Never believe it shall reach the specified vacuum. That's an optimum ever
reached under lab circumstances !
Its build to move air, not to maintain vacuum. These pumps have membrane
valves, that will never close tightly the are intended for flow, not vacuum.
Read the 7th review written by 'Dave'
Also, should I try making my own, by using wire and styrofoam? (would
let me Do LED, and give the tubes some freedom to move.)
I think you should - this group is all about trying things out, learning, and
sharing our experiences.
- John
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Or you could use my scan of the schematic David posted :)
http://www.selectric.org/nixie/ticlock.gif
On 18 Jan, 03:47, mike logan...@gmail.com wrote:
could you show me a simple schematic for it
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neonixie-l
On 12-01-17 11:15 PM, mike wrote:
here is one cheep
http://www.harborfreight.com/a-c-manifold-gauge-set-92649.html
There are vacuum gauges and then there are VACUUM GAUGES.
Those are for Auto Air conditioning where they want to get 99% of the
air out. To make a Nixie, I think you have to
Take care of clocks using the mains as a timebase like the ones
posted, they are for 60hz, ok in the us, but wouldnt be any good here
in the uk.
If you go for a crystal timebase then make sure you get the right
crystal, they come in series and parallel flavours, parallel seems
more popular, some
On 1/18/12 11:07 AM, dr pepper wrote:
Take care of clocks using the mains as a timebase like the ones
posted, they are for 60hz, ok in the us, but wouldnt be any good here
in the uk.
You just need to change the first 7492 frequency divider chip to a 7490,
then it will work at 50 Hz.
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I guess that the additional question would be: How stable is the mains
frequency in the UK? We use it in the US because it is very stable.. I
understand that in the former soviet union, the mains frequency was
terrible. Whenever I open up old soviet clocks they always have a
crystal in them
I guess that the additional question would be: How stable is the mains
frequency in the UK?
Its supposed to be stable and analogue clocks driven from the mains
were once the norm in public buildings. I would use it as a time base.
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I'm still experimenting with different techniques, but wanted to post an
update. I picked up a 6volt transformer just to play with. I may not use
it in an actual clock circuit, but I hooked up 3 IV-11 filaments in series
and dropped a diode into the start of the circuit. I powered the
From the National Grid (Who supply/transmit our electricity) System
frequency will therefore vary around the 50 Hz target and National
Grid has statutory obligations to maintain the frequency within +/-
0.5Hz around this level. However, National Grid normally operates
within more stringent
I have been trying to get this circuit to work for a few days and it
is driving me nuts!
I'm trying to make an array of tricolor LEDs (RBG with common
cathode). The goal is to use 5v logic to turn on MPSA92 and light up
the array.I have 4 LEDs with three anode resistos (one for each
color). I'm
On 1/18/12 9:29 PM, Thomas K. wrote:
I have been trying to get this circuit to work for a few days and it
is driving me nuts!
I'm trying to make an array of tricolor LEDs (RBG with common
cathode). The goal is to use 5v logic to turn on MPSA92 and light up
the array.I have 4 LEDs with three
Try connecting the anode of the led to +12v through a resistor, then
connect the cathode of the led to the emmiter of the pnp tranny, then
connect the collector to ground, a logic zero on the base of the
tranny through a 10k resistor should light up the led, you need also
to connect a diode like a
To get that to work properly you'd need to trannys, one pnp connected
to the led and an npn switching ground to the base of the pnp, a trick
I've used on nixie clocks to switch high temsion to common anodes.
On 19 Jan, 04:39, David Forbes dfor...@dakotacom.net wrote:
On 1/18/12 9:29 PM, Thomas
On Jan 17, 11:41 pm, Joseph Bento jos...@kirtland.com wrote:
I came across my stash of four 1TS1A display tubes, purchased more
than a year ago. They are still waiting for a project. I guess these
really must be somewhat rare due to the scarcity of any information,
and lack of any datasheet.
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