..or a very thin piece of copper strand left over from the milling.. have
you done a VERY close inspection of the board? (magnifier or a microscope if
available?)
Dan
-----Oprindelig meddelelse-----
From: John Rehwinkel
Sent: Sunday, June 07, 2015 8:14 PM
To: [email protected]
Subject: Re: [neonixie-l] Is /any/ kind of Nixie Multiplex-compatible?
What is off camera is a regulated lab power supply set at 180 Volts.
So, a DC supply, no multiplexing.
As you see, one of the other tubes is lit, too!
So somehow the anode voltage is capacitively coupling inside the tubes to
a nearby cathode and trough that, powering another tube.
If it's a DC supply with no multiplexing, there's no AC component, and
therefore no capacitive coupling.
What you're seeing is leakage, AKA resistive coupling. There's probably
some flux residue, dust, fingerprints, or similar on the board, providing
a high resistance leakage path, which is enough to get a partial glow like
that.
- John
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