Comment 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?
View ArticleComment by periblepsis on Drawing Polar/Nyquist Plots without Calculator
@Carl Thanks. The initial insight hit me the moment I read VerbalKint's comment. Something about how he wrote it? I just figured he would write later. But after he wrote again I had to just work...
View ArticleComment by periblepsis on Drawing Polar/Nyquist Plots without Calculator
@VerbalKint You've given an important insight but haven't run with it. For example, changing the 600*s to the tangency point where the loop transitions just barely to a hook at about 948.7*s and moves...
View ArticleComment by periblepsis on Why is the following system stable in closed loop...
@needbrainscratched if that was placed in a unity NFB then it is stable (the T(s)=H(s)/(1+H(s)) case.) But if that was run open as H(s) then the double integration on a 1st order high pass suggests...
View ArticleComment by periblepsis on I want my microcontroller to read negative voltages
Spend some time describing the input source details. Not just the voltage range. For example, what's the source impedance?
View ArticleAnswer by periblepsis for How do I know the current that goes through LM317...
The actual circuit behavior involves saturation behaviors and therefore requires the full Ebers-Moll model as discussed here if you want a full description of the circuit. (Even still, that would be...
View ArticleComment by periblepsis on Use multiple ARM assembly files in a project
@FrederikJ Yes, of course. My first symbolic assembler and linker was written entirely by me in 1975. And a few since.
View ArticleComment by periblepsis on Sound Level Meters: Calibration and microphone...
I don't see how offset would make sense. I do see very clearly how gain would. I do not know the exact circumstances for calibration but if it is anything like what I did for other instrumentation...
View ArticleComment by periblepsis on Super capacitor lasting longer than expected
@MrNebula That is an important error. LEDs vary widely, one to another, even from the same batch. They are better described using the Shockley diode equation than by just one Vf number (which of course...
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