Actually, brightness is a needed feature when this displays are used as
intended. They were designed and are still used with heavy optical filters
in front, to enhance contrast and visually eliminate the tube mechanical
internal structure from the users view.
We of course like to see the tube na
If there is one thing I like it is an answer like that :)
I tried to request three samples of the supertex drivers, we'll see if they
grant me some.
Thank you all for the comments, suggestions and solutions up to this point.
I got more (practical) answers here in less than 24 hours than two we
> Does anyone know whether it is a bad idea to go below the recommended
> multiplexing voltage as mentioned in Adams comment??
It won't damage the VFD or anything, but it slows down the electrons, so you
could get ghosting while multiplexing. I'm guessing the numbers in the
datasheet are to pr
Mine run from 18v low brightness to 35v for full brightness for the last 3
years and have had no issues.
Sent from my iPhone
> On Nov 19, 2013, at 4:16 PM, Gideon Wackers
> wrote:
>
> Does anyone know whether it is a bad idea to go below the recommended
> multiplexing voltage as mentioned i
Does anyone know whether it is a bad idea to go below the recommended
multiplexing voltage as mentioned in Adams comment??
Op dinsdag 19 november 2013 23:01:33 UTC+1 schreef Adam Jacobs:
>
> FYI David:
>On the clock that I built with IV-11 tubes, I initially started with
> an anode voltage
I'm going to make three clocks (Christmas presents for girlfriend, brother
and sister), but I'll see if I can get samples approved with my university
email. Thank you for your generous offer to send me some samples but I'll
first try to get my own samples at a reasonable price.
Op dinsdag 19
Hi Gideon,
How many of these clocks are you planning to build? If it is just a
few, then I wouldn't sweat the costs too much. Both of those companies
(used to be - I assume still) are very generous with samples. I agree
that the Supertex and Maxim parts can be difficult to obtain for a low
p
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
I was typing the previous reply while you posted it, that clears some
things up.
You mention tweaking the value, is there a way to actually calculate it?
(I'm not that much into transistor calculations as you may have noticed)
Op dinsdag 19 november 2013 22:06:16 UTC+1 schreef jrehwin:
>
> > I
http://i.imgur.com/CFTb8gI.png
is this what you mean?
Eagle was being weird today so I had to draw it in lochmaster
Why is that better than the original two ideas? I would like to understand
everything :)
Op dinsdag 19 november 2013 21:48:18 UTC+1 schreef nixiebunny:
>
> On 11/19/2013 1:36 PM,
> I'd use the more traditional design with a resistor in series with the base
> of the NPN transistor driven by the CPU, rather than the emitter resistor as
> you showed.
David has a point - the disadvantage is it uses one more resistor, the (large)
advantage is the functions are now separated
On 11/19/2013 1:36 PM, John Rehwinkel wrote:
I want to build a four digit VFD clock (three of them actually) without using
drivers like the max6921. I have two possibilities at this moment, one is this
http://i.imgur.com/D4FGaV1.jpg
and the other being this one http://i.imgur.com/5fMc7ty.png .
Thank you very much for this reply, I'll just order a few values and see
what works.
But I am missing one thing to complete the story; why are current values
given in the datasheet if there is no need for current regulation? or
should those be seen as normal values that you will see during ope
> So now I only have to figure out wether my two transistor driver is a good
> way to drive my IV-11 tubes :)
I was hoping someone more versed in the intricacies of transistors would
address this, but they haven't, so I'll take a stab at it.
> I want to build a four digit VFD clock (three of th
I know the difference between a nixie and a VFD tube but I have to say that
your explanation is very nice to summarize all the loose bits of
information in my head.
So If I have a 6 volt supply for my four filaments (in series) I would not
need a resistor. I think the 7806 won't get that warm
Hi Gideon,
I think that you have some confusion regarding how VFDs are driven. VFDs
are not nixie tubes or anything even similar. Nixies are not vacuum
tubes, they are cold-cathode (neon) tubes. With nixies, we place ~180vdc
across the anode & cathode via a current-limiting resistor. The reaso
I want to build a four digit VFD clock (three of them actually) without
using drivers like the max6921. I have two possibilities at this moment,
one is this http://i.imgur.com/D4FGaV1.jpg and the other being this
one http://i.imgur.com/5fMc7ty.png . Which would be best?
Another question is the
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