Re: Weir HSS100/4 PSU blowup
It does look like the audible oscillation is giving a hint that it's not very happy.
And I wonder if this is due to an overload somewhere, that you might be able to detect by measuring the AC input current / power (those energy monitors may be useful, although some aren't too accurate below a few Watts).
Hopefully you bought a few spare transistors & diodes, which it does seem to repeatedly blow the same ones after a short while.
A variac may also come in handy, to save these, if putting a light-bulb in series also stopped it blowing up (although maybe also from running due to too low input voltage?)
It may be worth checking all the non 5V output-side diodes / capacitors for being s/c, in case these could be causing an overload.
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