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

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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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2answers
61 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
50 views

Why some circuits do not work [on hold]

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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26 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
77 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
25 views

Simple Mux Equaion finding, need help?

How we can find the equation of following simple diagram ? My TA solve as : C.Not(B).A + B.Not(A)
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37 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
64 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
40 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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3answers
73 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
272 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
54 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
74 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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67 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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25 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
54 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
23 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 ...
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3answers
75 views

How do I solve this circuit using nodal analysis?

Hey guys I cannot wrap my head around this damn circuit and how I'm supposed to solve it using nodal analysis. I chose the bottom node as my reference node and I got to these equations: Node A is the ...
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1answer
82 views

2.2K Resistors on Microchip Data Input Lines [duplicate]

I've just been dabbling for the first time into circuit design with microchips and I noticed a lot of designs put 2.2K or 4.7K resistors on some input lines. I get that this is to limit the ...
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37 views

Need help about the sign conventions used for voltages in the ckt

What are the significance of the sign convention of the voltage drops shown in the ckt. Vo = Initial charge of the capacitor
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1answer
61 views

Why aren't the points to the left and right of \$R_1\$ and \$R_2\$, respectively, nodes?

What I don't get is by the definition of a node -- a point where two or more circuit elements join -- it appears that the dots to the left and right of \$R_1\$ and \$R_2\$ are nodes; both of those ...
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1answer
47 views

Power Consumption and Expected Lifetime for a given design

I have a requirement where I need to sense proximity with Hall Effect Magnetic switch and to send the detection over Bluetooth. There are space constraints for this module and hence coin power cell is ...
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2answers
37 views

Confused about this KVL equation (AC circuit)

I have the following circuit below, with part of the solution: I need to find Z. I'm confused about the KVL equation below (fourth line): If I understand correctly, they used loop analysis: with ...
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2answers
88 views

Need help with fundamental understanding of voltages in this circuit

Looking at the below schematic, with LED1 being a red LED (1.7V forward voltage) and LED2 being a green LED (3.2V forward voltage), I have a few questions that probably reflect lack of some ...
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1answer
26 views

Node voltage for simple circuit

This is probably a dumb question but I'm not sure what voltage is on this specific node. Also ignore values, they are random. Is it considered 0V or +V3? Then would the voltage drop of R1 be V2 or ...
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1answer
79 views

help solving circuit [closed]

I'm looking for help solving this circuit. what is the value of the resitor R4, knowing the Voltage between points A and B ( Vab=0,2V). thanks
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1answer
116 views

Help understanding circuit in Forrest Mims' Getting Started in Electronics

I've worked through Forrest Mims' Getting Started in Electronics, but cannot figure out why the below circuit (on page 92 in the fourth edition) claims that LED1 and LED2 alternate in being lit ...
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1answer
46 views

PWM vs Analog Signals

Oftentimes in EE classes we learn about AC analysis and phasors and other stuff heavily based on analog signals. I also know that many digital applications approximate analog signals using PWM. But ...
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Circuit Analysis - simplify circuit to calculate current

I have to calculate the current i in this circuit (the values of the resistences are in Siemens, not in Ohms) Using the equivalence between a voltage source in parallel with a resistor with only a ...
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2answers
40 views

Solving for the impedance and phase shift in a series-parallel AC RCL Circuit with Complex Numbers

Having a lot of trouble working through an AC circuit, asking for some help. The circuit is relatively simple - I have a capacitor of capacitance \$C\$ and resistor of resistance \$R\$ hooked in ...
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3answers
116 views

Single-supply DC amplifier circuit with “gain” of 0.66?

I have a DC voltage source \$V_{in}\$ which slowly varies in the range 2.5…4.8V. I need to linearly scale it down by ⅔, to feed into a 3.3V ADC pin. For a voltage divider, the source has too high ...
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1answer
56 views

Voltage drop across a series with a source and a resistor

I've tried using KVL and KCL but nothing I do is resulting in an answer. I am struggling with how to treat the voltage drop and the two resistors that are in parallel with each other. I think I may be ...
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3answers
80 views

I can't figure out this circuit. How do I obtain the three currents?

I can't figure out why i2 is 0. I tried applying KVL on the mesh with the voltage source but I didn't get anywhere (perhaps I applied it incorrectly? i don't know if the current travelling through ...
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213 views

How do I use superposition to solve a circuit?

Yes, this is a pedagogical question. While answering another recent question, I wanted to refer the OP to concise instructions for using superposition to solve circuits. I found that all the easily ...
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2answers
93 views

Is there a simple circuit that outputs (min+max)/2 of a single-ended signal given as input?

I have a digital, single-ended, signal that randomly varies between +400mV (logical ‘1’) and 0V (logical ‘0’). I am looking for a circuit to calculate the DC value that corresponds to the average ...
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41 views

Node-Voltage assistance

I have to use node voltage to find the values of i1 - i6 simulate this circuit – Schematic created using CircuitLab Yes, I am aware that it would be a lot simpler to use mesh current ...
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3answers
94 views

How to level shift an analog signal?

I have a sinusoidal input signal (with a swing of 100mV roughly) centered around 100mV (DC). This signal needs to be input to a CMOS inverter. For this I need to level shift my signal around the ...
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2answers
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Question about this RC circuit and voltage across the capacitor

I just have a small question about the below problem. How did they get Vc of the capacitor to be 12 V before the switch is opened? Doesn't the resistor use up some of the voltage?
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1answer
57 views

Need help finding the drain current of a jfet

I have this simple dc jfet circuit (homework): First of all I had to find the values of the drain and source resistors given the data above, this was pretty simple and I got: $$R_D=4k\Omega $$ ...
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1answer
47 views

Clipping circuit simulation producing unexpected result

I am playing around with a clipping circuit to protect a adc on my microcontroller. I beleive the following will work, but when I simulated the circuit I saw something funky. Any ideas on why adding ...
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1answer
159 views

Why does a Thévenin equivalent exist but not a Norton Equivalent, and vice versa?

In the following diagram, the Thévenin equivalent of the circuit on the left is shown on the right: simulate this circuit – Schematic created using CircuitLab However, it appears that ...
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54 views

KVL, KCL, nodal and mesh analysis

How do I write the KCL equation at node B using the node voltage at B, A and R1, R2, R3 and not in terms of ia ? By the way, label the node between R2 and R6 as node D.
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2answers
57 views

Voltage Doubler stops 'Doubling'?

I constructed a simple voltage doubler on a bread-board. Here's the schematic. simulate this circuit – Schematic created using CircuitLab The output across the 100kΩ resistor was the ...
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3answers
77 views

Basic Circuit Question

I need to confirm something.Do circuits like the one shown below in which there is no connection between points A and B,treated as separate loops with no connection between them?
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1answer
69 views

How to find the Q point of the NMOS trsistor in Voltage-Divider Biasing Circuit?

The following is the circuit needed to be analyzed to find the Q point(\$V_{GS_Q}, V_{DS_Q}, I_{D_Q}\$). \$V_{TN}=1\text{V}\$ \$K_n=0.5\text{mAV}^{-2}\$ simulate this circuit – Schematic ...
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2answers
55 views

How does a synchronous motor know to increase current when the mechanical load is increased?

Consider a very simple singe phase synchronous motor, such as the one shown in figure 1. This motor will not be self starting, but if an AC voltage is applied and the permanent magnet is given an ...
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38 views

When to use Delta-Wye Transformation?

I have these two circuits needed to be simplified. Now in Case 1, is R4 and R5 in parallel connection? In that case, how does the equivalent circuit look like when R4 and R5 is simplified? Or if ...
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1answer
72 views

How to convert Sequential circuit into a combinational circuit?

My question in general asks how to transform a sequential circuit/FSM into a combinational circuit. The reason why I'm asking is in SAT solving, we can use only combinational circuits. And so in ...
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1answer
39 views

Constant Voltage model pf Diode circuit analysis

I have solved this problem assuming an ideal diode model, but now I'm required to use the \$0.7\$V constant voltage model. If the same circuit in ideal model had both \$D_1\$, \$D_2\$ conducting, does ...