The 74141 or K155ID1 will both work fine for cathode side blanking,
provided that your HV supply is a normal value (180vdc). If you are
using something very high, like 250v, then you're going to start running
into the problem that the 74141/K155ID1 are not able to extinguish the
nixie. FYI, the K155ID1 has somewhat different voltage characteristics
than the 74141. I understand that the 74141 can sink something like 60v,
where the K155ID1 can sink 100v.
I think that most nixies extinguish at about 135vdc or so.
-Adam
On 3/1/2012 6:52 AM, Ron Schuster wrote:
Could you clarify something for me? Are you saying is that a 74141
should not be used for cathode-side blanking? What about the Russian
K155ID1, which I assume has similar specs to the 74141?
On Feb 28, 7:24 pm, David Forbes<[email protected]> wrote:
On 2/28/12 4:48 PM, Deviantgeek wrote:
I was looking at the Supertex drivers, mainly the HV5522. Its 220v vs
300v, would that still work? I am driving 6 IN-18 tubes. I was also
looking at the SN75468, and a few 50v drivers(TPIC6A596)which I think
is too low... I will be building several clocks, and I want good,
reliable, cheap drivers.
(this is just for the cathodes)
The voltage required depends on what sort of control you plan to use,
and how many volts you apply to the anodes. The important thing to
remember is that if one cathode is lit, then the other cathodes don't
need more than 50V to turn them off. That's why the 74141 works with its
55V Zener diode clamps on its outputs.
If you want to display one or two cathodes in every tube at all times
(no blanking, but possibly fading between numbers), then a 50V driver is
barely sufficient. Or you can use an anode driver to blank the tube. I
use the TD62083 in my Nixie watch, and it works fine.
If you want to blank the digit with the cathode, then a 100V driver
would be necessary and you'd need to use a power supply below 200V.
If you want to blank the tube and use a>200V supply, then you need a
higher voltage cathode driver or an anode blanking circuit.
I think most of the Supertex parts want 12V on their signal lines, so
they are not very easy to use since normal logic uses 5V levels.
--
David Forbes, Tucson AZ
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