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Answer by periblepsis for Phase shift of a phase shifter circuit from "The...
Here's the addition of Figure 2.36:\$\quad\quad\quad\$The assumption is that \$\phi_{_1}\$ is in-phase with the input and that \$\phi_{_2}\$ exactly out-of-phase with the input, \$180^\circ\$ out of...
View ArticleComment by periblepsis on Simple AM Radio Circuit
Broadcast AM in the US is 187 m to 561 m. An optimal antenna for 630 m (not so different) might look like this (YouTube video by ham radio experts). Insane! But a lot to learn about antennas can be...
View ArticleComment by periblepsis on Circuit Analysis with Phasors and Impedances...
Well, it doesn't. On the left side, the part within parentheses does result in (excessive precision, my apologies) 21.023796 at +2.72631099 degrees. And that is about what they write. But the left side...
View ArticleComment by periblepsis on Reed Solomon Encoding FEC: what resource is the...
atod, What exactly have you used "trying to understand the math"??? You don't mention a paper or anything else. So far as I can tell, you have only just heard about the idea and feel a need to learn...
View ArticleComment by periblepsis on LDR - LED PID controller with op amps
user, There is one vague sentence and one schematic. No transfer function between the control input and the LED current, or between the LED current and the LDR resistance. You may have an optical head...
View ArticleComment by periblepsis on How to find rms value of this waveform?
I'd at least like to see your "conventional approach" that didn't work as a starting point. Otherwise, I've no idea what you tried.
View ArticleComment by periblepsis on Mistake on Stage 1 Gain Equation
Nonytg, All transistors (and I assume those modeled in the simulator) include bulk emitter, collector, and base resistances. There is also the Early Effect and details regarding \$\beta\$ variations...
View ArticleComment by periblepsis on Mistake on Stage 1 Gain Equation
@g36 !! Well. So I managed to guess the only possible problem?? What about the PNP? Does the 2N3096 (or some other PNP) have the same problem?
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Answer by periblepsis for Wye to delta transformation on square lattice
I'll start with the diagram of steps:The last one, H, will work out to \$1.5\:\Omega\$. That's easy to test out.The process is:A to B: Replace the two series pairs with their single-resistor...
View ArticleComment by periblepsis on Precision resistance measurement methods
Accuracy calibration is tricky. For temperature, the only "fairly cheap" and "kind of accurate" method is a well-mixed ice water bath using pure water (impurities can have a huge impact.) There are...
View ArticleComment by periblepsis on Base current and collector current in BJT
Agreed about the \$\text{EM}_1\$ model being the better way to see it. It's better to start right than to get cartoon ideas that will then only have to be demolished to make room, later. (Nature...
View ArticleComment by periblepsis on BJT saturation mode problem
It's really pretty easy to understand in fairly good precision if you would take the trouble to understand what a very thin base region does in the bipolar transistor. The original 1954 Ebers-Moll...
View ArticleComment by periblepsis on KVL/KCL DC and AC Node Analysis for NPN avalanche...
Your question isn't clear (to me.) One possibility that comes to mind is that you want to correctly DC bias a circuit that involves avalanching. But you seem confident in such skills. Another is that...
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Answer by periblepsis for Base current and collector current in BJT
Ebers-Moll viewI'm going to completely avoid cartoon (toy) ideas about saturation and just use the first, simple, non-linear model that was described by Ebers and Moll in 1954. It's a simple DC model...
View ArticleComment by periblepsis on BJT drive circuit - clarification needed
It's just a rule of thumb. It isn't provable through rigorous theory. You can adjust it per use. But having \$R_2\$ of some value is a good idea, just the same, to help remove stored charge in the...
View ArticleComment by periblepsis on implement multiple XOR with the minimum number of...
@minghierid I believe that the general problem of applying NAND gates to arbitrary logic is NP-complete. Aka hard. You might also examine this paper . That said, have a look at this minimization for...
View ArticleComment by periblepsis on Designing a High-Gain, High-Input-Impedance...
Emad Firoozi, I already did all the work, and much more, here. The power supply there is higher, admitted. And your supply would require redesign. But you also don't need the output stage. A little bit...
View ArticleComment by periblepsis on Precision resistance measurement methods
Have you visited either NIST or DIN to see what they do? Or contacted them to see about methods that may work within your capabilities there? They will likely be willing to help you. They'd be my first...
View ArticleComment by periblepsis on NPN/PNP Minimal component multiplexer/selector
@ThePlaneGuy45 No. I had to spend a lot of time acquiring the many various skills that go into something like this. If you are sufficiently motivated, have the time to apply, have some money to spend...
View ArticleComment by periblepsis on Up counter with 7447
So you want ripple blanking, just that you don't want the least significant digit blanked? And that this is a problem for you?
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