Uncategorized

# Circuit Fantasist

Circuit fantasist5022
Mon 2:02This is what I am actually trying to do here in SE EE but I meet fierce resistance from my peers and I am forced to do it in a hostile environment. Reactions range from passive (silence), negative (-1) to aggressive (hiding, closing, deleting and ultimately burying my questions and answers).Regarding why OPS beginners find it difficult to understand my explanations, the explanation is very simple – they do not have the attitude to think that way… Circuit fantasist5022Mon 2:24Here is just one of the latest examples – electronics.stackexchange.com/… where I have explained the behavior of a diode (in this case LED) at the lowest possible and understandable (even by a non-professional) level. The existing explanations are on a higher and more abstract level – something like “when the voltage approaches the LED threshold, the current starts to rise sharply”…The existing explanations are on a higher and abstract level – something like “when the voltage approaches the LED threshold, the current starts to rise sharply” … which is not actually an explanation but an observation. But why is the current rising? The next “explanation” is “because the IV curve rapidly changes its slope”… Circuit fantasistMon 2:35In contrast, my explanation is based on a simple but powerful concept – “dynamic resistance”. It is easy to understand (variable resistance), demonstrate (humble rheostat) and apply to any nonlinear element (diode, transistor, negative resistor…)  7 hours later… tlfong014836Mon 9:06@Circuitfantasist (1) Before I reply, I would like to suggest that we click the down arrow on left of the article we are referring.(2) One of my many reasons of visiting EESE and other forums (Yes, I have been hopping among more than a couple of forums every day), is to mend my broken English. Me on average, meet more than one new word everyday. This morning I learned a new word – “Erudition“.To learn a new word, I usually first goggle, skim a couple of dictionaries, and finally Wikipedia. Wikipedia says the following.Wiki – The word erudition came into Middle English from Latin. A scholar is erudite when instruction and reading followed by digestion and contemplation have effaced all rudeness, that is to say smoothed away all raw, untrained incivility, …

Meaning

I heard the following MIT AI Corona Virus App news from BBC Radio this morning.Artificial intelligence model detects asymptomatic Covid-19 infections through cellphone-recorded coughs
Results might provide a convenient screening tool for people who may not suspect they are infected.
Jennifer Chu | MIT News Office Publication Date:October 29, 2020

news.mit.edu/2020/…tlfong014836Mon 11:21My literature research 🙂COVID-19 Artificial Intelligence Diagnosis using only Cough Recordings – digitalreality.ieee.org
digitalreality.ieee.org/…

DOI 10.1109/OJEMB.2020.3026928, IEEE Open Journal of Engineering in Medicine and Biology (Creative Commons Attribution 4.0 License)

tlfong014836Mon 12:11Now I have assembled a poor man’s cheapy Covid-19 AI cough recorder and real-time analyser.

@Circuitfantasist “the idea behind op-amp inverting circuits, negative “resistors”, … I can share it with you …”. Ah I am only an op amp newbie. I learned op amp stuff when I studied my rusty EE diploma ages ago, but my work life since then have been all digital.I used to think that analog stuff is useless and has already been replaced by digital. But now I have a problem, I am calibrating a 100g load cell, with 0.01g accuracy. I am trying to use a 24-bit load cell amplifier, the HX711 to do the ADC. However the load cell output is of the range 0mV to 5mV, and though HX711 do handle the tiny signal, but it is slow 16sps.So I am thinking of using an op amp to amplify the signal and do some realtime processing, perhaps using JetsonNano with AI neural net stuff, to analyse the coughs of Covid-19 guys. I have only recently started the project, originally for testing a wind tunnel. But the wind tunnel project failed, so I started again, switched to Covid-19 coughing analysis, hoping to attract more “followers”.This is a recent progress report of the failed wind tunnel project, in case you are interested:

### Discussion between tlfong01 and Cem

Imported from a comment discussion on raspberrypi.stackexchang…  2 hours later… tlfong014836Mon 14:54@Circuitfantasist I am a little bit confused. (1) I know “normal resistance” is “Ohmic”, means that R = V/I is more or less a constant, or I vs V is “linear”. (2) I also know that semiconductor devices such as a diode is “non linear” or “exponential”.(3) I also know that “dynamic” is time varying. (4) I once played with NTC (Negative Temperature Coefficient (NTC), where R vs I is linear but gradient is negative. When I increases, T increases, R also increases, and I decreases (V constant, a step function or an impulse function). So NTC it is sort of dynamic, because I changes as R, T changes.My “negative resistor” electronics.stackexchange.com/… looks like this:

Now I have a couple of questions: (a) In defining or specifying you negative resistor characteristics, what are the (i) dependent, and (ii) independent variables? (b) Do you have any defining equations or graphs to illustrate your negative register idea? (c) How is your negative resistor different from the NTC resistor?  1 hour later… tlfong014836Mon 16:31I can suggest Covid19 student projects in this EE SE Q&A. I usually visit various college project site to see what is going on there. This is one of the sites I regularly watch inspire me hobbyist project ideas: Cornell University ECE5725 Spring 2018 Rpi Student Group Projects
skovira.ece.cornell.edu/…If your students are mainly doing individual and not groups, spending time shorter than a semester, or EE minor students not so experienced in ENC/MPU/SBC, you can split a big project into small parts to make it more newbie friendly. For example, for the Covid19 cough analysis project, you can split it into the following parts: (1) Cough capture, using linux audio utilities with microphones, with low resolution ADCs, such as MCP3008/3201.(2) Use Rpi4B and TensorFlow Lite to play with Google supplied classic basic test patterns such as recognizing numerical “0”, “1”, “2, … “9” etc.I have a couple of Covid19 related project ideas: Here is one:
How can Rpi read the MAX30100 / MAX30102 Oximeter? Rpi EE, 2020may01, Viewed 2k times
raspberrypi.stackexchange.com/…I have also played with air pumps, air flow meter, high torque serial bus servos (LX-224) for Covid19 related projects like this: “Coronavirus: Raspberry Pi-powered ventilator to be tested in Colombia – Zoe Thomas, BBC 2020apr13”
bbc.com/news/….Ah, jogging time. See you late this evening or tomorrow, Cheers. tlfong014836Mon 17:26Before I go, let me comment on your Q&A: Circuit Phenomena Have Dual versions – Cyril Mechkov, Technical University of Sofia, 2013jul07,

6 hours later… Circuit fantasist5022Wed 4:29Regarding Flash… I created circuit-fantasia.com in 2002 in cooperation with Poptronics (the former Popular Electronics). It had to be impressing to attract readers. Macromedia Flash was the most powerful tool for creating interactive animated stories. And really, they became (too) impressive. Now I have no idea what to do. I wonder if there is some way to convert them to something workable…Inside the site, there are ordinary HTML pages, e.g. ‘Circuit stories on the whiteboard’ (circuit-fantasia.com/…) or My students 2004 (circuit-fantasia.com/…).  5 hours later… tlfong014836Wed 9:57@Circuitfantasist Flash 2002, It had to be impressing to attract readers, … – Yes, but anybody even just mentioning the word “Flash” would be LOL’ed as a dinosaur, …For your reference:(1) Adobe Flash Player – Wikipedia
In July 2017, ***Adobe*** announced that it will end support for Flash Player on December 31, 2020,*** and continued to encourage the use of ***open HTML5*** standards in place of Flash. The announcement was coordinated with Apple, Facebook, Google, Microsoft, and Mozilla. All major web browsers plan to officially remove Adobe Flash Player on December 31, 2020, and Microsoft will be removing it from the Windows OS entirely in January via Windows Update.(2) Thoughts on Flash – Wikipedia
en.wikipedia.org/wiki/…Flash globally ending by 2020 – In July 2017, Adobe announced its intention to discontinue Flash (including security updates) altogether by the year 2020. tlfong014836Wed 10:18To attract readers, you must include the word “Covid19” everywhere, like following. 🙂FluSense, Rpi device with neural engine, listen for coughs to help identify Corvid19 and flu like symptoms – Inventors Digest, 2020nov02
inventorsdigest.com/articles/…And to attract readers, you need to tell everybody that you are zoom friendly, even your physics labs. That is why I am developing a zoom friendly version of my poorman’s Micky Mouse copycat MIT AI Covid19 Cough Sensor Experiment Kit. 🙂COVID-19 Remote Control (Zoom) Physics Lab at Your Fingertips – Harrison Tasoff, Current Science + Technology, 2020nov02
news.ucsb.edu/2020/020077/…tlfong014836Wed 10:52UC Santa Barbara’s Phy Dept guys has ***invented*** a Rpi based, 24/7, pandemic/zoom friendly, affordable, remote control lab, with stepping/servo motors, camera, 3-D printer, real potentometer knobs, …

So the students, instead of playing video games or watching YouTube at 2 in the morning, they can hop online and push a button or turn a knob for greater precision in their measurement of Planck’s constant, .. in short, more power to them. Students can propose, execute and report on a physical measurement they could perform on their own.(see full text)tlfong014836Wed 11:42Now I am thinking which Neuro machine to handle the cough data collected by the Rpi CM4. One candidate is the following cheapy US\$60 Nivida DevKit:NVIDIA Jetson Nano 2GB DevKit (Arm Cortex-A57 (Quad Core), Maxwell GPU (128 CUDA core) US\$59 – Dave Altavilla, 2020nov03
forbes.com/sites/…  1 hour later… tlfong014836Wed 13:07To attract readers, you must no longer mention the old guy Anono, which might damage your reputation. You should love the new guy Rpi CM4, or at least the growing fast STM32 Cortex M3~M0 family.(1) Raspberry Pi Compute Module 4 – Rpi, 2020oct19

(2) Raspberry Pi Compute Module 4 on sale now from \$25 – Eben Upton, 155 comments 2020oct15
raspberrypi.org/blog/…

(3) Raspberry Pi Compute Module 4 – 1GB RAM SKU 102991380 – Seeedstudio, US\$25
seeedstudio.com/…(removed)(4) Raspberry Pi Compute Module 4 Product Sheet/Documentation – Rpi, 2020oct19
raspberrypi.org/products/…(removed)(5) Raspberry Pi Compute Module 4 Pricing – raspberrypi.org
datasheets.raspberrypi.org/…  11 hours later… Circuit fantasistyst 0:44These are great miracles but simple circuit phenomena are my passion … I am currently developing my next inventor’s story only with the help of my experience, imagination, sheets of squared paper and colored fiber pens 🙂  1 day later… tlfong0148369:20@Circuitfantasist At least you should include the following news in any of your pages that has Flash.Adobe Deprecates Flash Components In Reader And Acrobat Products – Danish Ansari, RepublicWorld, 2020nov05
republicworld.com/…
Adobe has revealed that it is removing all the Flash components in its Reader and Acrobat products. The technology is set to end by the end of this year. tlfong0148369:33@Circuitfantasist You mentioned that you have IT students around you, and they might be future Elon Musk’s. So I am suggesting some college level IT projects your students might consider.I often try to recommend IEE and BCS (yes, they are old names) to my young digital makers.(1) Celebrating Future Engineers – Katie Gouskos, 2020nov04
raspberrypi.org/blog/…

(2) This is Engineering
thisisengineering.org.ukThe HX711 Covid19 Cough Sensor Project Proposal is cheap and can be done at home.(3) Digital Making at Home
raspberrypi.org/at-home/…tlfong0148369:48(4) This is Engineering – Farming Future