### Communities

tag:snake search within a tag
user:xxxx search by author id
score:0.5 posts with 0.5+ score
"snake oil" exact phrase
created:<1w created < 1 week ago
post_type:xxxx type of post
Q&A

# Posts tagged circuit-theory

Anything about circuit theory, the branch of electrical engineering concerned with the mathematical methods for representing (modeling) and analyzing lumped circuits in abstract fashion.

Although circuit theory deals with lumped-parameters circuits, some of its methods can be applied to devices or systems that cannot be analyzed properly using only a lumped-parameter model. For example S-parameters applied to microwave circuits.

As examples, some common and less common topics covered by circuit theory follow.

• Kirchhoff's laws.
• Series/parallel transformations.
• Voltage/current divider formulas.
• Nodal analysis methods.
• Mesh analysis methods.
• Star/delta transformations
• Electrical networks theorems (superimposition, Thévenin's/Norton's, Miller's, etc.)
• 2-port networks modeling: h-parameters, z-parameters, etc.
• Transfer functions theory.
• Non-linear devices modeling.
9 posts
66%
+2 −0

I thought I understood the theory of scattering parameters, smith charts etc. until I tried a practical example. The following stupid example is supposed to be a microstrip line shunted by two 100...

2 answers  ·  posted 3y ago by coquelicot‭  ·  edited 2mo ago by Lorenzo Donati‭

Question S-parameters
50%
+0 −0

If we have the transfer function of a LC high pass filter: $H(s) = \frac{sL}{sL+\frac{1}{sC}}$ If we want to find the pole of that filter in the end we get: $s = \frac{j}{\sqrt{LC}}$ and for a ...

3 answers  ·  posted 1y ago by MissMulan‭  ·  edited 2mo ago by Lorenzo Donati‭

Question circuit-theory
22%
+0 −5

Design a suitable experiment and an AC circuit to verify Thevenin's theorem when the load is a single-phase induction motor with a capacitive start and two supplies feed the load. Ratings of load:...

0 answers  ·  posted 1y ago by dkumar94600‭  ·  edited 2mo ago by Lorenzo Donati‭

Question Thevenin-theorem
66%
+2 −0

posted 2y ago by Circuit fantasist‭  ·  edited 2mo ago by Lorenzo Donati‭

Article Ohm-law
71%
+3 −0

This application note from Linear Technology discusses oscillations in opamp circuits and some compensation schemes. One method discussed for reducing phase shifts in the loop gain due to the RC ne...

1 answer  ·  posted 3y ago by rpm_2718‭  ·  edited 2mo ago by Lorenzo Donati‭

Question feedback
71%
+3 −0

I am calculating the base current of transistor Q1. To simplify the circuit equations, I applied the Thévenin's theorem twice and converted V1, R1 and R2 into Vth and Rth, as shown in the image. ...

2 answers  ·  posted 1y ago by kadamrohan16‭  ·  edited 2mo ago by Lorenzo Donati‭

Question Thevenin-theorem
28%
+0 −3

The thermal stability coefficient is defined to be: $S = \frac{dI_{C}}{dI_{CBO}}$ where $I_{CBO}$ is the reverse current of the BJT when voltage isnt applied to the base of the BJT. In case of a ...

0 answers  ·  posted 11mo ago by MissMulan‭  ·  closed 2mo ago by Nick Alexeev‭

Question feedback
50%
+0 −0

I am trying to find the AC analysis of a BJT Hartley oscillator but I cannot continue. How do I find the voltage gain? When no feedback is there, we just find the output resistance and the current...

1 answer  ·  posted 1y ago by MissMulan‭  ·  edited 1y ago by MissMulan‭

Question feedback
28%
+0 −3

I have this circuit: I think that R3 acts like a feedback path from the output to the input.However I am not sure what will happen if I change the value from 100Ohms to lets say 1kOhms. I have ...

2 answers  ·  posted 2y ago by MissMulan‭  ·  last activity 2y ago by LvW‭

Question feedback