> Oh on those. If you get a regular nixie supply; 170V. Make a divider out off
> 3 22K resistors, and the two voltages are 57V and 113V, which are just
> rounded off to 55V and 110V. That's assuming it was dead nuts on 170V to
> start with. Throw that 170V on a tripler and you get 510V. Again
> In the early 80's I was doing 8 mil lines & spaces, getting two traces
> between pads on .1" spacing. It was pushing the limit of the local board
> houses. It was also just the ticket for high speed memory boards for a couple
> decades, until the DDR stuff came along. Now 6 mil is considered
Either bad luck and coincidence getting three bad tubes, or THIS:
On Wednesday, August 17, 2016 at 7:56:44 AM UTC-7, Nick wrote:
>
> Either it's a mechanical issue with the socket stressing the pins to the
> extent the tube eventually becomes leaky
>
> ...or it's to do with the anode driver
OMG! That 0A5 arc discharge dekatron spinner is amazing, too!
I am ignorant as to the ways of you EE masters. But I want to make one now.
Damn you!
On Tuesday, August 16, 2016 at 5:56:58 PM UTC-4, threeneurons wrote:
>
> Well, those who know me, know that I have attraction to dekatrons.
After studying the circuit, I'm fairly certain the way it works is that
when a particular bulb fires, the other bulbs that are capacitively coupled
to it will extinguish. Neon bulbs have built-in hysteresis (firing voltage
is higher than sustaining voltage), which means that circuits can be
> Yeah. I saw the odd voltage levels too!
>
Oh on those. If you get a regular nixie supply; 170V. Make a divider out
off 3 22K resistors, and the two voltages are 57V and 113V, which are just
rounded off to 55V and 110V. That's assuming it was dead nuts on 170V to
start with. Throw that
Oh, yes, its a timing issue. It works fine with the guides detached. Its
just more of a curiosity. Flipping the guide pins does make it switch to
K1. I'll have to analyze my circuit timing more closely to discover the
actual mechanism details. The reset is issued at the same time as the flip.
I am sure you are right -- notice some of the odd angles and mixed 45/90s.
Also notice the very poor registration of the holes to pads.
In the early 80's I was doing 8 mil lines & spaces, getting two traces
between pads on .1" spacing. It was pushing the limit of the local board
houses. It was
On Wednesday, August 17, 2016 at 8:16:44 AM UTC-7, Nick wrote:
>
> Very nice!
>
> I like the discrete XOR gate but its a lot of complexity when you can get
> a single "tiny logic" XOR gate from Fairchild, Texas or whoever for $0.10 -
> one SOT-23 (as opposed to 4 diodes, 4 resistors and a
I'm certain it's a "tape-and-donuts" PCB layout. The first CAD-developed
PCB's I saw in the 1980's had telltale 45-degree bends everywhere, and
everything else was perfectly orthogonal.
Notice there are no traces going between 0.1"-spaced pads, due to the
primitive manufacturing capabilities
I think that it's a mechanical issue. Any electrical issue that over-drove
the cathodes would be visually apparent during operation -- especially at
levels that could destroy cathodes in a matter of days or weeks.
Terry
On Wednesday, August 17, 2016 at 9:56:44 AM UTC-5, Nick wrote:
>
> I'm
Very nice!
I like the discrete XOR gate but its a lot of complexity when you can get a
single "tiny logic" XOR gate from Fairchild, Texas or whoever for $0.10 -
one SOT-23 (as opposed to 4 diodes, 4 resistors and a transistor) and
you're there... :)
Yeah. I saw the odd voltage levels too!
I'm with the others - there is something about this slot which
differentiates it from the others.
Either it's a mechanical issue with the socket stressing the pins to the
extent the tube eventually becomes leaky
...or it's to do with the anode driver (the cathodes share the same drive
Sounds like a multiplexing issue to me.
I am guessing that this particular tube in question
is getting cooked for quite a bit longer than the others.
Chuck
>
>
> Original Message
>From: jwalton...@gmail.com
>To: neonixie-l@googlegroups.com
>Subject: Re: [neonixie-l] One slot on my clock
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