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Answer by periblepsis for Please help check why my opamp calculation has a...
You already know, from at least Jos and from me, that you performed your work correctly.With the advent of solvers, I exploit KCL a bit more than I once did. More equations aren't a problem, as the...
View ArticleComment by periblepsis on Count up to 23 and than reset it
If you are just looking for a counter that can drive a pair of 7-seg displays, there are various approaches. (1) use 14 FFs and transition from one state to another using standard state-table/k-map...
View ArticleComment by periblepsis on How is a BJT in the active region able to vary...
"What am I not understanding?" Most everything. There are textbooks with the word microelectronics somewhere in their titles that might help reduce what you don't know. It's a start. But to keep it...
View ArticleComment by periblepsis on What is the breakdown voltage of air (actually)?
@SimonFitch Dave Tweed has given the standard figure usually cited: "The breakdown voltage between plane parallel electrodes separated by 1 cm at standard temperature and pressure is 30 kV." That...
View ArticleComment by periblepsis on What options are there for multiplying clock pulses...
Take a look at the DCO oscillator peripheral of the MSP430. If has all you need and so much more. And cheaply.
View ArticleComment by periblepsis on Trying to understand when to use Laplace or Poisson...
A good physics book will discuss non-Coulomb electric fields. Also, rather than focusing on B, have a look at the A-field. I'm slowly learning geometric algebra (the applied side of Clifford algebra)...
View ArticleComment by periblepsis on LTSpice iteration limit reached for operating point...
Hmm. Have you tried to remove all of R2..R7 and B2..B7 and just solve it for R1 and B1? Should be simple, right? Please tell me what answer you get for V(BRANCH1).
View ArticleComment by periblepsis on What am i doing wrong? (calculations regarding...
How large of a contact area are you willing to use to lift the steel? What types of steel do you expect to lift? Do you plan to place the electromagnet flush in contact with the steel before attempting...
View ArticleComment by periblepsis on How is a BJT in the active region able to vary...
I like this explanation better than the others. +1
View ArticleComment by periblepsis on Sine to square wave circuit
@JeanB_01 I'm not even very sure what you need to know? You want to learn about these, generally? (There are much less complex circuits using opamps to get the job done.) Or are you trying to solve...
View ArticleComment by periblepsis on What is the equation for an RC snubber circuit?
You may need to write more.
View ArticleComment by periblepsis on Output Current of Darlington Amplifier
Interesting. You can just delete my comments and are willing to do so. Noted.
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Answer by periblepsis for Sine to square wave circuit
backgroundThe earlier Schmitt triggers were based on bipolar transistors. If you are curious, see my answer here where I also include many references to examine and read plus just such an early...
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Answer by periblepsis for Output Current of Darlington Amplifier
It's a numerical error due to the floating point data compression that LTspice uses, by default. If you add the following spice line to your schematic:.options plotwinsize=0Then it will fix the...
View ArticleComment by periblepsis on Constant current opto input circuit
pspeirs, Since you are working with an npn open collector output, you'd be better off using a high side current source using pnp transistors. Just flip over the design.
View ArticleComment by periblepsis on Output of TIP122 drops when connecting a load
My crystal ball doesn't work. So I can't ask it what you missed. You could, on the other hand, spend some time talking about what tests you've done and their results. I wouldn't need a crystal ball...
View ArticleComment by periblepsis on Would This Be a Good Bipolar AND Gate?
@SimonFitch It's true that when Q2 is off and Q1 input is high, that Q1's emitter will go high. But if Q2 is off to start, Q1 input then goes high, and then Q2's input goes high (turning Q2 on, now)...
View ArticleComment by periblepsis on How do I get sheet resistance from my hall sensor...
Please provide references for the bottom two images. Also, what's all this about? Is this schoolwork? Or something else? What, exactly? Include context detail.
View ArticleComment by periblepsis on Why am I measuring 1e6 ohm forward resistance on a...
Just a note and not a complaint: The question doesn't specifically state the use of a DMM. So it may be an analog meter.
View ArticleComment by periblepsis on Why am I measuring 1e6 ohm forward resistance on a...
The resistor doesn't help work anything out. Depending on the number of connections between the two sections, it could be used for measuring current. It could even be a cheap fuse (there are resistors...
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