Comment by periblepsis on How can a designer be sure to authorize only legit...
Allexj, The linked slide show is quite detailed about the various methods. Are you looking for reasons (ways) that these methods can be broken?
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Answer by periblepsis for How to connect the transformer in this three-tube...
I think I may have found a site that shows this schematic:There are two transformers shown, too. This may be a fit, but you will need to decide that. This is the only 3-tube schematic I could readily...
View ArticleComment by periblepsis on Determination of early voltage from the Ebers-Moll...
Are you trying to come up with circuits that demonstrate the parameter values in a simulator? Or do you want to know how to plot things on a chart, taking measurements with real devices? Or what? Also,...
View ArticleComment by periblepsis on Onkyo HT R693 worth the repair?
First off, this is a highly opinion-based question. Second, your opinion is the one that matters. You know your circumstances, wants, hopes, etc. Onkyo used to be a good brand... still may be. (I no...
View ArticleComment by periblepsis on Modifying modulation parameters in RC5
Just a question: This whole idea rests on RC5 IR communication methods developed in the '80s? You aren't allowed to choose a more energy-efficient means of wireless (non-contact) methods? I just want...
View ArticleComment by periblepsis on Opamp inverting and non inverting issue
It's unity gain stable upgraded version.
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Answer by periblepsis for Why is a push-pull transistor configuration...
Everyone has already pointed out that one of your transistors is arranged incorrectly. So I won't belabor it here. Sufficient that you know it won't work.The phrase push-pull output also relates to...
View ArticleComment by periblepsis on Why is a push-pull transistor configuration...
@Kubahasn'tforgottenMonica Yes, I knew c and d were equivalent (considered saying so, in fact, but decided against it) and am aware of the rest, as well. Except for the first point, I wouldn't have...
View ArticleComment by periblepsis on Distorted square wave
@TomCarpenter I was just about to post a comment on exactly the same point you made. In fact, I'd just caused LTspice to generate it for me. Then I saw what you wrote when scanning around to see if...
View ArticleComment by periblepsis on P2P communication: maximum range for low power &...
5 km in suburbs is hard. But Wiki has this site that lists the competing technologies you may want to consider more closely. No matter the choice (or if any will work for you), you will also need to be...
View ArticleComment by periblepsis on Bipolar 15 V DC from 9 V DC
Just a side question. Is the 9 V source an alkaline 9 V battery? (Just want to get rid of that issue, hoping it isn't true.)
View ArticleComment by periblepsis on LTspice - Beat frequency
Jess, all you will see are the two spikes with the FFT. It is showing you exactly what it should show. If you want to see your beat frequencies then take your output and run it through a diode and...
View ArticleComment by periblepsis on Why, when conductors are connected in series, their...
Vladislav, There is a very nice poster made by the two authors of my favorite undergrad physics book, Matter & Interactions. It's here. Surface charge gradients set themselves up very quickly --...
View ArticleComment by periblepsis on Transient analysis of first order circuit
@lefty The answer is always the same as far as the current direction and magnitude goes. However, if you applied a voltmeter across it as shown it would read the negation of what I wrote. If you...
View ArticleComment by periblepsis on STM32 and Fortran opinions
KaleM, Since the question about the value of your time invested recently cannot be anything but opinion, I'll provide this EEPower interview with Mike Engelhardt on QSPICE. (This YouTube link cuts off...
View ArticleComment by periblepsis on How to find the matrix layout of an old EEPC keyboard
Please document an "old EEPC keyboard". When i needed to work out the keyboard of an IBM Model 85 Electronic Typewriter so that I could turn it into a printer, I just 'scoped out the timing and...
View ArticleComment by periblepsis on A basic question about using dielectric material in...
@GNZ Watch this video. Near the very end an expert on PCB layout also makes a comment. But the video is about how reality works. It is a simple case, but applies when thinking about more complex...
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Answer by periblepsis for Why my RC-oscillator design does not produce any...
first thoughtsThe RC phase shift oscillator is often studied in a somewhat more ideal circumstance; usually using an opamp to make things a bit more idealized. Using a single bipolar transistor as the...
View ArticleComment by periblepsis on Are there any regulations that disallow simple...
I haven't recently attempted to find a wall-wart that is just a potted transformer. But I do have boxes filled with such AC/AC transformer-only wall-warts. Millions of them were made and sold. And they...
View ArticleComment by periblepsis on Question / Help with K Map and Circuit Diagram
@gauckin Glad I asked that last question. I was thinking you did everything perfectly. But I didn't know if you were writing in HDL for an FPGA or actually building something from logic ICs. Good to...
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