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# Tunnel Diode Chat Record

tlfong01

2 hours later… Circuit fantasist5557Wed 13:56Here is an attractive movie about the “living voltage diagram” – photos.app.goo.gl/…… a very sophisticated experiment…And here is the explanatory text from the WB story above: “Software. Now let’s start a program that can visualize the voltage diagram on the screen as a “living” animation. For this purpose, the program make computer “interest” in the local voltages in three key points – the left resistor’s end point, the slider intermediate point and the right end point…… Let’s then satisfy its curiosity:) by connecting, for a start, the DAC1’s output to the ADC1’s input and the DAC2’s output to the ADC2’s input; then, connect the ADC3’s input to the slider. We can control the output voltages of the two DACs by the keyboard arrows; thus the two DACs act actually as programmable voltage sources…… The computer measures continuously the three voltages (VIN1, VIN2 and VIN3) and draws three voltage bars whose length is proportional to the voltage magnitudes. Finally, it connects them with a line representing the envelope of the voltage diagram.”Another but shorter movie of the screen: photos.app.goo.gl/…. Do you see any connection between this geometrical interpretation and the Bob Duhamel’s “video using a ruler with a lady”? Circuit fantasistWed 14:34And something very interesting in CD – electrical.codidact.com/… where I was punished with -1 instead of being rewarded for what I reported… tlfong014921@Circuitfantasist Ah yes, the short movie is good to complement the Wikibook discussion. However, there is not subtitle in words or speech with it, so that is not very helpful, comparing with Bob Duhamel.Ah, “punished with -1 instead of being rewarded for what I reported …” is good for your mental health. Haven’t you heard this lady singing? “What Doesn’t Kill You Makes you Stronger – Kelly Clarkson 2011dec14 373,573,120 views”:
youtube.com/…. Happy listening. Cheers.  2 hours later… Circuit fantasistWed 16:51Nice song…  1 hour later… tlfong01Wed 18:08And one day you think you are as strong as the bounty hunter guys, you can listen “The Danish National Symphony Orchestra”:

Now I am coming back to v2.0 of the tunnel diode I-V curve plotting proposal. tunneldiode.blogspot.com/2020/…. As I said earlier, this v2.0 hardware will use (1) 12-bit current sensor, (2) 12-bit ADC. Both toys arrived this afternoon, just in time to start playing. 🙂  3 hours later… Circuit fantasistFri 0:48I think only Edison has worked so hard… well, me too:) Here’s my new blog post and CD.  12 hours later… tlfong014921Fri 13:00I agree you can have your reason for using R1, R2 in your opAmp notation (and your “vertical bar” and “circular loop” to denote V and I).
The problem is ***consistency***: If 90% of the EE guys are using R1, R2, me newbie will definitely follow, otherwise I would not be popular among my friends, colleagues, and most importantly my students, who would have a miserable journey in their EE career. To assure easy learning curve, I strongly recommend the newbies the following tutorials: tunneldiode.blogspot.com/2020/….(see full text)  3 hours later… Circuit fantasistFri 15:35You are right about R1-R2 annotation… Very useful and systematic learning scenario… I forgot to write you that I sent you an email to share something more specific …  4 hours later… Circuit fantasistFri 19:20I have written some “black thoughts” in my reply to your last email:)  3 hours later… tlfong01Fri 22:38Ah, I have never heard of the term “black thinking”, so I googled: healthline.com/health/….And you remind me one of the world’s 50 thinkers I admire: medium.com/@preetibhonsle/….  3 hours later… Circuit fantasistSat 2:12Maybe “dark thoughts” is more correct…  9 hours later… tlfong014921Sat 10:54I am not sure how to present my tunnel diode project. So I have bee browsing forums to get some ideas. I looked at Writing.CD and Writing.SE and found them good. I am particularly keen to see how other “Test Driven Developers” do. The first couple of Q&As I read are good, including these: (1) writing.codidact.com/posts/…
(2) writing.stackexchange.com/…. So I am following some of their advice in my tunnel diode test programs.(see full text)  3 hours later… tlfong014921Sat 13:27So I have cone the MAX4172 current sensing amp SO8 to DIP8 adaptor soldering jog. It took me some 30 minutes.

tlfong014921Sat 13:58I am planning to write the story of “How does an electron slip through a Tunnel Diode?” So I am reading more posts in Writing.StackExchange. I am very surprised to find that this Writing posts also give me a very good impression as SO did some 8 years. Example: “What is the best way to learn technical writing? Asked 8 years ago, Viewed 2k times”:
writing.stackexchange.com/…. Cheers.  2 hours later… tlfong014921Sat 16:19Now I am reading MAX4172 datasheet. This reminds me why earlier I said using any answers based on opAmp is too low level. Appropriate technology is system integration of opAmp based cct.

2 hours later… Circuit fantasist5557Sat 18:38Writing was interesting for me when I was younger… Now I am mainly interested in the content and less in the form of its expression…But yesterday I was thinking about something related to this – isn’t it possible to somehow integrate text and graphics into one… let them be one thing? Because this reference from text to figure is very artificial … and the way of implementation is very different. I wonder if hieroglyphs are a more integrated way of conveying content. I don’t know, maybe you will say … This must sound very naive …In fact, I do something similar by describing a picture in words and by suggesting text in a picture …  17 hours later… tlfong014921yst 11:51Yes, your innovative idea of merging text into pictures is inspiring. One way of doing it is to hide the text behind the picture. When you click the picture, 1,000+ words would jump out explaining the picture. Below is an example showing your idea.

Now when you click the picture of the negative resistance, Wikipedia would come out explaining the “N curve”. And when you click the “superimposed I-V curve” the corresponding WikiBook would explain the colourful picture. tlfong014921yst 12:06By the way, I have been criticizing your hard to understand colourful, hand drawn, superimposing I-V curves picture. But you do inspire me to updating it to make it simple for newbies to understand. By plan is summarized below: (1) Use 4 or more MAX4172 current sense amp to measure, at the same time, four different two terminal devices (resistors, diodes etc). (2) Use one or more MPC4712 I2C built in EEPROM DAC to individually or grjoup power the diodes.(3) Use MatPlotLib to plot the superimposed colourful I-V curves, with animated images, user interaction etc.Ah, locking down lunch time! See you later.  7 hours later… Circuit fantasist5557yst 19:24Hi TL Fong,