Questions tagged [circuit-analysis]

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

Filter by
Sorted by
Tagged with
1
vote
1answer
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 ...
1
vote
1answer
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 ...
2
votes
1answer
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 ...
1
vote
3answers
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 ...
-2
votes
1answer
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.
1
vote
1answer
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)...
1
vote
0answers
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 ...
-1
votes
2answers
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 ...
2
votes
2answers
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 ...
0
votes
1answer
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 ...
0
votes
1answer
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'...
8
votes
4answers
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 ...
0
votes
3answers
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}}}...
1
vote
2answers
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\$. ...
-3
votes
1answer
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 ...
0
votes
1answer
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 ...
4
votes
2answers
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 ...
0
votes
0answers
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? ...
10
votes
4answers
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 ...
2
votes
3answers
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 ...
-2
votes
1answer
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 ...
0
votes
0answers
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 ...
2
votes
3answers
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 ...
0
votes
1answer
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 ...
0
votes
1answer
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/...
0
votes
4answers
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 ...
1
vote
3answers
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 ...
1
vote
2answers
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 ...
1
vote
1answer
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 ...
0
votes
2answers
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.
5
votes
1answer
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
0
votes
1answer
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 ...
4
votes
4answers
326 views

How to generate a complex sinusoidal signal on a function generator?

I can't relate some of the equations or mathematical expressions commonly seen on circuit analysis textbooks to the real world. For instance, if I'm given an input signal mathematically expressed as \$...
0
votes
2answers
64 views

Miller Theorem circuit rappresentation

From the Miller Theorem: simulate this circuit – Schematic created using CircuitLab I feel strange that \$i_a\$ and \$i_b\$ are opposite and enter at the different extremes of the Z impedance. ...
1
vote
1answer
57 views

Trouble analyzing biasing circuit

I'm having trouble analyzing this biasing circuit. It's supposed to shift Vin up by 1.4 V, and everything works when I simulate it, but I can't get anything out of the manual analysis. I know that ...
1
vote
2answers
138 views

How to analyze low pass filter in voltage divider?

In some guitar pedals I've seen following circuit to provide a stable voltage between ground and the supply voltage (labelled as INPUT below). I think this forms a ...
1
vote
3answers
122 views

555 timer Bistable circuit not working as suggested, bad circuit?

I'm using an app to explore different 555 timer uses and getting my head around the logic. The app states that this circuit will flip-flop the two LED's on each press of the button, but I can't see ...
0
votes
0answers
55 views

How is the transmission matrix A calculated?

I have this 2-port net simulate this circuit – Schematic created using CircuitLab I need to calculate the net transmission matrix A by using the cascade connection of the single blocks. So I ...
-2
votes
1answer
76 views

Xl4015 5A for 2s 18650 as charger

I have a xl4015 5A with only voltage adjuster. Can I use it for charging 2 series and 2 parallel 18650 cells? I saw a circuit diagram but in that diagram the xl4015 has variable current adjuster. It ...
0
votes
0answers
68 views

MOSFET diode configuration expression for dynamic bias

I'm trying to think of an elegant way of analytically expressing the gate voltage as a function of time \$V_g(t)\$ (= \$V_d(t)\$) for the diode configured MOSFET below. The sources VDD and V1 are ...
3
votes
4answers
652 views

PNP and NPN circuit resistor values

I'd like to know what would be the best resistor values for R5,R6,R7 at the PNP and NPN transistors, if I want to use the circuit below. Assume the LEDs Vf =2V at 20mA. Will the circuit values I have ...
0
votes
2answers
133 views

RC circuit with time varying capacitor

I am considering a series RC circuit with a voltage source. simulate this circuit – Schematic created using CircuitLab The capacitance of the capacitor varies with time. I am doubtful if this ...
0
votes
1answer
75 views

Applying superposition in circuit analysis

The question asks to determine the currents supplied by the two sources in the circuit. I don't want a solution. just want to know if I apply superposition, I will get the current of each source, ...
0
votes
1answer
53 views

Should I be using two half bridge drivers, or can I use two single MOSFET gate drivers?

I am in the middle of doing some research on gate driver ICs and I'm wondering why it is more common for people to use two half bridge driver as apposed to using two gate driver ICs. Here is the more ...
0
votes
2answers
67 views

Is it possible to have same potential in different branches of some circuit?

I've been wondering. Can I check if 2 points on a circuit are the same branch with voltage check? What if both points happen to have the same potential, being them separated by high impedances? (so ...
0
votes
2answers
81 views

No discharge from capacitor

I’m currently trying to make an electrical discharge machining (EDM) machine that uses electrical discharge to erode away metal. Right now, I’m just trying to test it out with a 200V 100uF capacitor, ...
0
votes
1answer
62 views

Validity of small signal model during transient state

In most of the books it looks like small signal is used as a steady state analysis, for example a capacitor is modelled as: $$Xc=\frac{1}{j \omega C}$$ Which clearly indicates a steady state analysis. ...
0
votes
0answers
55 views

Question - Calculating Coefficients for 2nd Order Transient Analysis

I am struggling with calculating the coefficients for second order transient analysis. For example, when analyzing a underdamped circuit, we know that the equation for voltage or current is \$x_{t}=e^{...
1
vote
2answers
57 views

Help with the error K2_A2 Coupling to shorted-out inductor L5 and looking for pointers for better modelling SWR

I have an RF linear amplifier kit that I am trying to better understand. The problem I am having is that my driver/transmitter is seeing a non matching impedance. To better understand the amplifier ...