View Single Post
Old 9th Apr 2021, 4:04 pm   #18
ortek_service
Octode
 
ortek_service's Avatar
 
Join Date: May 2018
Location: Northampton, Northamptonshire, UK.
Posts: 1,394
Default 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.
ortek_service is offline