Wow, wow, wow!!
Grahame, I think if you are varying the grid current well within the design
range and you see focus vary significantly enough to notice, you have a PSU
problem.
Either you aren't supplying the right voltage to the anode, the deflection
plates are not at the right potential (in
Hi Aaron
You've confirmed what I suspected, that the focus voltage is moving
enough to unfocus the image as the beam current is varying. I will take
some measurements of beam current, focus current, focus and cathode
voltages and try to feed the focus from a more stable voltage, perhaps
Wonderful as always!
/Martin
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To view this
love it! I always wanted to make a scope clock, but i wasnt sure what scope
looks the best, there arent any databases of scopes that would have
pictures of glowing tubes (atleast im not aware of any, if somebody knows
such a site, let me know please!)
On Tuesday, 11 December 2012 13:51:10
Great design and source of information Graham! Fantastic.
Just wondering about 1 thing, is it possible to adjust the brightness
of the scopeclock according to the ambient light? Usually you would
use the control grid of course, but what it you would adjust the
current through the filament? It
modulation of brightness.
John K.
- Original Message -
From: Michel mic...@xiac.com
To: neonixie-l neonixie-l@googlegroups.com
Sent: Wednesday, December 12, 2012 7:45 AM
Subject: [neonixie-l] Re: Sgitheach web page update
Great design and source of information Graham! Fantastic.
Just
Michel
Ambient light based brightess control is something I have been playing
with. I remember, as a nipper, we had a valve BW TV set with a LDR in
the front panel so it had a sort of automatic brightess control.
But I would certainly do the control by varying the grid voltage wrt the
