Eric
I've not tried UV LEDs, but I recall another design using two wire neon
bulbs(?) used UV LEDs to keep the rings going.
A lot more people on the list are more knowledgeable of the physics
involved, but my understanding is that using the photoelectric effect to
prime the tube - knock electrons off the surface to start the ionisation
process that then cascades to the tube fired, requires light photons
that exceed the work function of the metal. Therefore the higher the
frequency of the light should be better. But the other question (which
I can't answer either!) is the amount of illumination required for the
photoelectric effect to be sufficient to reliably prime the tubes.
Now I'll step aside and allow someone else to correct the physics...
Grahame
On 30/01/2013 20:47, Tidak Ada wrote:
Graham, did yo ever try UV-LED's close to the tubes ? And if so, what
wavelength is the most efficiënt ?
eric
------------------------------------------------------------------------
*From:* [email protected]
[mailto:[email protected]] *On Behalf Of *Grahame Marsh
*Sent:* woensdag 30 januari 2013 21:31
*To:* [email protected]
*Subject:* Re: [neonixie-l] Re: MTX-90 in counting circuit?
I should have added that the main problem with the XC18 is that they
don't work reliably in the dark. So overnight the clock will
sometimes crash. A fluorescent light or UV lamp keeps it running, but
that's not what I really want to do just for a clock. My trigger tube
clock is now just a demonstration clock that I fire up when required.
This makes the Z70U (or Z700U) more attractive as it has a fourth
primer electrode.
http://frank.pocnet.net/sheets/030/z/Z70U.pdf
and an application note
http://frank.pocnet.net/sheets/152/suppinfo/Z70UZ70W.pdf
I bought enough Z700U for a clock from (no connection) but not
progressed it yet (having too much fun with CRTs)
michael rotenberg [email protected]
But you might build an experimental MXT-90 ring and see how it runs in
the dark?
Grahame
On 30/01/2013 19:15, William Lee wrote:
Thanks for the reply. I'm familiar with Grahame's excellent work and
some of the Dance circuits. I just wasn't sure if I am missing
anything when considering the MXT-90s for this type of project. They
have a cathode/anode and a control electrode so I thought they would
work in a counting circuit, but I wasn't sure if I was missing
something more subtle that would make them problematic as a choice.
On Wednesday, January 30, 2013 1:55:47 PM UTC-5, threeneurons wrote:
Grahame Marsh made a whole nixie clock using them. Here's his
page on it:
http://www.sgitheach.org.uk/nixie3.html
<http://www.sgitheach.org.uk/nixie3.html>
With some "tweeking" (adjusting some part values) it should be
doable with any trigger tube. Grahame's page also references the
J.B. Dance book, where all kinds of counting techniques are covered.
On Wednesday, January 30, 2013 8:49:50 AM UTC-8, William Lee wrote:
I may be demonstrating my glaring lack of electronics
knowledge with this question, but I figure I will learn
something from it either way...
Is it possible to use MTX-90 thyratrons as trigger tubes in a
ring counter circuit to build a time keeping device with
them? My inspiration in asking this question is from other
member's designs that have been done with XC18 triggers or
neon bulbs that use mains for timing pulses across multiple
ring counting circuits.
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