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

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How do I create GPIO outputs from circuit to connect to Arduino Micro

how do i design the GPIO outputs so i can connect it to two pins on my Arduino and get the readings. ie. if green didoe is on GPIO 1 = High, other wise Low if red diode is on GPIO 2 = High, ...
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37 views

Working out current, voltage and resistance in a Bridge circuit?

This community is so helpful, my thanks go out to any comment I got with helpful advice. Here's another homework problem. I've tried working most of it out, but I have a feeling that I'll have to ...
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35 views

AC and DC circuit analysis question

simulate this circuit – Schematic created using CircuitLab Can somebody help with doing the DC and AC analysis of this circuit to find RE and R2 such that Ai(Current gain) = 32. I have no ...
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4answers
112 views

How would you solve this resistive network?

simulate this circuit – Schematic created using CircuitLab I'm not really sure how to solve this. I can't see any series or parallel connections. I need to find the Total resistance, V1 ...
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3answers
57 views

How would I monitor I/O on multiple circuits at the same time?

I've got a device that communicates over a 8 wire cable. I'd like to examine the signals going into and out of the device without having to test each line individually with my multimeter. Is there a ...
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44 views

Energy absorbed by the condenser

If the current \$i=0\$ the total energy absorbed is: \$E_{tot}=E_C+E_L\$, where \$E_C\$ is the energy absorbed by the condenser and \$E_L\$ that absorbed by the inductor. Now: \$E_C=\frac{1}{2}C ...
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1answer
33 views

Calculation of a current in the Laplace domain

In the circuit below (working in the Laplace domain), I have to calculate \$I\$. $$\begin{align} &I=\frac{-V_L-V_C}{sL+\frac{1}{SC}}=\frac{-V_L - \frac{V_0}{s} - I \frac{1}{sC} ...
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74 views

How to design blinking LEDs circuit using analog elements only?

I want to design a circuit to blinking three LED in a row with 2 second delay for shifting/changing using analog elements only (using Resistors, Capacitors and Transistors and without Micro ...
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1answer
37 views

Replacing a piezoelectric speaker with an electromagnetic one

I'm making this circuit: where X1 is a piezoelectric speaker or ear piece. However, the only kinds of speakers I can get in time to finish this project are electromagnetic ones (we found one in a ...
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1answer
32 views

Superposition on a circuit with just one source

I'm trying to analyse this circuit (state variable filter): All the places on the web I've found solve it first using superposition, creating an equation of the form \$ V_2 = kV_1 + kV_4 + kV_3 \$. ...
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2answers
25 views

Parallel networks and references

I have a very simple question regarding parallel RLC networks (or any similar circuit). When given a problem where the reference voltages and current directions are allocated 'strangely', is my ...
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16 views

Circuit to integrate BeagleBone Black with Pressure Regulator

I am using BeagleBone Black as controller to control a proportional pressure regulator (Festo VPPM-6L-L-1-G18-0L10H-V1P-S1) which is the actuator of my project. The pressure regulator has an input ...
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3answers
50 views

What is the Voltage output of this Unity gain amplifier?

This Unity gain op amp has a ac supply in line with the resistor to the positive terminal of the op amp. What is the formula to obtain the output voltage? My challenge is the additional resistor ...
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21 views

S domain analysis initial state

Hello, I have a question about s domain analysis. I couldn't handle the initial state part since there is both dc source and an ac one. If I could do the initial I will be able to solve the rest by ...
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1answer
41 views

Voltage calculation with the nodal analysis

I'm having problems with the calulation of \$v\$ in this circuit. simulate this circuit – Schematic created using CircuitLab With the nodal analysis (K.C.L. at the node 1) I got: ...
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34 views

RC first-grade circuit with op. amplifier

I tried to calculate the voltage \$v_u\$ in this RC circuit, but I got stuck when it comes to calculate \$v_u(\infty)\$ and \$\tau\$. simulate this circuit – Schematic created using ...
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26 views

RC/RL first-grade circuit

GIven the following circuit I have to calculate \$v_c(t)\$ and \$i_L(t)\$ simulate this circuit – Schematic created using CircuitLab Their expressions are: ...
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2answers
67 views

LM324 Pre-Amp For Mic (to PC) Not Working

I don't have much experience in circuit assembling or designing but I wanted to create a pre-amp for my microphone(Philips SBC MD110 Dynamic Microphone which I directly connect to my PC) to boost the ...
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4answers
72 views

Calculation of the input resistance of an op amp circuit

After I calculated that $$v_s=v_u\left(\frac{R_1}{R_1+R_2}\right)$$ I have to calculate the resistance seen by the voltage generator \$v_s\$. My book, without any calculation, says it is: ...
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1answer
47 views

How does this timed fan controller work?

My bathroom fan controller recently started misbehaving, so I pulled its PCB out. This is what I found. simulate this circuit – Schematic created using CircuitLab LIVE/NETURAL are the ...
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2answers
98 views

Are op-amps always assumed to be ideal?

Given a circuit with resistors, op-amps, independent voltage and current sources, how do I solve the node voltages? Do I always assume that op-amps are ideal?
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3answers
124 views

How does one approach designing an amplifier using BJTs to drive an 8 ohm speaker?

For a lab class we were assigned a final project where we have to design an amplifier using BJTs, diodes, and capacitors (MOSFETs are not allowed) in order to drive an 8-ohm speaker. The requirements ...
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1answer
38 views

How do you solve Thevenin equivalent for circuits with variable resistors?

I have this circuit and I have to solve the Thevenin equivalent across the terminals A and B. How do I solve for RTh in terms of the variables present in the circuit?
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71 views

How does the RC time constant affect behavior of a passive integrator/differentiator?

I'm reading the first chapter of the AoE. I've come across this section on differentiator/integrator circuits and couldn't understand the math behind it. For the first picture, it says small RC ...
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77 views

Circuit analysis and general study tips [closed]

The more work I do in the field of EE, the more I realizing that my general circuit analysis skills are usually the root of my confusion and could use improvement. Even after putting on my ...
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33 views

Complex system circuit design and simulation

I'm building a solar powered GPS tracking device using an Ieik Mini Nano V3.0 Atmega328p microcontroller board (based on Arduino Nano), Adafruit Fona GSM module, Ublox NEO-6M GPS module. The GPS ...
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111 views

Help with DC circuit theory problem

I need help with this DC circuit problem: When the switch is open, voltage between points A and B is 2V. When the switch is closed, through variable resistor \$R_{p}\$ flows maximum current, and ...
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1answer
51 views

Wireless Power Transfer Circuit Theory

I made this circuit, and it is working fine. But didn't understood the theory in it. How is it putting a frequency in the coil? It did not match with any of the oscillator circuits. And also it is not ...
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23 views

Finding the DC operating point of this circuit

I'm trying to find the dc operating point of this circuit, it is given that: \$V_{BE_{ON}} = 0.7v\$, \$\beta = 100\$, \$I_{DSS} = 10mA\$ , \$V_P = -2v\$ and also that \$V_A = 1.8v\$. Here is what I ...
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3answers
44 views

Complex power calculation across parallel loads

I have the following problem which require the calculation of Load L3 apparent power, real power and reactive power. I have done the following as the described in the figure trying to get 2 ...
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17 views

Referencing DC Operating Points When Plotting Expressions in LTspice

I'm new to SPICE, and I have a question about SPICE commands and references. I've been using LTspice to design a multistage amplifier, and I am interested in plotting out the outputs of each stage, ...
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1answer
53 views

The Use and reason for High K materials

I am new to advanced integrated circuits as it is my first course on the subject and there was a discussion about geometrical scaling in the seminar. The discussion proceeded with the fact that ...
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26 views

Does the choice of ground/reference node influence the results found with nodal analysis?

I'm currently taking my EE introductory course about circuit analysis and I'm having some issue. I felt like I had finally understood how to (somewhat) properly perform Nodal Analysis. I attempted to ...
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73 views

What is the rule used to solve this equation?

This is the quetion : Find the capacitive reactance that when connected in parallel with the load will make the load look purely resistive. And this is the answer
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1answer
58 views

Why some circuits do not work [closed]

Why some circuits which are made by professional does not work but theoretically they are correct i tried to make circuits of some well known web sits but all of them were just crap and wast of time ...
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53 views

Why is E_1 negative in an exact transformer equivalent circuit?

My electrical engineering professor has written the primary EMF with a negative sign in the transformer equivalent circuit: He has also written this equation relating to the circuit: ...
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3answers
81 views

Frequency response of a complex circuit

I am interested in finding the impedance as a function of frequency of the \$n^{th}\$ circuit in this series: simulate this circuit – Schematic created using CircuitLab (By request: this ...
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1answer
33 views

Simple Mux Equation finding, need help?

How we can find the equation of following simple diagram ? My TA solved it as : C.Not(B).A + B.Not(A)
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38 views

Can someone demonstrate the passivity property of a RC circuit?

Intuitively, a RC circuit is considered a passive element because it does not require power to operate as contrast to Op-Amps. But the passivity property is most precisely defined via the mathematical ...
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1answer
65 views

Is there a way to find this resistance? [duplicate]

I have done thevenin analysis on a larger circuit and have gotten the result below. I need to find the value of RL. Would I use thevenin again? But that would give me the same result because I would ...
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1answer
43 views

Finding V(l) for t>0 in RL circuit

One of my problems asks me to find the voltage at time greater than zero. The first part of the question asked me to find current. I was able to solve that part and found it using the general solution ...
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75 views

Why is the rectifier necessary in this circuit?

I asked a previous question about this circuit: I am fairly confident that I understand why the transformer coil only sees something like 2V. What I am now unsure about is why the rectifier is ...
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2answers
275 views

Help me understand this load detecting circuit

I'm looking at this circuit: Which has come from here The claim is made that "it detects a voltage drop across a large bridge rectifier that acts as a high power shunt", which is referring to the ...
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2answers
56 views

Finding Vc in this simple circuit

simulate this circuit – Schematic created using CircuitLab Forgive me if it's a basic question, but I am stuck with this. Is this the correct way to do it: Do voltage division between R1 ...
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2answers
91 views

Confusion over a simple 4060 LED blinker

I'm trying to build a simple LED blinker using a 4060BP binary counter, as per the following: and (Originals here and here). When I have built either circuit, the LED (I'm just using one for now) ...
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70 views

Can't figure out circuit analysis

The original homework problem is as follows: I have the solution from the professor, but I don't understand why he rewrites the model the way he does, and I also don't understand the derivation of ...
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0answers
26 views

Mesh analysis confusion — resistor polarity

I used mesh analysis to find Vo in the figure below. However, my set of equations just end up cancelling each other when I do the math. I am also not sure if the polarity of the resistors changes ...
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1answer
37 views

How can I figure out the voltage in this circuit? [duplicate]

I'm supposed to use nodal analysis. Node A is the left one, node B is the middle one and node C is the right one. The bottom one is my reference node. So I got these equations: Node A: \$ -5 + ...
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1answer
60 views

Buffered feedback circuit analysis

I saw this circuit while going through some circuits and have been trying to solve it since. I get confused at multiple points while solving for the current. Since there is a buffer for ...
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1answer
27 views

A basic question about this nodal analysis

I have this circuit which I have to solve for Io using nodal analysis. Everything seems easy but I am confused about the nodal equation for V2 given below in the solution. They seemed to ignore the ...