Activity for tlfong01
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Comment | Post #279402 |
@Olin Lathrop， Thank your very much for your advice. Cheers. (more) |
— | about 4 years ago |
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— | about 4 years ago |
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Post edited: start a new Appendix on tunnel diode curve tracer design using ICL8038 v0.1 |
— | about 4 years ago |
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Post edited: added sig gen references |
— | about 4 years ago |
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Post edited: Edited the title |
— | about 4 years ago |
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— | about 4 years ago |
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Post edited: Added I-V measurements and a plot |
— | about 4 years ago |
| Comment | Post #278462 |
@Olin Lathrop, so you have told me something that I didn't know that I didn't know. I never noticed the name "***body diode***" until perhaps a couple of weeks ago. I wrongly thought that that the diode is a ***flyback diode***, and the purpose of showing it in the schematic is to let the user sleep ... (more) |
— | about 4 years ago |
| Comment | Post #279413 |
I randomly browsed your other answers for more interesting new ideas. One thing that caught my eyes is your answer about using MOSFET as a voltage follower, to replace op amps. I am now thinking of using an op amp in my tunnel diode testing circuit, but I have very little experience and I only know... (more) |
— | about 4 years ago |
| Comment | Post #279413 |
@TonyStewart, Many thanks for you answer, which inspires me to learn more things. I have never heard of Falstad Simulator. So I will google and wiki. And as I mentioned in the beginning sections of my question, I confessed that I don't clearly know what actually is a load line. I never designed a loa... (more) |
— | about 4 years ago |
| Edit | Post #279402 |
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— | about 4 years ago |
| Comment | Post #279405 |
(2) About using Op Amp for stability and low internal source, resolution, current limiting, etc - I am glad to let you know that I agree with everything you said. This test setup design is a long story, so let me give more details in the next comments. / to continue, ... (more) |
— | about 4 years ago |
| Comment | Post #279405 |
@Olin Lathrop, many thanks for your advice. (1) About this TLDR question - I agree that my question is too long. One way to shorten it is to summarize all the long paragraphs into a 2,000 words article, with perhaps 10 pictures and move it from Q&A section to the post/paper section, IF I finally arri... (more) |
— | about 4 years ago |
| Edit | Post #279402 |
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| Edit | Post #279402 | Initial revision | — | about 4 years ago |
| Question | — |
How to plot the I-V curve of a tunnel diode? I am trying to understand tunnel diodes by experimenting with them. Research tells me they can have negative resistance, and can be used to build a high frequency oscillator. Tunnel diodes are supposed to have this I/V characteristic: Image I don't really understand negative resistance, so I ... (more) |
— | about 4 years ago |
| Comment | Post #278933 |
That is way I mentioned that you are diverting often, and you mind is hopping randomly around. If you are giving a lecture in class, I think there is no problem, because your students can raise their hand ask you to clarify, or ask classmate sitting next to clarify. But as a paper in the Q&A/forum/pa... (more) |
— | about 4 years ago |
| Comment | Post #278933 |
@Circuit fantasist, OK. So I understand your "Battery backup voltage regulator". I also agree with you saying that your students understand you story. However, there is a big problem. I think most first time readers won't understand you story for at least two reasons: (1) You are using misleading na... (more) |
— | about 4 years ago |
| Comment | Post #279016 |
Now what I don't agree: (5) I don't agree with the following: "I converted the light to voltage by an op-amp circuit." (You need something called a “photo diode”.) (6) I don't agree that any imaginary invention story should be told or published before verification by results. (more) |
— | about 4 years ago |
| Comment | Post #279016 |
I am back. It took me about 15 minutes (yes, I am using my kitchen timer. :)) (1) I think I understand every schematic very well. (2) I think I understand every sentence very well. (3) I think I understand the invention objective very well (When I learned photography ages ago, I did have a light mete... (more) |
— | about 4 years ago |
| Comment | Post #279016 |
Yes, I very much agree with @Olin Lathrop that the schematics except Fig 7 is unthinkable, at least for me IQ97. Let me quickly read the story once and see it can improve my IQ a bit. (more) |
— | about 4 years ago |
| Comment | Post #278933 |
@Circuit fantasist, Thank you for your clarification. So (1) Bin is not a battery, but an unregulated power supply consists of (a) AC transformer, stepping down AC mains from say 200VAC to 12VAC, (b) Bridge rectifier to convert 12V AC to 12V DC, (c) a big decoupling capacitor, perhaps? (2) Bb, on the... (more) |
— | about 4 years ago |
| Comment | Post #278933 |
@Circuit fantasist, ***Most power is wasted in the transistor.***. This is another confusion. I thought you said that Bin is replaced by Bb. So the current goes first to R, before to the transistor. In other words, power is wasted in both R and transistor. If your final version does NOT show Bin but ... (more) |
— | about 4 years ago |
| Comment | Post #278933 |
(1) It is strange why others keep silence - I don't feel strange because I understand you and the EE SE Q&A situation better. (2) When I asked about the backward biased diode inside the battery, you ***diverted*** to bridge rectifier. It appears that you mind is hopping randomly, ... (3) When I worr... (more) |
— | about 4 years ago |
| Comment | Post #278933 |
Thank your for your clarification. Your answer seems to have added one more confusion: "Usually, the return current can not enter Bin since there are backward biased diodes inside it...". What do you mean by "***backward diodes inside the "battery"***? (more) |
— | about 4 years ago |
| Comment | Post #278933 |
@Circuit fantasist, no hurry and no problem at all. Actually I forgot most of the regulated power supply I learned ages ago. But I still remember at that time I used a NPN BJT called 2N3055 to step down voltage and of course wasted a lot of energy, in this "linear" regulator power supply. Your batt... (more) |
— | about 4 years ago |
| Comment | Post #278836 |
/ continue from above, ... (2) In NTC, Resistance is the dependent variable; Current and/or Temperature are the dependent variables. Now for your "true negative resistor"what are your dependent and independent variables? (more) |
— | about 4 years ago |
| Comment | Post #278836 |
@Circuit fantasist, I can barely follow your a bit confused explanation. There is one thing I got stuck: (1) In last paragraph of Section 4, you mentioned "***true negative resistance*** (VNIC converters) by adding a multiplied voltage. This is a great idea... the Miller's idea." Can you briefly des... (more) |
— | about 4 years ago |
| Comment | Post #278933 |
@Circuit fantasist, I can barely follow your story. There are some confusions: (1) What exactly is the thing labeled "Bb"? If in your final schematic, is it true that there is no longer any Bin, and is now moved to Bb? (2) Your circuit seems to work, but there is one big problem: The load current no... (more) |
— | about 4 years ago |