Comment by periblepsis on LEDs forward voltage at minimum brightness
Are you saying that with 170 ohms and two LEDs in series you are getting 0.15 V across the 170 Ohm resistor? And that if you use 6 kOhm in series with both LEDs that you can still see both of them,...
View ArticleComment by periblepsis on Joule thief circuit question
@abeloejmn Don't you think that the LED, having an exponential current response (flooding) compared to the applied voltage -- or alternately -- a logarithmic voltage response to the flooding current......
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Answer by periblepsis for Equivalent resistance of a network
There's a couple of ways to go when limited by your calculator.Redraw the schematic and examine it for simplifications. Reduce the number of equations needed. Solve using the solver if the remaining...
View ArticleComment by periblepsis on Proof that two systems are equivalent
Start here. Skip Lecture 1. It should only take Lecture 2. Nothing more is really needed. If you think about it.
View ArticleComment by periblepsis on DCM vs CCM Noise Spectrum
@Andr7 EMI can be worse with DCM with high peak currents and sharp switching edges. However, quasi resonant operation can really mitigate most of that problem. I don't have a bright line answer. So...
View ArticleComment by periblepsis on Thermador double oven - circuit board repair services
Not globally. Here locally there are one or two pretty good appliance repair shops that stock a lot of parts for older equipment. Wikipedia says that "Thermador is part of BSH Home Appliances...
View ArticleComment by periblepsis on Why is my 4digit 7segment display not showing all...
If this is being scanned (multiplexed) then say so. If not, there are not enough resistors there. When facing a problem, reduce it to the minimum possible to still illustrate the problem. In this case,...
View ArticleComment by periblepsis on Could not open include file "amplifier.sub"
There are directories that LTspice looks into, to find things. You may need to update that list. Names also matter. So make sure the extensions used on disk match with those used in the netlist or in...
View ArticleComment by periblepsis on Determine the transfer function for the Butterworth...
@SKevinAR18 Your fractional bandwidth (there are at least two definitions for the term, so I'll define mine here as \$\frac{f_{_\text{HI}}-f_{_\text{LO}}}{\sqrt{f_{_\text{HI}}\,\cdot \,...
View ArticleComment by periblepsis on Network analysis Kirchhoff
@Omar Can you add to your question (provide an additional edit at the end) to help me see what you are struggling over? That would help me a lot to see.
View ArticleComment by periblepsis on Three-stage CE-CE-CC Amplifier
Paul Nguyen, You really need to discuss your design process. I do like the fact that you talk about the input source sufficiently well for a simple design and that you talk about the output...
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Answer by periblepsis for Delta star transformation/ find branch current
problem conditionsAccording to the task, I have to solve it without a system ofequationsGood enough. Let's do it without solving a simultaneous system of equations.I will also avoid...
View ArticleComment by periblepsis on Output diode selection to make 50Hz stick welder DC
I'm impressed you are struggling over this. I do.MIG, TIG, and stick (SMAW) welding and love the work and over time getting better at it. But I decided to just buy the equipment than struggle over all...
View ArticleComment by periblepsis on The Electronic Electroscope breadboard is not working
There is no possible way this can be hooked up on a breadboard and work as intended. (Even assuming the schematic is well designed.) You might be able to leave some of the circuit on the solderless...
View ArticleComment by periblepsis on Driving speaker with differential driver
@dvd280 The TDA8551 is a 1 W BTL amplifier that works from 5 V. It's cheap and ancient (hopefully not retired yet.) I have piles of them here. Easy to use. And yeah. It includes a "digital volume" and...
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Answer by periblepsis for Three-stage CE-CE-CC Amplifier
The problem with very low load values, such as a speaker at \$8\:\Omega\$, is that the driver stage needs to be able to both source and sink current, actively. Your output stage, a common collector or...
View ArticleComment by periblepsis on How to solve this question by Nodal analysis?
@Vikas Looks like I can see that this came from "MADE EASY Publications". So are you self-learning? In any case, for nodal -- if that's your requirement here -- you will want to assign a ground node....
View ArticleComment by periblepsis on Software for breadboard simulation
It might be possible if you write some software. LTspice uses standard Spice syntax to define a circuit. This is in the form of simple lines of text, typically one line per part. But it allows for...
View ArticleComment by periblepsis on Multi-loop systems block reduction techniques
@NonComposMentis No. It's \$\frac{900}{s^2\,+\,6s\,+\,981}\$: ratsimp(solve(Eq(((vin-vout)*50-4*vout)*18/(s+3)*1/(s+3),vout),vout)[0]/vin)
View ArticleComment by periblepsis on LM317-N output volage lower than expected in...
@JaysonOkhman You are asking for too much out of simulation and out of parts you will get and can use in an actual design. if you expect to see an accurate value of 1.750 V then you will be needing a...
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