Comment by periblepsis on Question About Utility Company Antenna...
Look up the book, "Human Interaction with Electromagnetic Fields: Computational Models in Dosimetry", by Dragan Poljak and Mario Cvetković. It's thorough, scientific theory and evidence based, factual,...
View ArticleComment by periblepsis on Dimmer circuit for LED brightness control
If the entire circuit is about just an LED and two tact switches, one marked UP and one marked DOWN, then an MCU is the overwhelmingly right answer to the problem. If you are far behind on the learning...
View ArticleComment by periblepsis on Changing the Limits of the Graph When Trying to...
@Parker Thanks for letting me know it helped. :) Appreciated. I see you can use a boost so I added +1 to your question. You'd written enough to earn it.
View ArticleComment by periblepsis on How can this Clapp JFET oscillate when its gate is...
No, L1 and C2 have about 1414 Ohms each at the indicated frequency. Where did you get the idea that their impedance is zero? It's just at a minimum with the impedance of L1 and the impedance of C2...
View ArticleComment by periblepsis on How to calcilate a differential + common mode LPF...
@AlexanderAbakumov I don't think I'd call it a Butterworth. No matter what the order is, a Butterworth always has a \$-3.0103\:\text{dB}\$ crossover frequency exactly at \$\omega_{_0}\$ and the...
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Answer by periblepsis for How much current will a BJT transistor draw through...
There are two primary viewpoints for the BJT: the DC operating point and the AC behavior around that DC operating point. You must keep these ideas totally separate in your mind. The connection between...
View ArticleAnswer by periblepsis for Why should the Vce be half the value of the supply...
It depends essentially on a few considerations:What's the available power supply voltage difference across the circuit?What's the input signal voltage range?What's the gain required? (Or, what's the...
View ArticleComment by periblepsis on Where to find/learn standard meaning of ω or φ,...
@Dale I wanted to quickly sketch out the larger map. It's vast, so you will have to use your own motivations to be selective about where to start and the directions to head in from there. Before...
View ArticleComment by periblepsis on I need a sensor setup to detect if something passes...
Mohamed, pills come in a variety of shapes and sizes and weights. The design of a such a system that can accurately allow one and only one pill to pass a gate from a container of pills includes crafted...
View ArticleComment by periblepsis on Simplification of Boolean Expression from Anant and...
Logic Friday accepted Entered: F=(A+B')(A' B'+C)+(C D)'; and gave back Minimized: F = A + B' + C' + D';.
View ArticleComment by periblepsis on Need help implementing a 16x13bit ROM
I think you are saying you want the middle rectangle circled in red found in this datasheet. This would mean parallel-out. Is that a requirement?
View ArticleComment by periblepsis on What is the purpose of the bjt in the following...
The opamp will want to have both inputs equal. On the left R1 supplies the right current so the zener sets up a known voltage. The opamp will set a voltage at the base of the bjt (with only a little...
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Answer by periblepsis for How to calculate a differential + common mode LPF...
The circuit would be more complicated to analyze if it were not symmetric. But it is symmetric. So that helps simplify a straight-forward analysis, a lot.Here's the schematic with names added. Despite...
View ArticleComment by periblepsis on What is the purpose of the BJT in this circuit?
The opamp will want to have both inputs equal. On the left R1 supplies the right current so the zener sets up a known voltage. The opamp will set a voltage at the base of the bjt (with only a little...
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Answer by periblepsis for What is the purpose of the BJT in this circuit?
This circuit was provided by university with no source unfortunately.Hmm. Okay. Let's redraw the schematic. Perhaps that will help you think about it:simulate this circuit– Schematic created using...
View ArticleComment by periblepsis on Solving complex opamp circuits
Do you know how to apply KCL in analyzing circuits? Physics classes should be continually heavy on the mathematics side. So diff-eq, through annihilators and then Laplace methods, plus linear systems...
View ArticleComment by periblepsis on Why do some JFETs oscillate and others don't?
The J309 has a lot higher beta and lambda. Both of which are related to \$g_m\$. And \$g_m\$ is very important here. Try changing the beta value to something close to the J309's. Or find a different...
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Answer by periblepsis for Solving complex opamp circuits
I've grabbed up the part you seem to be asking about and labeled an additional node.I'll be using SageMath/SymPy for the symbolic KCL analysis. It flows about like this:var('vs vbp iout r1 r2 r3 c1 c2...
View ArticleComment by periblepsis on Does anyone know the history of the SBM-20 Geiger...
Are you an historian? I designed my first Geiger counter when I was a teenager and bought my Geiger tube directly from the physicist who designed it (his home address after he and I talked a little on...
View ArticleComment by periblepsis on Zener behaving strangely
What should the exact cutoff be to prevent over-discharge? How much current compliance is required just prior to that cutoff voltage? What's the current compliance (if different) when the battery is...
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