Comment by periblepsis on How would one calculate the transconductance of the...
@TimWilliams I'm not seeing how it can be concluded from the direct information supplied in the problem. Would you please educate me, given that it is easily concluded? I'm feeling a bit like an idiot,...
View ArticleComment by periblepsis on Using 50 Ω coax cable instead of passive probe
Read the first and second answers here for starters.
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Answer by periblepsis for Why do some JFETs oscillate and others don't?
models and datasheetsThe MMBF4416A datasheet you provided is terrible. There are no charts given. Nothing to examine. However, my eye is drawn to this:If you now set this up in LTspice where...
View ArticleComment by periblepsis on Inclusion of R_E in AC and DC analysis of BJT
AC analysis requires knowing the slope of the BE junction at the operating point, which you don't show or discuss in your question. Also, the emitter capacitor, as shown completely bypassing the...
View ArticleComment by periblepsis on i am a biotechnology student. How can i make a...
I know you've referenced an article. But that doesn't mean we understand how it applies to your own thesis. Your samples may be quite different. So I just don't see how you can ask others to suggest...
View ArticleComment by periblepsis on PID controller too slow even P is changed
Show us the system diagram and what you are controlling. What kind of output does the controller have? (Voltage, current, ???) What does the device being controlled accept? What should the variable be...
View ArticleComment by periblepsis on What is the proper way to make a configurable...
Is the source impedance of 100 Ohms specified for the problem?
View ArticleComment by periblepsis on Level shift a digital 1.8V signal to split supply...
If you don't mind a boutique part, it seems you have a very good answer to your question. If you don't want a boutique part, it still seems you have a good answer as you can build that with commonly...
View ArticleComment by periblepsis on safety far visible red 740-780 nm
Safety against what? If you are talking about the eye, then my vague recollection is that a substantial part of 740-780 nm is absorbed at the retina and can cause heat-related damage. The part of it...
View ArticleComment by periblepsis on Simplest JFET front end to A/D converter
@robertbristow-johnson Just a question for now. Isn't that Digilent pmod designed to accept -10 dBV consumer audio signaling? If so, I'm not (yet) comfortable with the idea. A source follower has only...
View ArticleComment by periblepsis on Are the steps in my solution for this BJT circuit...
solve([Eq(vb/82e3+vb/24e3+ib,16/82e3),Eq((vb-0.7)/re,151*ib),Eq(150*ib,(16-6)/5.6e3)],[ib,re,vb]) gives [(1.19047619047619e-5, 1502.88641759340, 3.40161725067385)]. Many approaches with this problem.
View ArticleComment by periblepsis on About the vout of a different opamp circuit
@smartony152 Imagine the opamp sets its output to A*(pin3-pin2). Pin3 is at 3 V. Pin 2 is at 3.5 V. Suppose A=500,000!. Then the output would be 500,000*(3-3.5)=-250 kV!!! Obviously, that's not going...
View ArticleComment by periblepsis on Using lower plate/screen vacuum tube voltage
@TimWilliams To add, I didn't use the curves where the screen is tied to the plate voltage. I probably should have done do, but it would have complicated the writing and muddied the explanation. I'll...
View ArticleAnswer by periblepsis for Related to the opamp question solution (a point I...
Trying to read between the lines, I think you are wondering how \$\left(1+\frac{R_{13}}{R_{14}}\right)\$ gets removed from the \$V_x\$ term in the equation. Perhaps the confusion so far is that you...
View ArticleComment by periblepsis on How to approach the highlighted part of the question?
If they are all to be related to each other and you need to demonstrate all three (4-in, 3-in, and 2-in) then this may be how I'd approach it. It's not optimal. But it shows a common approach that can...
View ArticleComment by periblepsis on Specific, practical examples of limits of logic...
I can't tell if the question is focused on logic cells in FPGAs or if it is supposed to be a sweeping vista that goes all the way back to mechanical logic. Regardless, semiconductor based logic ... at...
View ArticleComment by periblepsis on How to connect the transformer in this three-tube...
You don't show the tubes or markings on them. But I'd guess that the transformers (or at least one of them) are for the filament voltages of the tubes. So they should be marked with the first digit...
View ArticleComment by periblepsis on How can the power of an oscillator be calculated?
Theoretical math that avoids simulation? Or simulated math that avoids theory?
View ArticleComment by periblepsis on how do you accurately measure power consumption of...
@the_circuit Assuming you are building a custom MCU board that has a fully compatible interface with your development IDE and its debugger system, then it seems only that you need to add more circuitry...
View ArticleComment by periblepsis on Find v(s) in the circuit below(voltage through the...
Have a look at my answer to a similar question. The author made a mistake in their use of Laplace. The answer I gave also deals with initial conditions such as with your question. It may help.
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