Comment by periblepsis on How the derivative of voltage (v = Vₘ sin(ωt +φ))...
To see some of the story behind phasors, with references to source materials, I'd recommend reading the short paper, Steinmetz and the Concept of Phasor: A Forgotten Story. There you can find some of...
View ArticleComment by periblepsis on Tip for handling VCC and GND when prototyping
It would be helpful to provide more details about the circuit. Like a schematic. But given the OLED display and microcontroller and other ICs, I can understand why you are holding back a bit. In any...
View ArticleComment by periblepsis on I have designed a capacitor dropper circuit for...
Since you say you designed this, spend some time about your thinking process in developing this schematic.
View ArticleComment by periblepsis on What happens to the capacitor and inductor if net...
@M.SaaminRahman If I'm reading you well, then yes. That's a good way to put it. The idea of reactive power is for the equilibrium state, which is arrived at after some time passes. The fuller equations...
View ArticleComment by periblepsis on Electromagnet selection to propel a 50lb object...
It sounds as though you already are given a complete hardware specification and design and that this is a matter of applying software algorithms in a competition of some kind. If so, then you should be...
View ArticleComment by periblepsis on Tuning diodes and intermodulation distortion
I'm no expert -- just a hobbyist -- but while diodes are usually biased into a semi-linear region, can't they also can be driven into a non-linear region and generate intermod? Also, isn't it important...
View ArticleComment by periblepsis on Step down drive output voltage of square wave to...
You need a 1/2 amp compliant 12.5 V output with an accuracy spec of 0.16% into such a load that may, itself, vary in its required compliance current? How much variation in the compliance current can be...
View ArticleComment by periblepsis on Laplace transform; \$G(s)=\frac{1}{s+3}\$ and...
JP, In your context, what's the value of \$u\left(0^{-}\right)\$, \$u\left(0\right)\$?, and \$u\left(0^{+}\right)\$?
View ArticleComment by periblepsis on KVL Method - Currents Signs on the equation
@DarkKnight There are rules, such as the passive sign convention, and there are other rules. So long as you use logically consistent rules and apply them appropriately to a valid circuit graph with one...
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Answer by periblepsis for Use of Inductors in Low Pass Filter
I am wondering if there can be other variations to achieve this secondorder low pass filter.Sallen & Key discussed a large catalog of 2nd order active networks in their 1955 paper. Not just the one...
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Answer by periblepsis for KVL Method - Currents Signs on the equation
There are rules, such as the passive sign convention, and there are other rules (which shall remain unnamed as I don't like them.)So long as you use logically consistent rules and apply them...
View ArticleComment by periblepsis on Understanding Gas Sensor Output Voltage from...
@Mab Can you just draw the curve on a linear-log chart with the y-axis being linear and showing the output voltage and with the x-axis being logarithmic and showing the sensor resistance?
View ArticleComment by periblepsis on Dealing with an ideal current source in a BJT
Animesh, In the circuit example you provided, the value of \$V_{_\text{BE}}\$ is irrelevant to DC analysis. The current source's voltage drop will simply adjust itself to changes in \$V_{_\text{BE}}\$....
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Answer by periblepsis for Understanding Gas Sensor Output Voltage from...
your questionIt's almost impossible to guess at your professor's motivations for remaining somewhat opaque in conversations with you. If I had to throw mud at the wall as a guess, I'd say that you are...
View ArticleAnswer by periblepsis for How many volts is the potential \$V_x\$ when only...
I get:$$\begin{align*}0\:\text{V}+V_1 - R_1\cdot I_1 - R_4\cdot\left(I_1-I_2\right)&=0\:\text{V}\tag{mesh 1}\\\\0\:\text{V}- R_4\cdot\left(I_2-I_1\right)-R_2\cdot...
View ArticleComment by periblepsis on Designing a Sallen-Key Band Pass Filter
@john We really do need to know where the diagram and equations come from, if it is possible to read your notes and find that reference. What you have shown, together with the idea of Ra and Rb,...
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Answer by periblepsis for Designing a Sallen-Key Band Pass Filter
Let me expand your diagram:simulate this circuit– Schematic created using CircuitLabI don't know if this is what your notes used. But it's what came to mind when reading the equations you provided. If...
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Answer by periblepsis for Mesh analysis method
Your question could have been better with a little extra time added to improve its readability. But I may have the gist of it.I'll call your loop currents \$J_1\dots J_4\$ and accept your use of \$I\$...
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Answer by periblepsis for How to identify the terminology of Common Amplifiers?
I went through a similar process of trying to understand books teaching these same three configurations.(Also, at that time, I didn't know about single-ended vs differential modes for signalling. The...
View ArticleComment by periblepsis on What happens in a circuit when load current is very...
@Wanda Ebers-Moll predicts this. Assume Vce=0 and a Shockley current based on the BE junction as I. If BF=200 and BR=3, expect IB=(1/3+1/200)*I, IC=-I/3, and IE=-I/200. (The minus means it exits the...
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