Comment 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.
View ArticleComment by periblepsis on Calculating the instantaneous power of an ideal...
marco, you already have all the math verification needed. The main question you ask can be answered qualitatively. Let's say the capacitor and the source is at t=0. Then the capacitor voltage is +1.5...
View ArticleComment by periblepsis on How to vary the quantity of charge on a steel tube...
@seanlogan I'm less interested in the setup here and more curious about what you are attempting to investigate. Much has happened since the 1959 paper. I particularly liked the approach taken by...
View ArticleComment by periblepsis on Overcurrent circuit
I'm interpreting your writing as saying that the error signal is outgoing only and that resumption is automatic and that a computer isn't required for resumption. In that case, there have been many...
View ArticleComment by periblepsis on How should KCL be applied to this circuit when two...
@jonathanjo Years ago in the US when I was teaching there was EE, CE, and CS as degree programs (well, CE was just being developed then.) CE was kind of like a hybrid of EE and CS with a stronger focus...
View ArticleComment by periblepsis on Where to learn about the step by step working of...
@Frederik In this case, it was a semi-read/skim because I already knew the material and was looking for something that a motivated teenager or young adult could use to get a leg up on the essential...
View ArticleComment by periblepsis on Looking for a way to do a discrete level shifter
What does the 0-3 V input control look like, exactly? What's its impedance? Can I assume you have very low impedance access to all of ground, 3 V, 12 V and -5 V? How is the load wired?
View ArticleComment by periblepsis on LCD display degradation during storage
Are you considering buying an old stock item from someone and can't directly verify functionality yourself? Perhaps for a retro console or DIY? What's motivating the question?
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