The one thing that I wan to point out regarding power supplies, is that they are 2 way devices. They can in fact create noise which makes it back into the household AC which then gets picked up elsewhere. Look at it this way:
For this reason, I think linear power supplies can be a good idea for digital devices, but so can having multiple power filters or isolated filter banks.
Try to keep all the cheap wall warts "outside" of your analog power circuits. I wrote about this somewhat here:
https://www.blogger.com/blog/post/edit/7333914575040594914/3933177263956486881
Best,
Erik
- Almost all of the noise in your AC line has been created by power supplies elsewhere.
For this reason, I think linear power supplies can be a good idea for digital devices, but so can having multiple power filters or isolated filter banks.
Try to keep all the cheap wall warts "outside" of your analog power circuits. I wrote about this somewhat here:
https://www.blogger.com/blog/post/edit/7333914575040594914/3933177263956486881
Best,
Erik