Electronics > Projects, Designs, and Technical Stuff

Is this power supply regarded safe?

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CuriousAbe:
So I came across this DIY drum machine project on a different forum I frequent. Was about to order one but something struck me about the power supply. I dont know if it's just me but would this psu be  deemed safe or not in terms of clearance between live and neutral etc?

I mean I wouldn't want somebody poking about all willy nilly since its on the same board as the drum machine itself and really close to the rest of the components.

Asked a member who built one last week for some photos and additional information:




magic:
I have no idea what are recommended or legally required clearances between line and neutral. But what really makes me nervous here is the proximity of mains wiring to what appears to be low voltage ground and signal traces, probably directly or indirectly connected to some I/O jacks and UI controls the user will touch :scared:

I would bypass that PCB and run mains cable far away from it straight to the fuse and transformer.

CuriousAbe:

--- Quote from: magic on March 19, 2019, 10:30:37 pm ---I have no idea what are recommended or legally required clearances between line and neutral. But what really makes me nervous here is the proximity of mains wiring to what appears to be low voltage ground and signal traces, probably directly or indirectly connected to some I/O jacks and UI controls the user will touch :scared:

I would bypass that PCB and run mains cable far away from it straight to the fuse and transformer.

--- End quote ---

Good point! Looking at the pictures again the PSU part of the pcb (top section to the red) only seems to serve for mains input voltage selection :bullshit:

TimNJ:
In my experience, typical clearance between line and neutral before the fuse should be 4mm or greater. Clearance after the fuse should be 2.5mm or greater. Just rule of thumb though. Depends on contamination level, etc. For a sealed unit, you can get away with less. If there's dust/dirt or if the board isn't de-fluxed properly, you should have more clearance.

bd139:
I've seen worse on old HP/Harrison power supplies !

To note I probably wouldn't use that section of the board and just wire the transformer to the correct voltage permanently.

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