On 2/15/11 9:28 PM, Jarek wrote:
I'm a little confused as to what current limiting resistor I should use at the anode for each digit.
The best way to find out is to test it. Assume that the ionized voltage is 140V, so you'd need to drop about 40V at 2.5mA, which is a 16K resistor. Try a 15K and measure the voltage drop across it.
I've used an allspectrum.com nixie SMPS to do the job, but from its datasheet I've noticed that it peters out at around 25mA @ 180V, less than the 37.5mA I need.
So use two of them. One powers seven digits, the other one powers the other eight digits. You know that they work.
Another question, because of space constraints, I'm going to have to keep the SMPS off-board, probably vertical to the board. The one I have linked has a 10 pin header, how long can the wires be from the board to the SMPS?
Make the HV wires as long as you want, since they have very low current and high voltage. 100 feet of 30 gauge wire would be acceptable if needed.
The primary wires should be 24 gauge wire or larger, to handle the Ampere or so of current draw.
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