Questions tagged [circuit-analysis]

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

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16 views

Whats the output of the integrator? and how do i find the frequency? OpAmp Integrator+Schmitt Trigger

(Sorry for bad english,i speak spanish). This is the circuit: Integrator analisis: From this formula i don´t know hot to get the frequency. (idk if this is right but i think it is) i found a website ...
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74 views

Does the circuit troubleshooting tool used in 2001 A Space Odyssey exist in the real world?

In the well known science fiction film 2001 A Space Odyssey there is a scene in which Bowman and Poole are trying to locate the fault in the AE-35 unit. If memory serves, they use a tool which allows ...
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93 views

NPN and PNP to drive LEDs

I have the following circuit below. One of the restrictions I have is that I need to drive 4 LEDs using 9V. (sorry I forgot why 9V is not enough for all 4 LEDs in series so there's a drop voltage ...
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70 views

What's the performance difference between these two differential amplifiers?

Both of the below circuits are sinking 1A of current.The TL074 has a slew rate of 13V/us and OP07 0.3V/us. Does that makes the upper circuit have s slower response time? What other differences, ...
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21 views

SBC power on LED Indication

I am using SBC ABP 3000 in my application. The SBC will be placed inside a unit. I need to provide the SBC turn on and Off status to the external LED for indication. In the user manual, the J-status ...
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1answer
81 views

Inductor behavior in DC circuit

An inductor in a pure DC circuit once steady state is reached has a zero volts across it. In the figure below, the inductor will have a voltage which is not zero Why isn't VL zero?
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37 views

Output enable logic of AM26LS32AID

I am planning to use AM26LS32AID in my design. In order to enable the output pins of this chip, G and #G need to be connected to VCC and GND respectively as per the datasheet. AS per the below logic ...
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66 views

Different voltage sources in parallel (Ideal)

What if we connect two different voltage sources in parallel in ideal condition? From the question here that is assuming internal resistors, Different voltage sources in parallel, I thought I can ...
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59 views

How to explain the simulation results of this op amp from LTspice?

Here is what caused my confusion Why the simulated output voltage is not 0 when the input amplitude at both terminals is 0. When the input amplitude is 0(i.e.the input terminals are short-circuited), ...
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51 views

LED blink circuit with push button

I am trying to build a circuit on a breadboard that consists of two LEDs and a push button. Using the button, I would like for the LEDs to blink singularly for 1 second on and 1 second off. Using the ...
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51 views

Nodal Analysis - Kirchoffs Current Law

Hello, I am stumbling across an issue here. So in Nodal Analysis, we identify our reference point and label the voltage nodes. Then we use KCL to find out equations and solve. My book is providing an ...
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57 views

Please help me get this equation part right

Hello everyone, I am understanding the concept of mesh analysis and super meshes. In the Practice problem below, I am presented with a dependent current source and it lies between mesh 2 and mesh 3. ...
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129 views

Thevenin equivalent resistance of a complex circuit

I have a complex circuit. I have found the thevenin equivalent voltage V_t, by making two equations. Its V_t=3.877 V Now I have to find the thevenin quivalent resistance. I was thinking of short ...
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140 views

How to calculate effective resistance of this square block with contact in the center?

The first figure shows the layout of a metal wire and current flowing in the metal from left to right. Assume that that the sheet resistance of the metal is ...
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77 views

Is my proof of voltage in inductor being the same as that of the battery when no resistance is present in wire and 0 when there is resistance correct?

When resistance = 0 Let v(in) be voltage due to inductor, v be voltage of battery We know \$ V_{in} = L\frac{di}{dt} \$ As i = voltage on wire/ resistance on wire \$ i = \frac{v-v(in)}{0} \$ \$ V_{in} ...
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115 views

What are the consequences of using a capacitor that is of higher capacitance?

I'm troubleshooting a circuit board that has a dead short somewhere. I removed some capacitors which were shorted in circuit but the problem was elsewhere on the board. When testing these 1500uf 2.5V ...
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47 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 ...
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1answer
83 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 ...
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47 views

About the feedback Topologies [closed]

Until just know, I didnt know there are amplifiers with feedback (besides the opamps and BJT ones), so I'm a bit confused about it. I have been reading a few literatures, but I can't understand well,...
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48 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 ...
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3answers
200 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 ...
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58 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.
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53 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)...
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117 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 ...
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67 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 ...
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120 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 ...
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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 ...
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124 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'...
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463 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 ...
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86 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}}}...
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65 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\$. ...
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101 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 ...
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57 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 ...
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630 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 ...
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31 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? ...
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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 ...
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143 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 ...
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1answer
103 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 ...
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49 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 ...
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3answers
134 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 ...
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1answer
81 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 ...
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56 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/...
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139 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 ...
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121 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 ...
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75 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 ...
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52 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 ...
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59 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.
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114 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
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1answer
34 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 ...

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