On 1/20/11 10:30 AM, will wrote:
Wait... sphere's nixie page says 170V and 33k. Is 180V 10k really
reasonable? Also, is the purpose of the anode resistor not to
decrease the voltage across the tube? Does the resistance of the tube
decrease significantly when you energize it or something?
What is a reasonable tube sustaining voltage for IN-14s? Reasonable
current?
Sorry for all the questions, this is just confusing to me.
A nixie tube is a constant voltage device, which means that the voltage
across it is nearly the same over a wide range of current values. The
current is controlled by the anode resistor. The sustaining voltage is
not something you choose. The current is, and a reasonable value is
specified in the data sheet for the tube.
http://download.elektronicastynus.be/57/in-14_datasheet.pdf
says that the maximum cathode current is 2.5 milliamperes. So you choose
a resistor that produces a 2.5 milliampere current through it when
driven by your power supply.
Also, we typically do not measure the current directly, as it is more
difficult since the meter must become part of the circuit. Instead, we
measure the voltage and we know the resistance, then divide voltage by
resistance to get current.
--
David Forbes, Tucson AZ
http://www.cathodecorner.com/
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