This thread has moved well away from technical content to personal
attacks - its now closed.
Move along to the next thread please!
On Feb 27, 9:11 pm, Cobra007 wrote:
> > Michel tries to shoot holes in the advice from David Forbes
> > to have a look at the SN75468 as an alternative for MPSA42's
> Michel tries to shoot holes in the advice from David Forbes
> to have a look at the SN75468 as an alternative for MPSA42's.
> Unfortunately, Michel seems not to notice that most of the
> time he talks out of his arse. Luckily, there are folks pointing
> out to him there is room for improvement. I
ndeed, that is
pointing out errors and helping each other. Have to admit
we're a fine group, don't you agree? ;-)
Cheers, Frank
-Oorspronkelijk bericht-
From: Lucky
Sent: Monday, February 27, 2012 8:03 PM
To: neonixie-l
Subject: [neonixie-l] Re: Important Lesson Learned Today...
I agree. I also take some exception to the idea that using rectified
mains is somehow horrifically dangerous and never done in modern times.
There's nothing wrong with an unisolated HV supply, provided that the
case is designed in such a way that no part of the design can come in
contact with a
Wow, slow down chaps, must be a highly talented thing all this having
a dig.
All Michel said (in response to a comment "For future reference, the
TI SN75468 has seven MPSA42s in it") was "They are not exactly the
same, standard MPSA42s are 300V while as the SN75468 is only
100V." (which is true) th
You can also write a monitoring thread into your program. A little
defensive coding can go a long way here. Another option is to not drive
your nixies at more current than they are supposed to receive when
direct-driven, that is what I do. Sure, the nixies are a little dimmer
(although I don't
You can protect against crashed programs from toasting tubes, at least
with the pic micro by using the watchdog timer, carashes can be
detected and dealt with.
For real expensive tubes you could add a capacitor resistor missing
pulse detector to power down the ht if the multiplex anode switches
die
No no, the issue was that it was stated that 7 transistors MPSA42 with
a 300 Vceo could be replaced by 1 IC SN75468 with a 100 Vceo.
The only thing I remarked was that this is only possible if the used
voltage is not too high (not over 250V) because otherwise you couldn't
blink the nixies to set t
On Feb 27, 11:21 am, Cobra007 wrote:
> In short,
>
> Take a look at Geert's clock here:http://www.dos4ever.com/geert/geert.html
>
> Now, I do not know Geert but it seems to me he knows quite well what
> he is doing. Check the HV power supply he uses for his clock and
> estimate what the DC voltage
In short,
Take a look at Geert's clock here:
http://www.dos4ever.com/geert/geert.html
Now, I do not know Geert but it seems to me he knows quite well what
he is doing. Check the HV power supply he uses for his clock and
estimate what the DC voltage will be.
Or else, how about this one?
http://ww
On Feb 27, 10:42 am, Cobra007 wrote:
> I don't know how many clocks will run over 180V but I did read
> somewhere that some people just take the rectified mains power and use
> that to drive the nixies.
Nobody in their right mind has used rectified mains for nixies for a
long long time. There are
Hello Frank,
I don't know how many clocks will run over 180V but I did read
somewhere that some people just take the rectified mains power and use
that to drive the nixies. I wouldn't recommend doing that, but
apparently some people choose simplicity over safety. Now I don't know
in which part of
Few things perhaps. It is not very common that nixies
are powered with _more_ than 180V. Of cource you can
wonder what happens if you use 300V, or 1000V, or...
And do we really need to connect pin 9 of the SN75468
to a 100V zener? Who suggested that?
BTW, any news on your nixiewatch project? D
That is a nice module you got there!
I don't want to spend too much time on this and definitely not act as
if I know everything better, but your circuit is powered by 170V which
means the mentioned problem wouldn't be there.
I draw a small circuit here:
http://xiac.com/Images/Nixie300V.GIF
The o
Page 17 shows the voltages on cathode "6" of an IN12 vs all the other
cathodes being driven:
http://www.tayloredge.com/storefront/SmartNixie/DataSheets/Datasheet_SmartNixie.pdf
The other cathodes capacitively couple to each other but the driven
cathode gets nearly all of the current. You will s
On Feb 25, 9:39 pm, Cobra007 wrote:
> Don't you think they might turn on?
No
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>
> Not so - the cathode drivers only see about 60-80V due to the drop in
> the nixies when on - think about it! There is no need at all to use
> anything over 100V Vceo
>
> Nick
Hi Nick,
Yes that is true, but what if the nixies are not on?
Suppose the tubes blink when setting the time?
The anod
On Feb 25, 12:43 pm, Cobra007 wrote:
> They are not exactly the same, standard MPSA42s are 300V while as the
> SN75468 is only 100V.
>
> I think this could be a problem if voltages over 250V are used to
> power the nixies.
Not so - the cathode drivers only see about 60-80V due to the drop in
the
They are not exactly the same, standard MPSA42s are 300V while as the
SN75468 is only 100V.
I think this could be a problem if voltages over 250V are used to
power the nixies.
Michel
On Feb 25, 4:58 pm, David Forbes wrote:
> On 2/24/12 10:38 PM, Spencer wrote:
>
> > So I have learned today
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