[time-nuts] Favorite DC power Supply?
matt at smiffytech.com
Fri May 2 19:28:58 EDT 2008
Quoth Neon John at 2008-05-03 08:16...
> Set each one to 6 volts, hook 'em in series and use 'em to run big 12 volt
> loads. I ran a homemade true uninterruptible power supply for years using
> that lashup.
OK, whilst we're deviating from time a little, I would like to put a
time and power supply question to my learned colleagues:
I am building two GPS-driven devices, an NTP server based on an ancient
single board computer and a Nixie clock. Our power here is not what one
might call reliable - we are stuck on a spur of a very long 19kV, single
wire, earth return supply which plays up a) when there is a thunderstorm
within 200 miles and b) when it feels like it.
Whilst I could incorporate mains power supplies into both units, I like
to avoid getting mains in my constructions if I can avoid it. The SBC
has a PC-104 automotive PSU fitted and I'm building the supplies for the
Nixie clock (+5V, +12V, +170V) to operate from about 11.9V (shutdown if
less) to 15V DC.
My thought was to integrate a UPS component into the design by
connecting these to 12V 7Ah sealed lead acid batteries, which I can get
for just over $20 AUD a piece. If I were to do this, would it be
sufficient to power the units from a 13.8V supply? I believe this to be
within the voltage range for float-charging the batteries so was
guessing that this may be a simple way to provide uninterrupted power to
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