FYI David:
On the clock that I built with IV-11 tubes, I initially started with
an anode voltage of 60v; which is the median multiplexed voltage as per
this datasheet: http://www.tromop.eu/cms/media/IV-11%20datasheet.pdf and
a 1/6 duty cycle (16.67%). That clock was bright. Couldn't sleep in the
room with it running, way too bright. I tried lowering the anode voltage
supply to 50v, which is the minimum voltage listed in the datasheet for
multiplexed mode. This helped, but not enough; not by a long shot.
So, then I started lowering duty cycle. I can't remember how low I
eventually took it, but I soon realized that I wouldn't be able to get
the brightness as low as I needed without introducing some very
noticeable flicker. So, I moved the voltage back to 60v and the duty
cycle back to 1/6 and moved the clock to a much brighter location. Works
perfect. :) FYI, this was with the filament @ 1.5vdc. I don't know
enough about VFDs to know if lowering the filament voltage might have
helped.
I think that one of the features of Vacuum Fluorescent Display is
brightness. To paraphrase someone wiser than me: If you find yourself
thinking up more and more convoluted mechanisms for making it work, then
that's often an indicator that you're barking up the wrong tree.
-Adam
On 11/19/2013 12:48 PM, David Forbes wrote:
Also, if your VFD is too bright, you can reduce the brightness by
reducing the duty cycle, which is done by turning off the anodes on
for some time in each cycle.
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