Science/Engineering/Technical forums

On Doug's advice, I bought a Russian type BETA-2 pancake Geiger tubes on eBay from seller annakozub. Unfortunately, these tubes are no longer available.

This tube is the kind that is shaped like a shallow disk measuring 56mm in diameter and 8mm thick. There is a thin mica window specified to be 10 ...

The light bulb oscillations only have electrons as the carrier of electric charge. However, there are two distinct modes of behaviour. One is the counter rotating oscillations first described by Holmann, the other is the charge accumulation on the wall, which serves as a floating plate to couple in ...

In my travels in the tube world, I have been particularly fascinated by the effects of retarding fields. A retarding field is formed when a negative potential slows down the path of electrons. In the context of a tube, a retarding field exists when electrons pass near an electrode that is biased at ...

Very interesting use of CRT's. Thanks for sharing.

I read the German language web pages with the google translator.

The most straight-forward way to translate is to paste the desired url into this page:
http://translate.google.com/?hl=en&tab=wT#de|en|

There is also an instant translation button ...

At least some of the nixies look like they came from equipment. Perhaps they were salvaged from the trash heap.

A few years ago I built a voltage clock and a resistance clock.

That is, the voltage clock puts out a voltage that will look like time when read by a voltmeter. For example at 12:30, 12 ...