I admire the holy purity of your art, Grahame, to make a tube regulated
PSU. I'm afraid the presence in my junk box of a small mains transformer
with 200V and 24V secondaries but no suitable heater voltage led me to
stray from the path of righteousness and yield to the cheap seduction of
My tubes also came from the guy in Southampton, though I've forgotten his
name. My UV LEDs, on the other hand, came from Best Buy in Hong Kong, via
Ebay, for $28 a hundred, and I have no part number or other documentation.
Today a quick search for UV LED on Ebay returns this as the first result
LOL, there's no accounting for taste. He raised nearly $20k, and he was
only asking for $6k. What I want to know is, who the hell are these people
with the money to throw in $600 or more? Two backers over $1800? Ye gods.
Clearly, putting something on Kickstarter gets the attention of a whole
https://lh4.googleusercontent.com/-CVvQ07rOmw0/UzZ7zBoB0WI/AHc/Yz_BHkKvUmI/s1600/trig1.jpg
A few years ago - well, maybe seven - I made a trigger clock inspired by
the one on Grahame Marsh's web site. I could never get the darn thing to
work reliably in the dark - some rings would get
https://lh6.googleusercontent.com/-WtBxEUgqQjA/UzeVFdAZHPI/AHs/8MBYXpXChKU/s1600/original.jpg
https://lh6.googleusercontent.com/-VEHJNK7a-Lc/UzeVKvOwMhI/AH0/uEh_zcaOmiY/s1600/modified.jpg
I watched it today and saw it come from an hour behind to three hours ahead
in the space
Hivac used to add a little to some of their tubes - I learned this 40 years
ago from one of their RD engineers. Actually I wasn't sure if it was Kr85
or Radon, but radon has a shorter half life.
As a practical matter, when I made my trigger clock with over a hundred
Hivac XC17 trigger tubes,
Not a lot of people know this, but there's a 12 position version of those
pinball score units. They were made by Bally and used in their multiplier
slot machines for dividing by three and four. The ones I've seen didn't
have numbers printed on them so it would be easy to do 0-5 twice
On
Nitrogen glows green - it's responsible for the green-ness of the Northern
Lights. None of the other gaseous elements has a strong enough green line
in its emission spectrum. Barium and cadmium do, but they're not gases.
The only green nixie I've ever seen appears occasionally in the bottom
https://lh4.googleusercontent.com/-LS5WWI-ky2c/UpMk2OK4BrI/AEc/yf_bxteNyBE/s1600/Altoid%2BNixie1.jpg
I put this little guy together recently - I always wanted to see if it
could be done. I figure the audience here will appreciate it. It has
multiplexed IN16 tubes, driven by an
Oops, I meant the 12V comes in one end and the FET is connected to the
junction. The schematic is correct.
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On Monday, November 25, 2013 1:15:31 PM UTC-8, Michel wrote:
Is that FET not warming up too much when you drive it directly from the
AVR output?
The FET doesn't warm up at all. The only reason it would warm up is slow
turn-off time - the turn-on time is already limited by the inductor -
Sure is. A few years ago I developed a design for a cheap and easy scope
clock, based on the 3LO1 1 inch tube. I made the mistake of mentioning it
on NeoNixie, and the seller tripled the price of the tubes overnight. I
decided he could screw himself, and never made any more than the first one,
I'm not going to spit at you Ray, because I did in the end receive the kits
I ordered - but well over a year late, by which time they were no use to
me. I don't see anyone stepping up to buy the design, though. The processor
is obsolete, and some of the other parts are pretty much unobtainable
I have a mercury retort - one of these -
http://stores.rdh-prospecting.com/-strse-58/MERCURY-RETORT-GOLD-RECOVERY/Detail.bok
Mercury can be had from chemical suppliers at anywhere from $100 to
$600 a pound, depending on purity, or from prospecting stores for
about $20 a pound. 1lb is about the
These displays are only badged by Counting Instruments - they were
manufactured by IEE in California and CI was just a distributor.
Pete Sagan from the Keeney company had the idea to adopt these
displays for slot machines. From an interview, Uprights [electric
floor-standing slot machines] were
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