https://en.wikipedia.org/wiki/Velocity_factor
On Sun, Dec 27, 2020 at 10:05 PM Paul Andrews wrote:
> Hmm. My recollection from high school physics was that the speed of
> propagation along a wave guide was around 90% the speed of light -
> presumably limited by the dielectric. Signals along a
This (free) software takes PCB artworks created in inkscape and generates
manufacturing files.
https://github.com/boldport/pcbmode
Some examples here :
https://github.com/boldport/circuit-board-photos
On Sun, Jan 31, 2021 at 11:07 PM Mac Doktor wrote:
>
> On Jan 31, 2021, at 5:51 PM, Mac
He's posted a manufacturing process video
https://www.youtube.com/watch?v=pv01SKiYJz4
On Tue, Jun 8, 2021 at 2:17 PM Bill Notfaded wrote:
> And it has a QR code inside the tube!
>
> Bill
>
> On Monday, June 7, 2021 at 1:40:03 PM UTC-7 Dekatron42 wrote:
>
>> Nice!
>>
>> I really like that he
That unit on the right is amazing. What is it ? A DVM ?
On Mon, Jun 21, 2021 at 12:43 AM tntmod54321 wrote:
> absolutely gorgeous, nice finds
>
> On Sun, Jun 20, 2021 at 7:36 PM martin martin wrote:
>
>> Hello all,
>>
>> I helped a friend clean out his garage today. Some of these items have
The one to the right has a decimal point, which would suggest voltage. But
it has a lot of precision for something that old.
Maybe it's a digital readout for something like a machine tool or a
microscope positioning system ? The 'space-age' format might be appropriate
for a something like an
What's this device ? It's more like a CRT than a VFD but is it really a
magic eye ?
3 grids (or perhaps 2 grids and a shoot-through anode) seems too
complicated for just a lamp.
https://www.ebay.co.uk/itm/203331148618
>
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Electrophoresis supplies are pretty handy.
I got a smallish one by Shandon that limits at up to 400V and 100mA. It
worked a treat to fix a nixie I had with cathode poisoning.
On Tue, Jun 8, 2021 at 4:04 PM Bill Notfaded wrote:
> It's Paul Andrews I was referring to... I'm not at home right now
Big Clive mentioned these in a youtube video recently. Although the colour
is obviously due to the phosphor, he was unsure whether the gas is actually
neon. Mercury vapour would seem to be more useful to excite the phosphor
and it's hard to see an orange glow (though that may be because of the
ronics might not work at the
> lower NTSC frequency? Or is there a mechanical impediment, like the
> windings of the CRT's yoke? Thank you!
>
> Jens
>
> On 2021-04-11 7:19 p.m., Adrian Godwin wrote:
>
> It sounds a bit of a stretch - 15kHz to 19kHz. You could try running the
>
It's easy enough to extract the sync signals, as you've seen. It may not be
particularly difficult to modify the TTL input to analog, or to create a
TTL level signal if you don't need a grey-scale. On many general-purpose
monitors like that they could often be built for either standard - the
On Mon, Apr 12, 2021 at 1:34 PM Robert G. Schaffrath <
robert.schaffr...@gmail.com> wrote:
> locking on). NTSC (Never Twice the Same Color) was a bit of an issue with
> needing Color and Hue controls that adjusted the TV's
>
To complete the trio : SECAM is Something Essential Contrary to the
There's a type of nail file - actually a buffer, I think - which has a
similar very fine abrasive. There are no visible grains of abrasive and the
file appears to be a smooth pink or white (according to the grade)
material. They're sometimes used by model rail enthusiasts to clean the
track
ave a
> composite input usually (but x/y deflection setup). I am trying to build a
> luggable computer (think Osborne I).
>
> Jens
>
> On 2021-04-13 9:05 p.m., Adrian Godwin wrote:
>
> Could you use an old 'scope ? Or would it be too big ?
>
> On Tue, Apr 13, 2021 at 10:57 P
Could you use an old 'scope ? Or would it be too big ?
On Tue, Apr 13, 2021 at 10:57 PM jb-electronics
wrote:
> Hey all,
>
> I am looking for a 5"-6" monochrome CRT, preferable green or amber, with
> composite video input. If anybody has one for sale, please let me know!
>
> Best wishes
> Jens
The way I understood it, it was their whole stash of them. They wanted to
get Fran to do something cool with them rather than keep them in their
cupboard. An attitude I can well understand as my piles of coolstuff grow
ever bigger (no, I don't have any giant Nixies :)
Fran has a big interest in
for it.
On Tue, Apr 20, 2021 at 6:09 PM Nick Andrews wrote:
> Standing by for Adrian's "free to a loving home" listing of surplus cool
> stuff...
>
> On Tue, Apr 20, 2021 at 11:38 AM Adrian Godwin
> wrote:
>
>> The way I understood it, it was their whole stash of them
On Wed, Apr 21, 2021 at 12:19 AM Mac Doktor wrote:
>
>
> Yep, yep, yep. The only console video game I ever owned is a real oddball,
> Atari Breakout. It's 100% just like the actual arcade game plus some other
> modes. I say "is" because I still have it in the original box with all
> parts and
rightness issue as well as on the frequency
> modification I would be very grateful!
> Best wishes
> Jens
>
> On 2021-04-11 10:41 p.m., Adrian Godwin wrote:
>
> The line oscillator has to run close to the line frequency and is then
> phase-locked to it by the horizontal hold me
). It looks an awful lot alike NTSC
>> to me, can somebody confirm?
>>
>> Best wishes
>> Jens
>>
>>
>>
>>
>> On 2021-04-10 12:28 a.m., Adrian Godwin wrote:
>>
>> It's easy enough to extract the sync signals, as you've seen. It may
I have an old Racal-Dana counter in which the most significant digit has
areas that are dark. I'm putting this down to cathode poisoning, and want
to try restoring it.
There are some other peculiarities : that digit usually starts working
properly if I touch the anode with a DVM probe (but fails
I mean to try this on a device I'm building, but won't an H-bridge driver
do ?
It will provide an average potential of half the drive voltage giving the
ability to place a grid or anode at a small negative potential, and if the
filament requirement is less than the easy 5V it can be reduced using
Is there anybody making VFDs in small quantities ?
I'm wondering if it's possible to make the anodes and pins on PCB material
and just the grids and cathodes using the techniques from Nixies.
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To
It always surprised me that the inverted 2 is used. The cost saving must be
tiny, given that only the character itself is re-used (once it's had
supports added it's probably unique) and it's only 1 of 10 characters.
On Tue, Oct 19, 2021 at 7:36 AM Marcin Adamski
wrote:
> nah, they were the
On Sat, Dec 25, 2021 at 2:20 AM ZY wrote:
>
> Also I recall in the past when they were BatchPCB they would clean the
> board edges. They don't do that anymore, meaning I have to individually
> dremel and clean the breaking points of each pcb, which is an annoyance to
> do safely if you have a
I'm no photographer, but I have the same or similar problem trying to take
photos of LED installations. I get a dim background and overexposed leds,
consequently no colours. I think the problem is that the autoexposure
adjusts for the average level, which is correct for neither on a
high-contrast
You don't like it laced with waxed cotton ?
On Mon, Jul 19, 2021 at 12:15 PM Joe Croft wrote:
> How I love point to point wiring! PCBs can never replace the beauty of
> equipment like that!
>
> -joe
>
> On Sun, 2021-07-18 at 18:14 -0700, Instrument Resources of America wrote:
>
> For those of
Hunkin is a delight. The man's like Heath-Robinson or Rube Goldberg.
I've been a fan since his cartoon series in The Observer magazine, 'The
rudiments of wisdom'. He also has an arcade on a pier in Southwold,
Suffolk, and another in Holborn, London starring some of his amazing and
amusing
I assume it's to try to generate a panic to make you buy it rather than
scam you for multiple postages. But it often causes me to avoid them
because I want more than one, or want to come back for more if I like it.
On Tue, Jan 25, 2022 at 8:56 PM Nick Andrews wrote:
> Sellers on Amazon have
I've got a VFD clock to build sometime. It's a multidigit tube with wires
at both ends. I thought I'd extend and strengthen the wires to support the
glass by soldering them into fine brass tubing as used by modelmakers.
It'll probably turn out a mess because of all the different radii but might
be
On Sun, Apr 24, 2022 at 3:59 PM Adrian Pardini wrote:
> > Restore, then turn it into a clock (I'm thinking of something like
> Oscistudio)
>
Seconded. It would be good to have it fully working but you'll never use
it. Maybe add a PIR-based auto shutoff as was described here recently to
preserve
>
>
> On Monday, April 25, 2022 at 11:45:22 AM UTC-4 Robert G. Schaffrath wrote:
>
>> "Magic Eye" tubes are some of my earliest memories of interesting
>> displays when I was a child. My maternal grandparents had a Dumont TV
>> (didn't everyone LOL?) that used a 6AL7 eye tube for tuning the built
So it's a thermionic character-generator ROM ?
On Thu, May 12, 2022 at 4:31 PM Nicholas Stock wrote:
> It's a 'monoscope'reads off letters on the end plate...
>
> http://ed-thelen.org/comp-hist/CK1414.pdf
>
> On Thu, May 12, 2022 at 8:27 AM jb-electronics <
> webmas...@jb-electronics.de>
In the region of 30 dead ..
https://www.youtube.com/watch?v=FBeSKL9zVro=3s
On Thu, May 12, 2022 at 8:04 PM Mac Doktor wrote:
>
> On May 12, 2022, at 1:17 PM, gregebert wrote:
>
> > I was really good at processing. 8D
>
> And you survived to tell about it. Bombarding is pretty dangerous, and
I have used some of the Dymo products (not the old embossing type, though
they're popular for their retro charm). They work well if you get the
paper-based labels but the plastic labels are poor on all but plastic
surfaces. If you fold them in half to mark a wire they unfold and unstick
On Mon, Jul 25, 2022 at 11:00 PM gregebert wrote:
> Nice find. How much of the DMM seems to be working ?
>
>
It seems pretty good except for the batteries and some mechanical parts
around the stand. It's reading OK on DCV and ohms, haven't gone through all
of it.
Someone on eevblog has found me
Thanks, yes it is the right sort of thing (I actually need some with PCB
spills on both sides, though that isn't obvious from my photo). Oddly, ebay
seems to find similar ones but I can't see anything unique in the name that
specifies the form.
On Sun, Jul 24, 2022 at 2:36 PM J Forbes wrote:
>
Using DC for the filament means there is more accelerating voltage at one
end than the other and results in a noticeable difference in brightness.
I have wondered if it could be solved without a transformer by driving the
filament with a h-bridge.
On Wed, Sep 14, 2022 at 9:02 AM Richard Scales
I will be interested to see how that works out.
I have an old (aka obsolete) but fairly large resin printer, but the
materials I've used so far aren't very attractive as outer cases -
featureless grey or off-white. FDM is also poor : if you can make a feature
of the flaws, as with the shimmer
I used to work on Canon machines for my father's business in the '70s. They
were mostly 12 or 14 digit.
I wonder why they used so many digits in an era when they were so expensive
? 8 or maybe 10 seemed to be enough in the LED era.
On Mon, Oct 3, 2022 at 9:39 AM Dave ZL3FJ <2c...@silverbears.nz>
Interesting to read about these old-school suppliers.
In the UK, the supplier of all things cheap, tacky and seasonal (as well as
miscellaneous electrical the rest of the year) was Pifco, with products
usually made in Hong Kong. Did they reach other parts of the world or were
they just a brit
https://www.youtube.com/watch?v=nyYjnV99wfM
Anyone able to answer how these lamps work and why they're so unstable ?
The answer by 'Butanik' sounds plausible but IANAP (I am not a physicist).
-adrian
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Are they these bubble lights ?
https://www.youtube.com/watch?v=qTDtyFaAZy8
On Sun, Nov 20, 2022 at 1:07 PM Mike Mitchell wrote:
>
>> Terry, I remember those bubble lights at grandparents farm. I had
>> started to look into buying some many years ago, but never did...
>>
>>
>>
--
You
The examples I've read 'feel' very plagiarised. They read like those web
pages put out there to attract google hits and, thereby, accidental
advertising views - very much as thoughj ripped from wikipedia or
advertising copy. At best, I would think they pull a bunch of paragraphs
from different
I think the smaller one is a Racal
https://i.ebayimg.com/thumbs/images/g/nAsAAOSwt7FjBehE/s-l1600.jpg
The larger might be an Advance.
On Wed, Jan 18, 2023 at 7:37 PM Audrey wrote:
> I noticed these aswell, surely it's HP gear.
>
> On Wed, Jan 18, 2023, 2:20 PM Jon D. wrote:
>
>> During the
nts TF1417, the date is about correct
for it to be so.
George G6HIG Dover UK
On Wednesday, 18 January 2023, 23:35:19 GMT, Adrian Godwin <
artgod...@gmail.com> wrote:
I think the smaller of these counters is a Racal 835. Does anyone recognise
the larger one ?
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I think Dalibor is more than just a hobby and art producer. He has quite
the factory there. But there are no customers left consuming volume
quantities.
On Sun, Feb 19, 2023 at 3:08 PM Christian Riise Wagner <
c.riisewag...@gmail.com> wrote:
> From what I've read a couple of places, it seems
I agree 100kHz seems high, but I don't see any downside if you can drive
that OK. I also see no need for a filter : the only effect I can imagine is
either too low (certainly not at 100k) or possibly a beat frequency with
the multiplexing which i'd avoid carefully (or zero beat i.e. in sync, but
When I wanted a higher voltage supply to refresh some tubes, I found an
electrophoresis supply on ebay (Shandon Vokam 400-100). It provides up to
400V at 100mA with voltage/current metering and did a good job for me. I
think it cost me about £40.
On Fri, Apr 21, 2023 at 9:19 PM Benoit Tourret
I went though a series of digital scopes before I found one I was really
happy with. All were second-hand.
I had a 16500A, later upgraded to a 16500B. I didn't ever get the LAN
option. On the positive side, it's a proper logic analyser with loads of
inputs, clock and state triggering : the
I love Tim's work and have been following these recent series avidly. He
also runs an amusement arcade on a pier in Southwold, and has some machines
in a shop in Holborn, London.
His cartoons go back even further, though - I first came across him in a
cartoon series in the Observer magazine called
There is a suggestion that google are placing more and more stringent
requirements on email senders in order to push users onto a small number of
providers such as google themselves and make it more difficult to run your
own mailservers.
I did see a number of mails from mailing lists in the spam
These things are similar tech but for pixels rather than 7-segment :
https://www.youtube.com/watch?v=AclwH64eAkU
On Thu, Feb 9, 2023 at 12:06 AM gregebert wrote:
> I'm guessing that CRT-style manufacturing, where phosphor is deposited on
> the tube-face, was well-established technology in the
reproject/VFD_Clock_IV_27M_27_ESP8266_WiFi_universal_board_Right_Rev_B_c3d57047.html
>
> пятница, 9 июня 2023 г. в 20:02:31 UTC+3, Adrian Godwin:
>
>> I stash away parts for projects like that from time to time. Often not
>> very well researched and just look suitable, pending me looking more
>> carefully into t
I found your other project now,
https://www.pcbway.com/project/shareproject/W9504101AS1C172_Gerber_PCB_IV_27M_L_Rev_B_a90c6c3b.html
So I see that uses the PT6311 too.
On Fri, Jun 9, 2023 at 6:37 PM Adrian Godwin wrote:
> Thanks, yes, that's also taking advantage of the double-ended t
I think I have an unused teensy 3.6.
It may take some time to track it down but I'd happily swap it for a 4.1 if
that simplifies things for you.
On Sat, Jun 10, 2023 at 5:03 PM David Forbes wrote:
> Here is the schematic of the SCTV rev E, which uses the Teensy 4.1.
>
>
> On Sat, Jun 10, 2023
I stash away parts for projects like that from time to time. Often not very
well researched and just look suitable, pending me looking more carefully
into the project.
With that in minds, I've got a few IV-27M tubes, which interest me because
they have signal wires at both ends, and I'm imagining
Here's another approach, not really a viable retrofit to a nixie unless an
extra electrode fixed to the glass might work ?
https://youtu.be/y2_dTEXptZQ?t=227
On Tue, Dec 5, 2023 at 9:12 PM Jeff Walton wrote:
>
> Here is a closeup of the tube with a UV light source assisting... 395nM
> LEDs.
Wow.
The chessboard is epic.
On Sun, Apr 7, 2024 at 10:02 PM Mac Doktor wrote:
> https://www.etsy.com/listing/253733048/nixie-oxo-board-diy-kit-round-in-7
>
>
> Terry Bowman, KA4HJH
> "The Mac Doctor"
>
> https://www.astarcloseup.com
>
> "By the end of Chuck Statler's 'Rock Videos' of Devo we
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