nelamvr6 wrote:
seanadams Wrote:
It'll work at 5.2V but I would not recommend running it like that for an
extended time. Although SB3 does have over-voltage protection it won't
kick in until 5.5 or so.
The thing is the internal VFD supply depends on the 5V supply being
accurate in order to generate its filament voltage. If the filament
voltage is too high you may decrease lifetime/brightness of the display
- I can't say for sure what to expect.
Anyway I would not have much confidence in a 5V supply which is off by
such a margin.
That's really only 4% off. And unloaded too. Hard to say just how bad
it is without loading it.
I just measured the no-load voltage on the power supply for my SB1 at
5.3 V. That seems well within tolerance for a low-cost supply. Is the
SB2/3 power supply really so much better?
--
Bill Burns
Long Island NY USA
http://ftldesign.com
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