I haven't
been into a BA23 PSU, so this is a question, not a
suggestion - does that PSU have a separate "jumper" plug for
50Hz/60Hz switch?
SInce the first thing an SMPSU does with the mians is rectify
and
smooth it, it's not going to care about the mains frequency.
Um, not quite. If it's designed barely-sufficient, a lower mains
frequency (eg, 50Hz when it's designed for 60) may cause output voltage
sags as the filtering dips below what the regulation can handle during
the non-peak portion of the mains cycle.
To get all nitpicky and pedantic, not relevant to "reasonable use"....
This also applies, even more so, to extremely low frequency, such as
running it on 0.25Hz power. And running it on very high-frequency
power (I'm thinking up in the MHz) is likely to cause trouble with the
effective inductance of parts that have ignorably low inductance at
normal mains frequencies. Feed it close to the chopper frequency and
it might even be possible to throw the thing into oscillation.
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