@Circuitfantasist Sorry, I can only use free HTML5, not Flash which is NOT free. Perhaps you can convert your Flash into animated GIF, or something similar.

OK, I will try a converter but I don't know if the interactivity will stay. Anyway, write me ...

@Circuitfantasist Actually I usually think that a Yuotube video, with a couple of power point style slides, sort of a slide show, with good annotation can explain an idea well. Of course the video should be accompanied by text and still /pictures/image/short (perhaps 5 to 10 seconds) mp4 videos based tutorials, ...

I am now thinking of making such a YouTube + Text/image based tutorial. The first big subject that came to my mind is negative resistance, narrowing down to tunnel diode, further narrow down to "How to plot the I-V curve of a tunnel diode", ...

My teaching/learning plan is to start with a Schottky/flyback diode, with the classical diode IV curve and the "diode equation", explaining ideas of load lines, then move on the negative resistance, tunnel diode, plotting the curve, designing three loading lines for monstable, bistable, astable operation mode, and move on to designing a ultra high speed oscillator, comparing with Gunn diodes etc, etc, ...

I admired your Lancaster elegantly simple tunnel diode curve tracer with minimal simple components of ac mains lines 50Hz and transformer, 1k resistor, Tektronix socpe, ... My objective is to do something similar, using a triangular wave say 400kHz to do a similar. I am guessing if I use my cheaper Rigol storage scope, and adjust time base to look at the negative resistance region, ... A quick and dirty picture is shown below, ...

Now you can use animated GIF to do the animation, with in picture colour highlights, or YouTube talk show, with mp4 slow motion pictures, ... just quick and dirty thinking aloud, sorry for all the typos. Ah locking down lunch time, I need to go, see you late this evening or tomorrow. Cheers,

Ah, I forgot to show you the easy to adjust cheapy ICL8038 sig gen (with up to 450 kHz, to replace your 50Hz transformer sweep time base). I forgot if I already showed a day ago, ...

Now I have tidied up my hardware test setup. The foot print of the proto board is only of A2 size (15 x 22cm). So that in our maker's club, each two participants can sit socially distant in front of a desk and do the experiment. They can also borrow the test kit and do their covid-lab-from-home experiment.

Now about the I-V graph confusion. I very much agree with you that for two variables graph such as ours: (1) Current It is dependent variable, so should be represented as the Y-axis (ordinate), (2) Voltage Vt should be represented as the X-axis (abscissa). And as I pointed out earlier, the Vt range is too wide for Excel to draw a graph properly, So I tried to invert the X-Y graph to Y-X but the result is no good. Now I am thinking of drawing two graphs,

(a) before the Vt for Ipeak, (b) after the negative region jump over. But I have little confidence that I am doing the correct thing. So I am uploading the Excel worksheet to my GibHub site，　．．．

My GitHub site address is:

github.com/tlfong01/tunnel-diode

My GibHub's licence is MIT. So you are free to download anything there to try things out. Later I will upload my python programs of ADC MCP3008/3201/3208 for the voltage conversions of the differential voltage across the Tunnel Diode (to get It vs Vt). Then I can ask Rpi4B Thonny python to plot the IV curve, without stupidly taking any manual readings using multi-meter, and use Excel later.

Before trying the triangle wave sig gen, I am testing another tunnel diode part number 2SB4 sample #1. I happily got reasonable measurements, as shown below:

This time I did not waste my time trying to plot a complete curve using Excel, because I said earlier, the voltage range before jump over is 0~20mV, and after jump over is 486 mV ~ 500 mV, with stable increase of It around 1.88 mA. This time it is not a clear cut jump over, but can use adjust PSU to get unstable readings such as 194, 206, 221, 241, 250 mV.

Now I am randomly browsing EE SE's old Q&A in the past 7 years or so, to get a rough idea of the EE SE guys here have been discussing. As I have expected, a Q&A forum are for short questions and short answers, so no deep level knowledge and skill can be covered. One useful thing is that I can find good reference pointer. An example if the 60 year old GE manual on tunnel diode.

I skimmed the guide and I am glad to know how the engineers 60 years ago are doing R&D and enggr applications then. This is the guide and I skimming. I found the following topics useful: curve tracer, oscillation design, specification examples.