# Questions tagged [circuit-analysis]

Circuit (Network) analysis is the process of finding the voltages across, and the currents through, every component in the network.

3,219 questions
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### Analysis of this analog mux circuit

I would love an analysis of this circuit, as I suspect the mux is trying to digitally adjust the gain of the amplifier. But what is it adjusting, current gain or voltage gain? And how?
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### Why does there flows no current through the common part of the circuit?

I saw there was a post asking the same question here but I still don't understand it. I am reading the book Code: The hidden language of computer hardware and software and the book shows the ...
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### Calculate Norton equivalent in a circuit with a voltage controlled voltage source

I'm trying to solve a problem related to dependant voltage sources. I need to provide two answers which either I can't obtain or don't understand why I have obtained it. What I have done This is a ...
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### Constant current load circuit? (20 amp) [closed]

I'm pretty new to stack exchange and I've only just gotten my basic circuit analysis classes done in college. For my school's solar racing team, I've been tasked with designing a constant current load ...
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### Kirchhoff Voltage Law in a two port network

In a tutorial about h parameters of a two port network, I find the below snippet in the image unable to grasp. According to KVL, the total voltage in a loop is the algebraic sum of the individual ...
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### What will be the real voltage along the line with a voltage source and a capacitor?

Take the following circuit: If I do a simulation of this circuit I get this graph: The strange thing is that in the simulator it gives the same voltage sine wave in the circuit, near the voltage ...
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### Design a Circuit with Zero-Order Transfer function H(s) > 1

I know that if I do 2 1K ohm resistors in series, I can just do a voltage divider to get Vout/Vin = R2/(R1+R2) = 0.5. But if I want to get a transfer function of 3, what components would I use?
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### Open circuit voltage gain of JFET transistor circuit

So this is one of the questions from my previous past papers, I worked out my Vgs and Vds value correctly (-1.25v and 10v). However, when calculating my open circuit voltage gain, I use the equation ...
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### RL circuit unit impulse response

Consider this circuit. We apply a unit impulse $\delta(t)$ that is $v_{IN}(t) = 1 \delta(t)$ volt-seconds. That is, $v_{IN}$ is a unit impulse at time t = 0. Since this circuit is driven by an ...
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### Is the following op-amp-circuit-in-the-Laplace-domain analysis correct?

I am relatively new to analyze circuits in the Laplace domain. So I decided to solve some problems as an exercise. Below presented a problem and my solution to it and I have two questions: ...
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### Sine wave generator using a triangle wave input

I'm covering oscillators in my class right now and in the foot notes of my professor's notes he says that there is a "dirty and cheap" trick to generating sine waves. I replicated the circuit below ...
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### Rc ac parallel circuits:-

can someone, simply explain why does the capacitor current leads the resistor current by 90 degree in an rc ac parallel circuits, pls be simple. I thought about it but found no answer.
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### Source Conversion: Combining series current sources

I have done 1.1 and gotten 9V and 3k Ohms for the equivalent source. I am trying to do 1.2 without first converting to voltage source and I come across this situation: How would I combine the two ...
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### Finding the voltage across a inductor in a charged RLC-circuit

Well, I've the following circuit: simulate this circuit – Schematic created using CircuitLab In the circuit I want to find the voltage $\text{V}_{\text{Y}_1}\left(t\right)$ as a function ...
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### What is the purpose of using the transistor in the circuit?

Current sensor using an instrumentation amplifier: Image source: Texas Instruments INA139, INA169 High-Side Measurement Current Shunt Monitor, Typical Application Circuit (datasheet page 1) Could ...
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I was trying to solve this problem (number 27) and as per the KCL equations I am getting that an infinite number of Ammeter readings are possible. I used KCL after taking the outer loop as the ...
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### Resistor Coefficient Voltage Matrix Doesn't have a Solution

Follow the link to the circuit that I need to solve for all the resistor voltage drops. I have to make 5 linearly independent equations in order to solve for all 5 unknown voltages. Using the loops ...
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### Circuit Analysis Question

For the circuit given in Figure Q6, calculate the total current and power of the voltage supply, and the voltages V1 and V2. All resistors are of 1 kΩ I have tried applying the Kirchhoff's law like ...
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### Will love to understand how the circuit works based on this schematics [closed]

Just a pure understanding of the workability of this circuit. why 7 switches?
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### Finding the settling time of an oscillatory response

I was reading my book on circuit analysis on chapter about RLC response and became curious about how to get an approximate value for the settling time of the response. Particularly this response ...
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### What will be Resistance for maximum Power transfer from network A to network B?

simulate this circuit – Schematic created using CircuitLab Can we apply Maximum Power transfer theorem if we are given two networks both with voltage sources. In solution it was said that for ...
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### Voltage spike at the coil when opening the switch [duplicate]

I've the following circuit: simulate this circuit – Schematic created using CircuitLab In my book they stated the following sentence: After that the switch is closed for a long time, I let ...
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### Voltage exceed source voltage over a coil when opening a switch

Well, I have the following circuit: simulate this circuit – Schematic created using CircuitLab When the switch is closed for a long time, the current that is flowing trough the resistor $R_1$...
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### Dependent source while calculating Thevenin's voltage

In this case how and why while calculating the thevenin's voltage a dependent source plays a part but a resistor in its place have no contributions?
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### Feedback Circuit schematic to Control Theory block diagram?

I'm studying analog electronics circuit with feedback. I see that, during analysis, a useful abstraction over the schematic is the block diagram in control theory style, but I stuggle in deriving it ...
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### Puzzled with parallel forward biased diodes with common anode and different cathode voltages

If two identical diodes are in parallel and forward biased such that their anodes are at the same potential but their cathodes are at different potential how can we find the anode potential? As an ...
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### Increase LED Brightness

The schematic shows one row of my 16(row)x32(Col) LED matrix. Each row has 32 LEDs. I'm Scanning rows @ 1/16th rate.I'm using a PIC micro controller. I use 3V LEDs. The problem is LEDs are dim. How ...
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### Not enough current draw through MOSFET

I am trying to control the current to a Raspberry Pi using a MOSFET and an ATtiny10. I am using a logic level MOSFET and it seems that the Pi needs about 250mA to turn on but it is only able to pull ...
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### Error calculating thevenin's equivalent

I tried this method but the answer is not matching. Where it all went wrong?
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### Diodes in an op-amp feedback

Consider the following circuit: (notice the 20 diodes in the feedback loop). If I analysed this correctly, the output from the common-emitter amplifier is just the input signal but inverted and with ...
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### Detecting blast cap removal from C4 [closed]

In many Television shows (such as NCIS (all of them), Criminal Minds, MacGyver, etc.) there is a bomb consisting of electronics and C4 explosive. Mythbusters have determined that a blasting cap is ...
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### Correct methods to do source transformation

What are the conditions to check before doing a successful source transformation without any errors. Is this example correct-- The source transformed-
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### Admittance for the given circuit

I am trying to study one port networks and it requires me to calculate the admittance between two points. Kindly see the following question Part (a) is quite straightforward but part (b) is giving me ...
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### Impedance of the circuit between given points

I am trying to learn one and two port networks and the book introduced Determinants and minors to calculate the impedance of the circuit. Kindly see the following question: I have managed to do the ...
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### Removing a charged coil from circuit

I have a question: If I charge a capacitor through a resistor and remove it from the circuit, the capacitor will be charged for a certain amount of time (eventually the voltage across the capacitor ...
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### Current flow on this branch [duplicate]

What happens in this current branch? In circuit analysis how to deal with branches like this?
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### Why does the base-emitter voltage in NPN transistor become constant?

The setup above shows the experiment that I have been working with. During the experiment, the current $i_c$ and the voltage $V_{be}$ were measured for increasing $V_{in}$. At some point, the ...
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### Signal conditioning for 2SMPP-03 Pressure sensor

I am wanting to develop a circuit that accurately measures 15 Omron 2SMPP-03 sensors within its full range of -50KPA to 50KPA. Could someone give me a head start or refer me to some information on how ...
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### How do we know the direction to draw the arrows for voltage drops and current direction when drawing a circuit diagram for an ac circuit?

In an ac circuit the polarity of the voltage source changes periodically. So too will the current. However my circuit course has the voltage source labelled with a positive and negative as seen in the ...
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### Finding the current in a parallel circuit

How could we find the current that passes through each resistor in this circuit? The problem is that we don't have the voltage of each resistor to find the current, because the voltages of the ...
50 views

### Resources on Noise Circuits

Back when I was taking an RFIC design course, I was pretty disappointed by the noise part of the class, specifically calculating the output-referred noise voltage, noise figure of an amplifier, etc. ...
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### What is the contribution of dependent sources while calculating the Thevenin’s Voltage?

I was solving a problem and while calculating the Thevenin’s voltage the dependent voltage source contribution was not taken into account.Why?What important concept am I missing?
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### Finding the voltage across an inductor in a RLC circuit

Well, we have the following circuit: And I need to find the voltage at the node $\text{Y}_1$. My Work: The input voltage and current relation is given by: \frac{10}{s}=i_{in}(s)\cdot\frac{1}{\...
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### Current calculation for circuit diagram

I am new to this field and need help calculating current I2 through voltage source 2. U1=1V U2=3V R=10 Ohm Unfortunately I have no clue how to calculate this. Would be so thankful for help!
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### Best way to ground a pin when Power switch is closed?

I'm using a Particle Electron micrcontroller and powering it by connecting the battery through a power toggle switch. Since I also have a solar panel connected for battery charging, I need to GND the ...
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### Can VCC and ground be swapped on a microcontroller?

We have a Particle Electron microcontroller connected to an Adafruit RFID Shield(PN532). Somehow, the microcontroller's VUSB (+5V typical) ended up connected to the GND pin of the Shield and the ...