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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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Calculate current in branch using Thévenin's theorem

E1 = 20 V E2 = 5 V R1 = 10 Ω R2 = 20 Ω R3 = 10 Ω R4 = 10 Ω R5 = 5 Ω Calculate Ix. It's obvious that the Thévenin's theorem should have been used, but the implementation is a bit confusing ...
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what is the voltage marked \$V_{x}\$? [closed]

what is the voltage marked \$V_{x}\$ ?
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Circuit analysis with nodal analysis

[EDIT] I'm going to give mesh analysis another go, and see where that gets me. [DOUBLE EDIT] Mesh analysis didn't get me anywhere :( Im tearing my hair out over this problem, so any help would be ...
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Help me in understanding the circuit [closed]

I want to understand this circuit. The Circuit: My experimental layout: Question : According to the circuit.. It mentions that the "The Thermal Pad is to be connected to a Ground Plane (GND, ...
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Find Vo in an op-amp - transistor circuit

I have a schematic with this system and can't find out how it works: simulate this circuit – Schematic created using CircuitLab How do I find Vo in this network? Please explain it "for dummies"...
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Checking materials (cheapest possible) to be used for a solar dark-detecting LED light bulb circuit

I want to make this circuit, which includes a joule thief: It's for a solar dark-detecting LED light; and I'm trying to follow this guide: https://www.instructables.com/id/Solar-LED-Light-Bulb/?...
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576 views

Solving this op-amp circuit

I would appreciate some help solving the following circuit. I've been trying for a very long time and can't get the same answer the book has. I'm trying to get \$ V_o \$ in terms of \$ I_{os} \$. ...
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656 views

Basic circuit analysis - diferential equation

This is the circuit I got from an example in a book "Practical Electronics for Inventors", on page 48: How can one understand that \$0=R\frac{dI}{dt}+\frac{1}{C}I\$ implies \$I=I_0e^{\frac{-t}{RC}}\$?...
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Is there a way to create a 2 bit / 4bit memory element using Flip Flop?

I have come across Flip-Flop memory elements & it seems really cool, So far i have only did Set, Reset Using Flip Flop, I am eager to know that Is there a way to create a 2 bit / 4bit memory ...
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3answers
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Circuit Analysis With Non-Ideal Diodes

I have seen how to do circuit analysis with ideal diodes, that is replace forward-biased diodes with connections and replace reverse-biased diodes with gaps. But the problem is that I want to know how ...
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2answers
661 views

How can I improve my Freq to Voltage circuit?

I had a term project which was based around Analog-to-Digital convertors. We used anLM2907 Freq-toVoltage convertor to take a 150mVpp sine wave (0- 1kHz) and convert that to a voltage. The voltage ...
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How to find Thevenin resistance of circuit with voltage source and three resistors?

The question is: Replace the circuit with a Thevenin Equivalent Circuit and find the Thevenin Resistance (Rt) in ohms. I've used Thevenin before and solved quite a few equivalent circuits as well. ...
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How to efficiently compute the current at each node in a resistor network

I encountered a academic research problem to efficiently compute the current/voltage at each node of a rectangular resistor network. The rectangular resistor network that I have is defined by two ...
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4answers
183 views

Resistor and heat

Due to a power supplier manufacturer chanege the BOM lately, it require now more current to be drawn (need more load on my circutry side). I added a resistor in order to draw more current from the ...
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1answer
934 views

PSpice homework Question

I'm having trouble with this question. Can somebody help? I know the equation for part a) is: $$P_{\text{max}} = \frac{1}{4} \cdot \frac{\mid{}V\cdot{}t\cdot{}h\mid{}^2}{R_\text{L}}$$ And I'm sure ...
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Format Approach to NODAL ANALYSIS

SITUATION: Nodal Analysis is nothing more than applying KCL and is very powerful. I'm working on developing a more clearer perspective of two approaches in Nodal Analysis "GENERAL & FORMAT". Mesh ...
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How to apply the Barkhausen criterion in order to know if a system will oscillate?

How to analyze or apply the Barkhausen criterion for oscillation of the astable multivibrator below? The criterion talks about the magnitude of the products in a loop must be equal to 1 (ideally) The ...
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2answers
436 views

Circuit breaker selection that can be tripped with a microcontroller

I am designing a system that will simulate an upstream fault with a micro-controller action. the micro-controller will send a signal to a circuit breaker to simulate a line to ground fault(just like ...
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4answers
468 views

Solving a circuit with a directional loop

I came up with the following circuit: Please disregard the labeled values in the diagram - the resistances are identical for the sake of simplicity, and of value \$R\$, and the voltage has value \$V\$...
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3answers
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Nodal analysis for current controlled current source

Okay here I go. I just started learning nodal analysis technique but I feel its difficult in solving the circuits consisting of dependent current and voltage sources. Im unable to solve this circuit. ...
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3answers
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Dirac Delta Impulse Response of series RC circuit (Voltage across the capacitor)

I have evaluated the transfer function of an \$RC\$ circuit, getting the following transfer function: $$H(s)= \frac{1}{1+sCR}$$ the impulse response (i.e. output response to a Dirac's Delta) would ...
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When to use Nodal Anaylsis / Mesh / Superposition?

I'm studying these three methods and i'm confused on exactly which one is used when. This is a very broad question. Therefore, could some explain in general terms the difference of the three methods ...
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Node Analysis - current calculation

I have a cicuit here that's giving me trouble when finding out what V1 and V2 equal.The book says that I1 is traveling through the 8 ohm resistor (R1) towards ground. But when I build the circuit on ...
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247 views

KCL Node Analysis

I can do mesh analysis with KVL no problem however trying to switch over and to KCL with Node analysis I cannot understand. How do you determine current coming in to the node? I don't understand how ...
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1answer
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Circuit Simulator is being funky

This circuit simulator called "iCircuit" for mac users is showing some weird readings. It's showing a reading of 2.4mA and i'm getting 6mA in my calculations for this circuit I threw up. Am I missing ...
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2answers
484 views

Calculate transfer function with Sine generator

Given this circuit I would like to know how can I find it's transfer function. A method I've considered was to use Node Equations on nodes 1 and 2 , and I have a few things that I don't find clear :...
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283 views

SuperNode Problem

I'm still having problems with supernodes. Correct me if my logic is wrong. I took the KVL of the circuit which was \$-v_1 +2V_o + V_2 = 0\$; Afterwards, I did the nodal analysis of both the ...
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537 views

Electromagnetic induction circuit

In the picture below we see 3 LEDs in a parallel circuit. When the switch is closed only LED 2 and LED 3 are on. LED 1 isn't on because it's a diode in the opposite direction. You observe what happens ...
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Question about AC-RL circuit

A source power with $$v(t)=5\sin(\omega t)\text{ V}$$ and frequency 1kHz is connected thought an \$RL\$ parallel circuit. The maximum current is 5mA and the resistor current is 4mA. What is the value ...
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4answers
15k views

How to solve R-parallel RC circuit?

How to calculate the Vout when the input voltage Vin is = 20V DC + 10V AC. Here is the circuit:
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1answer
162 views

Help on superposition

I'm trying to figure out \$V_x = V_x' + v_x''\$ For \$V_x'\$, I had open the current source, and tried to solve using KVL. Obviously, \$i_2 = 0.1v_x\$. The equation I concocted was \$-10 + 24I -....
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current amplification of a circuit containing a transistor

I'm having trouble with a BJT circuit. What we are given: \$U_{CC} = 10\text{V}\$ \$R_C = 972 \Omega\$ \$R_B = 14\text{k} \Omega\$ \$U_{\text{BE}} = 0.7\text{V}\$ \$I_C = 12\text{mA}\$ We need to ...
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Circuit short circuit capacitor question confusion

I am really unsure about how to go about this question and which circuits to consider. Here's the question: Determine the value of the current labeled \$i\$ and the voltage labeled \$v\$ at \$t=0+\$...
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1answer
206 views

Unstable points in a basic memoryless circuit

I have been told that there can be more than a single solution to a circuit, and that some of those solutions might be unstable. As a simple example, a resistor with a constant power source, connected ...
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414 views

3rd lumped circuit abstraction postulate

So i was reading Anant Agarwal's book Foundation of Circuits and stumble upon this postulate "Operate in the regime in which signal timescales of interest are much larger than the propagation delay ...
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Circuit Analysis Shortcuts

I am slowly learning how to analyze circuits but I am wondering if my goals are unrealistic. My main reason is to help me repair circuits boards that I come across in my line of work. (I repair coin-...
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Confusion about apply nodal analysis

I'm still new to EE, and taking a introduction class right now. I have a simple question regarding nodal analysis. Suppose that we have three things connecting in parallel, One 12 voltage source ...