Building a class II PSU (double insulated, no safety earth) - Page 2 - diyAudio
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Old 12th January 2009, 11:38 AM   #11
AndrewT is offline AndrewT  Scotland
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My mistake.
Send me back to school.
regards Andrew T.
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Old 12th January 2009, 11:52 AM   #12
MondyT is offline MondyT  United Kingdom
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No worries my friend!

I hope the info helped

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Old 12th January 2009, 02:18 PM   #13 is offline  United Kingdom
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Originally posted by richie00boy
How about a different approach. Use an AC-DC plugtop converter which is class-II to start with, the modern switch mode ones are very compact. Then simply put additional filtering and regulation inside your equipment case.
It's nice idea. But if you want +/- supplies you need at least 2 of them. Plus the higher power one such as 120W look like they have an earth connection, so it can be limiting if you can only use the lower power models. I looked into filtering them but I thought it can cause unexpected headaches. Such as the inductors used in the filter can radiate noise into the audio circuits. Plus I'm not sure if SMPS can be completely restored to a clean voltage? And finally would feel the need to have a linear voltage reg if there is lots of CLC or CRC filtering to make a nice low impedance supply. So it would work but is much less ideal
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