Recent content by TJonline

Oops! Me so stupid. If those modules are terminated by a transformer, then all that can come out is pure AC. Which is not electrostatic. So, make that either a Van der Graff generator or some silk cloth rubbed on a glass rod.

What's a millenium? Lol.

I'm trying to build a DIY metal leaf or pith ball electroscope. I want to provide it with a circular arc voltage scale visible directly behind the (deflected) ends of the leaves. To calibrate the scale with ballpark accuracy, I want to determine the charge density upon the leaf pair (or pith...

Star Wars is also fused into the old clandestine harassments regime. It began as 'the art of mind control' in early casting footage. It shows a storm trooper bumping his head on a door threshold complete with sound effect (??) followed by the line 'Take over'. Did you miss it? I sure did...

, kid.

Kronig and Penney's math is quite beyond me and I'm amazed that they were so proficient with QM way back in 1930. The dilemma for me remains that in a MACROSCOPIC lattice, all N jillion atoms are NOT close, yet ALL N atoms evidently have an equal influence on the transition from discrete...

According to this Wikipedia entry: https://en.wikipedia.org/wiki/Electronic_band_structure the discrete energy levels of an isolated atom split into N levels in a macroscopic crystalline lattice (N being the number of atoms in the lattice) forming essentially continuous bands from the discrete...

According to one source, if the metal's work function is greater than the semiconductor's (its Fermi level is lesser), a (Schottky) barrier is formed with an n-type and no barrier (ohmic contact) with a p-type - the floating bubble (hole) and falling water drop (electron) analogy. If the...

eq1, do you have a good knowledge of the physics of semiconductors and the PN junction or are you speculating? I am hoping to hear from someone who knows the physics intimately. I'm talking about electrons moving to and from those bands into the attached conductors. I'm familiar with the band...

Of course charge is passed to and from the conductors. The essence of the question is whether both valence and conduction bands contribute to that current in both N and T types. Thanks.

berkeman, as a 'Mentor', are you able to allow me the privilege of continuing to edit my original post, as I'm finding that improvements are needed (in addition to your own - thanks) as I apply others' suggestions? Or is that ability not available (or desired if it tends to lead to confusion).

Thanks, eq1. this is the sort of feedback I'm looking for. I'm no authority and am coming up to speed myself. I'll study the source material you provided with great interest. Specifically, I'd like to ask you or anyone if I was correct in stating that both valence and conduction bands in...

Hi berkeman, I'm actually getting acquainted with the nitty gritty of silicon devices myself and my post was really a request for anyone to show me if I got anything really wrong in my understanding of the basic diode. But if you point me to a graph or two, I may be able to provide a little...

Unbiased circuit (no driving voltage source) ************** Fig 1 The N-type material has a tendency to donate electrons to the P-type (i.e. absorb holes from) across the PN junction via diffusion current exclusively within the conduction band of both materials. It does so after those...

Answer (to the quesiton): To help simple minded dufuses like me to try to get an intuitive understanding of complex phenomena that require brain stretching. Like: A water drop in a pool creates a wave that in turn (if big enough) may cause another particle to pop back out as an intro to...