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 notice it much), but they will last 6x as long as
standard direct driven tubes.
-Adam
On 2/27/2012 4:39 AM, dr pepper wrote:
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/
On 27 Feb, 12:06, Cobra007<[email protected]> wrote:
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 the time for example (they won't turn
completely off).
If blinking is required in any of the 3 designs that I just showed,
the transistors cannot be replaced with the SN75468. I didn't mean to
say all of them are dangerous designs, I only say they all use a DC
voltage above 300V.
Just so you know for the future, Geert is the son of the sites author
(Ronald Dekker), who works for Philips as is extremely well known
here.
Thanks for letting me know, I am sure he will understand what my
remark was about.
Michel
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