Comment by periblepsis on Some questions involving RADAR, antennae, and...
user697763, Optical light is one the order of magnitude of about a micron. 60 GHz radar is about 5 mm, 10000 times longer than green light. So the size of the resolved features should be about 10000...
View ArticleComment by periblepsis on Quartz Digital Wristwatch synced Wirelessly
Arno, I worked with the team producing this watch. (Which tells you where I live.) I still have my pre-production watch as well as a final edition of it here. It actually did run 2 years on a battery,...
View ArticleComment by periblepsis on Why isn't a megger lethal?
@Lundin Agreed. It's not the static shock. But the kinetic energy that follows. ;)
View ArticleComment by periblepsis on Some questions involving RADAR, antennae, and...
I don't know, but you made me curious since there are non-principle axes of rotation. I think Toutatis is one such. How does this complicate the situation? I am suddenly curious.
View ArticleComment by periblepsis on Estimating Stability of linear current soure
None of this leads to a quantitative design. More, you start with the assumption that near DC H(s) is 1 and dominates and that with s R2 C2 included and towards HF beta(s) is also 1. Or, if I'm...
View ArticleComment by periblepsis on Estimating Stability of linear current soure
The LED is a white Luxeon Emitter for 350 mA with VF between 2.79 V and 3.99 V (typ of 3.42 V) and a dynamic resistance at the operating point of 1 Ohm (typical) and at least a 2:1 spread over samples...
View ArticleComment by periblepsis on Estimating Stability of linear current soure
Junius, they don't have to be designed by trial and error. There is a process to follow. Are you interested in that particular circuit with that particular opamp and that particular LED? Do you want a...
View ArticleComment by periblepsis on Gilbert cell not working
Did you build this from discretes? Or did you use one of the several available ICs with matched transistors? (The MAT14, for example?) There is the power hungry and expensive AD831. There's also LT5526...
View ArticleComment by periblepsis on Selection of the resistor in the hysteresis...
@Ig_M At least twice the power (obviously the average and not instantaneous.) So 5 W would be about right if 1.75 W is the worst case "average over some desired time" value. But you do also need to...
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Answer by periblepsis for What's wrong with this phase shift oscillator?
The first thing that struck me about your circuit is the lack of sufficient gain. Ideally, the gain must have a magnitude of at least 56. Ideally. A little more won't hurt.Let's test this ideal...
View ArticleComment by periblepsis on What is the circuit theory explanation for...
@zzzpotter One thing that isn't clearly spelled out in your question's linked YouTube site is that they are focused on delta and wye commercial configurations and not on north american split phase. The...
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Answer by periblepsis for Why does a changing voltage appear to pass through...
What I'm really looking for is a physicalandintuitive understandingof what's happening inside the capacitor and why a change in voltageon one plate causes the voltage on the other plate to...
View ArticleComment by periblepsis on Slimy residue and corrosion at copper-to-steel...
@DaveTweed Probably introduced by allowing AI to write their code for them. ;)
View ArticleAnswer by periblepsis for When calculating the relationship between the...
Ampere-turns: The ampere-turns of the primary must equal the ampere-turns of the secondary.The secondary has two parts and given the unbalanced load the ampere turns of half the secondary will be...
View ArticleComment by periblepsis on How to properly choose resistor values in emitter...
@FrederikJ Which parts of it can you fathom? Any part of it? Or complete blank? I'm not sure how to reply, not knowing how you would process this. Obviously, you say that you've thought about it for a...
View ArticleComment by periblepsis on Need help understanding the step-by-step derivation...
Renáta (1) Nortonize the 6 V and 20 Ohm series branch to parallel 0.3 A and 20 Ohm; (2) add the 0.3 A to the existing 0.3 A to get 0.6 A in parallel to step (1)'s 20 Ohm; (3) Thevenize the 0.6A and 20...
View ArticleComment by periblepsis on Why am I getting "undefined" on Logisim?
Please add a little to how you created the full adder in your circuit. Did you use the Project/Add Circuit method? Also, have you tried just testing the subcircuit by itself? You've dumped a lot of...
View ArticleComment by periblepsis on Colpitts oscillator doesn't work
@Benzen11 Try putting a series 220 Ohm resistor going between your 6.7 V supply and the R1+R3 shared node. Then tie a 100 nF to ground from that shared node, as well. (You have some, it seems.) See if...
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Answer by periblepsis for Using emitter follower to supply +5 V, and less...
The circuit cannot be achieved without including a known load!\$5\:\text{V}\$ output and no more than a \$5\%\$ droop at a \$25\:\text{mA}\$ load.One may read this as meaning \$5\:\text{V}\$unloaded...
View ArticleComment by periblepsis on 100% charged or shallow dischardge/recharge cycles
@rantash68 How exactly would you stop the charger, assuming you wanted to? That's not clear to me.
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