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Old 4th April 2008, 11:16 PM   #11
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why would you put it in paralell with the tube? wouldn't that short the AC line out and cause the diode to e'splode?
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Old 4th April 2008, 11:44 PM   #12
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No, the capacitor is still in series, limiting the current. On one half-cycle, the diode conducts, and the capacitor charges. On the other half-cycle, the diode is reverse-biased, ands the capacitor discharges through the gas tube.

A surge on the power line COLUD zap the diode, so a current limiting resistor is a good idea. Of course if the diode shorts, the worst that will happen is that the bulb goes out - the capacitor still limits the current.
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Old 5th April 2008, 01:54 AM   #13
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Old 5th April 2008, 02:17 AM   #14
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Yes, that's what I tried. A resistor in series with the .47 cap is recommended. Either polarity worked for the diode - the glow concentrates at the negative termnal.

Of course the capacitor alone is simplest.
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Old 5th April 2008, 02:49 AM   #15
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a diode and a resistor isnt much more to add to it..

The AC buzz of the tube does get a little annoying so yeah..

Any way to make it brighter btw? Is the glow only on the inside of the plate or can it be on the outside too?
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Old 5th April 2008, 04:08 AM   #16
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Did you read the article I posted?
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Old 5th April 2008, 03:49 PM   #17
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like I said, a series resistor and a series diode are all that are needed.
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