# Questions tagged [circuit-analysis]

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

5,281 questions
Filter by
Sorted by
Tagged with
59 views

### Question 4.56 from Nilsson and Riedel 8Ed Mesh Analysis

I need to solve this problem using meshes. I had no problem doing it by nodes but when I try to do it by meshes it doesn't match with the final answers. It asks the power from the 10 V source. From ...
113 views

### Thévenin's theorem exercise

I tried to do an exercise from my textbook where I have to apply the Thevenin theorem, but can't solve it. I got stuck at one point. Given the circuit in the picture find the V0, Vth and Rth. I tried ...
71 views

### Solving circuit equations for a Wheatstone bridge with diode in the middle

Consider the following diagram : Assuming that the diode is an ideal one, the goal is to solve the circuit equations that will determine the voltage and current of the circuit with R=7k ohm I was ...
245 views

### How did the authors arrive at the answer?

I am reading the book "Fundamentals of Electric Circuits 6th Ed." by Sadiku and Alexander and one of the practice problems (Practice Problem 3.7) I did not get right. The 4A current source ...
65 views

### Calculate total resistance. (Circuit analysis)

How do I solve this circuit and determine the total resistance between A and B if all the resistors are 120 Ω? Thank you.
58 views

### Why is voltage subtracted in this 2-resistor circuit to find the current?

I am figuring out the current for the following circuit: Using V = IR, I would expect to do I = V / R and then do: I = (20 + 50)...
119 views

### Carry-select adder - Time calculation

a) Suppose a binary pick-up adder (carry-select) of 32-bits, comprising 4 sub-sections adders spreading carry of range 8 bits. Show the values ​​obtained internally in the circuit of this adder to ...
142 views

### Calculate capacitance given I and V graphs

There's this question which asked us to find the capacitance value give both (v-t) and (i-t) graphs for capacitor. Here are the graphs: This is how I calculated the capacitance: It was obvious from ...
126 views

### How do I solve this simple circuit using Kirchoff's Laws?

I am a freshman taking up Electronics Engineering and I am brushing up my skills in doing some simple circuit analysis problems. However, I've come across this quite simple problem and my answer is ...
81 views

### What is the target of this circuit? Power diodes and

I'm working on a PCB design where I need to add a TPS65987 USB-C controller. I'm using the TPS65987 EVM schematics to add to my design but there are some circuit parts than I don't understand. In the ...
142 views

### How to choose NPN or PNP for the second stage of an amplfier?

How would you choose NPN or PNP for the second stage amplifier like the one below? What are the advantages and disadvantages of them? I see that both NPN and PNP can do the job. I understand that they'...
607 views

### Why does analysis indicate that ground lifts do not fix ground loops?

Note: "Ground loop" in this question refers to a ground loop caused by linked magnetic fields. (Sometimes ground loop refers to slightly different scenarios.) Recently I've been looking into ...
87 views

### How I obtain the differential equations of this LC connections

I have this LC connections with three nodes vc1,vl2,vc3 and this notes equations. C_{{1}}{\frac {d}{dt}}v_{{{\it c1}}} \left( t \right) -{\frac {\int \! v_{{{\it l2}}} \left( t \right) {dt}}{L_{{2}}}...
71 views

### Using current division to find voltage

I'm a beginner in electrical engineering. I am having trouble with this circuit analysis problem. It asks to simplify the circuit into an expression for $V_L$ in terms of $R, R_L,$ and $i_S$. ...
106 views

### I am lost on this circuit analysis question, can someone help me understand how to set it up? [closed]

I do not even begin to know how to solve it, I am in my first circuit analysis course and struggling to understand the material, I just know I need to make equations using KCL, and then use those ...
59 views

61 views

### How I can probe and place some wires/probes on that chip?

I have the following chip: And I want to analyze it without desoldering. The chip "legs" are not the long one where you can plase some cables with temporary soldering. Also I do not want to ...
642 views

### Russian к2лн641 VFD (Vacuum Fluorescent Display) driver pin out help

I have recently acquired some IV-3 VFDs (Vacuum Fluorescent Displays) and they came on an old PCB with drivers. The driver is a к2лн641 and have found a datasheet on it with some information, but it ...
33 views

### Is this set up to measure CMRR correct?

Is this set up to measure CMRR correct? Why did he not consider $V_{out}/2$ in his derivation? Also is there any reason to use plus-minus sign ± for the gain? ...
3k views

### For this Art of Electronics circuit, why aren't the transistors specified? And what transistors do I use?

If I were going to EE school, then there would be a lot of knowledge transferred just by going through all of the usual things -- labs, homework, exams, etc. In teaching myself, it's so hard when they ...
169 views

### What's the effect of the resistance added to the non-inverting input?

I'm trying to figure the effect of adding a resistance at the non-inverting input of a inverting amplifier. simulate this circuit – Schematic created using CircuitLab How can introduce it in ...
109 views

### Big confusion about the very fundamentals of circuit analysis

First, let's call IR3 the current flowing from A to B, IR4 the current flowing from B to C, IR5 the current flowing from C to (-V2). What's the proof that IR3>0, IR4>0 and IR5>0? I know this ...
50 views

### Low-side active clamp forward converters with synchronous rectification

I'd like to analyse the active clamp forward circuit, and I read the paper which called Analysis and Implementation of Low-side Active Clamp Forward Converters with Synchronous Rectification Does ...
154 views

### Soft-start for MOSFET doesn't work as expected

I need a soft-start circuit for an electronic load to avoid sparks at the input terminals when a power source is connected (in this example when SW1 is closed). Below circuit diagram is working fine ...
84 views

### What kind of RC filter is this?

For an ADC(ADS52J90) the datasheet suggests this filter as a high-pass filter for the input of the converter, but I did not managed to understand this filter. Is it a high-pass filter? Is it used ...
63 views

### Can I run 2 relays in parallel for dry/wet contacts?

I have 2 separate relays that are getting 24VAC signals to open/close a NO contact. The end device (FAN) has 2 terminals that give out 24VAC (SS CMD, wet contact). When SS CMD contacts are jumped/...
141 views

### Are the transistors in this 8x8x8 LED cube design doing what I think they're doing?

I'm advising a friend on building an 8x8x8 monochrome LED cube. He found this popular design, but I feel like there's a lot of room for improvement. One area in particular is this array of NPN BJTs ...
163 views

### Exact name of this circuit (schematic) of an LC oscillator. Is this one of the synchronous LC oscillators?

I've been searching for the exact name of the below circuit. I only that the below circuit is an LC oscillator circuit. Can anyone tell me what it is, and tricks for searching the exact names of ...
87 views

### how does the differential equation for a series RC circuit behave?

I am analyzing a simple series RC circuit. I have the equation that describes the current set up but I don’t understand it. In the picture below, wouldn’t the di/dt term be 0 instantly because of the ...
53 views

### Modelling of current flow in a plate or plane

Is there an FEA technique for modelling current flow in an irregularly shaped conductor, other than by applying nodal (or mesh) analysis? I want to create a model of the current flowing in a PCB that ...
65 views

### Silicon Controlled Switch Problem [closed]

Can someone correct me and help me draw this SCS circuit diagram for a breadboard before I do the actual circuit? I tried using Multisim but since I'm new to it, it was hard for me to do so.
147 views

### Q: Homework - Past exam solution Is this the right solution?

I am trying to find Vo but I am not sure If this solution right? Is there a shorter path to find Vo? solution
37 views

### Circuit with LEDs, SW520D switch and TP4056

I'm willing to reproduce (and modify a bit) a French YouTuber's project. (Here is the video) Except that I want to get rid of the ATtiny. It's a circuit with 2 LEDs powered by a battery. The circuit ...