAW. The first image shows the filter built inside a standard wall mount 2-way mains socket. Cost is around £25 in parts for this Whitebox filter. The 3rd image shows the RoxBurgh chassis filters mounted inside a metal case with an Earth choke. I use this on my PC DAW. Below are the original build guides in pdf format.