Charles Link's latest activity

I think the potentiometer might be a ballast resistor (in series with the supply voltage and plasma material) with a resistance that can...

I happen to own one such ball where a potentiometer varies one parameter (voltage?) through a sliding potentiometer. In this video the...

We lost a great member. I will miss him.

I'm more familiar with arc lamps running at higher currents and low voltages. When they operate at high voltage, the currents will be...

Guys, we should vote Phinds to legendary status. He is a legend and will truly be missed.

Unless we see some data from the manufacturer for a particular bulb, I don't know that we have a good handle on the voltage, current...

A photo of a snowman and Charles Link (left).

The above is a photo of a 4'0" snowman that I made today, New Year's Eve 2025, in Chicago. We had about a half inch of snow, but...

It's the end of the year and once again I wish to thank the mentors and admins for their stedfast commitment to the PF cause and for...

Thank you for the update Robert, and I'm very sorry for the loss to you and your family. Paul was an amazing member here, with many...

damn. this is hard to hear. @phinds was just a loved and core member for 15 years. Thank you so much for taking a bit of time to let us...

Good afternoon, This is not Paul, but rather his son Robert. I am very sad to write here that my dad passed away on Saturday...

Just an additional comment or two: What you @Orthoceras are asking seems simple in a way, but plasma physics can get very complicated...

The orange of neon, and the blue of argon/xenon, are fluorescence colors. De-excitation occurs in a sequence of smaller energy steps...