New isolated power supply day.
I've been messing around with a pedalboard which doesn't actually contain many pedals - Zoom B3n, Line 6 G50 wireless, Korg Volta bass synth going into the Aux on the B3n, and off-board a Roland PK5A to make the Korg Volta make sounds a bit like a Moog Taurus. However, I didn't want to have multiple power supplies, so I tried daisy-chaining them (with a polarity-reversing and size-changing lead I made up for the Volta). First power supply was too weak and weedy, got another one which had enough oomph but there was a huge amount of noise - even with just the wireless and B3n plugged in.
So I did some research on isolated power supplies, and a post in this very forum sent me towards http://stinkfoot.se/power-supplies. I wanted something cheap, small, and isolated, and preferably with a 12V output in case I want to use my little mixer rather than the B3n Aux for the Volta. Very near the end of the page, I found the Vitoos power supplies - the DC8 is partially isolated, the Iso8 says it's fully isolated, and Stinkfoot says it is (but not verified). Under £45 off That Ebay, rather than £100+. So I bought one.
It arrived today and I first took a multimeter to it. Infinite resistance between all of the pins, and also between all of the sleeves. Then I plugged it in and connected everything up, and all was quiet on the Western Front. So, for any B3n users wanting to do something similar, or indeed anyone needing to use an isolated power supply, I can say that the Vitoos Iso8 is well worth a try.