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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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Symmetrical Component Analysis Circulating Current & KVL

I was reading in John Grainger Power System Analysis and have a question in mind. Below is the delta connection of an unbalaced 3 phase system with unsymmetrical loads $$Z_{\Delta 1} \neq Z_{\Delta 2} ...
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CAN Transceiver Behavior during fault conditions

I was just trying to understand the CAN transceiver TJA1042T behavior during fault conditions: CANH short to BATT CANH short to GND CANL short to BATT CANL short to GND I'm powering on the ...
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Can you connect multiple photodiodes in parallel and treat it as one?

Im working on an IR sensor based off of the Texas Instr. particle sensor (TIDA-00378). They use just one photodiode in their design. I would like to use multiple photodiodes, lined up with multiple ...
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How to reduce resistor power consumption?

I've started learning about transistors and was working on this circuit, and have fiddled around with the circuit simulator for a couple hours, but can't seem to find an efficient design for what I ...
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SparkFun Sound Detector Circuit Analysis

I would like to request some help in analyzing the op-amp circuit used by SparkFun here. I'm particularly interested in the pre-amplifier portion of this design. The write-up included by SparkFun ...
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Voltage Controlled Voltage Source Circuit Analysis

I don't know what I'm missing with the analysis of this question. Obviously I know that there's no voltage through the 105k resistor. I know that the current from the VCCS is given by the input ...
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Network Resistance equivalent

simulate this circuit – Schematic created using CircuitLab I am having difficulties in simplifying and finding the equivalent for the circuit shown. Can someone guide me to the appropriate ...
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What tools can I use for parametric circuit analysis?

I have analog circuit designs that I want to analyze for accuracy, etc. according to the component variations based on tolerance, temperature, etc. To elaborate further, imagine there is a circuit ...
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TI Photodiode Trans impedance amplifier Circuit?

I am designing a Photodiode(Vishay/ current of 15uA) circuit amplifier (TI ) in SIMetrix. frequency of Photodiode is 1MHz. I choose an Amplifier from TI as OPA355_Q1(spice model imported from TI) and ...
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AC Circuit Analysis with Diodes and Op-Amp

The following circuit is given: The 2 diodes are idealised in the following way: All other parts have the following properties: I've been trying to figure out what the voltage at the entrance of ...
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959 views

What is wrong with my KVL approach on a really simple circuit?

Hello, so this is a really simple circuit question that has been bothering me. I know that by simply looking at the circuit and using logic it makes sense that the voltage drop across the resistor(as ...
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Phase Shift due to Capacitor

Consider the following circuit, Running an AC simulation, Now consider this, Running an AC simulation, How come with the RC circuit, we have a constant -90 phase shift. I don't understand how the "...
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How should I go about reverse-engineering this printhead?

I'm interested in using the Epson FA04010 printhead in a project. I'm pretty sure it uses piezo-based inkjet tech, and I can see in the product images it has 21 pins. I can't find any specs at all for ...
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479 views

Fixed a garage remote by breaking it

I have a garage remote that stopped working. I changed battery and it worked again, but only for a few days. I measured the resistance between the poles of the battery terminals and it was about ...
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Nodal analysis using supernode tough problem

Hi I am stuck on the following problem: I know I have to use a supernode but I dont know where to put it.
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121 views

Capacitor Voltage in RC Network Circuit

I am understanding a rc network shown in the above image . I need to calculate the Value Vc after i give 24 volts step input for 16 μs. i used capacitor charging equations Vc=Vinput(1-e^-t/rc) ...
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62 views

Potential difference between these points

I do not know how to approach this problem or which theory to apply. Could you please help me to find out the potential difference between the points A and B in the circuit given below.
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NPN trigger voltage & resistor temperature

I want to trigger the base directly. What must be the voltage needed? This is the datasheet. http://www.secosgmbh.com/datasheet/products/SSMPTransistor/SOT-23/MMBTA44.pdf Can I just use DC and ...
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Balancing Power in a Simple Circuit When not all Wattages are known

I am having trouble solving the following problem. I understand that the net power should be 0, but it seems that there is no way to determine the power of elements 2, 3, and 5. How would one go about ...
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How to determine sign across current source?

I'm confused about how to determine sign orientation for current sources in circuits. From what I understood initially, it's negative to positive for both independent and dependent current sources. ...
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142 views

As we go around the circuit, the total voltage drop must equal zero

I am studying an advanced mathematics textbook. One of the examples is within the context of an electrical circuit (a series circuit, I think). The example makes the following claim: As we go ...
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Difference b/w Symmetric and Reciprocal Networks

A circuit exhibits symmetry when interchanging ports across a plane of symmetry results in no change in the impedance, admittance or scattering parameters of the circuit. Reciprocity also means ...
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shorting resistors in series & tricky NPN circuit [closed]

If you have 3 resistors in series with 2 ohm each and power supply is 3v. Each resistor would be 1 volt each. What would happen if you short it like the following? What would be the voltage of each?...
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CCTV Loop Out Circuit

I need one camera IN & TWO outputs to feed into 2 DVRs.Just a resistor divider ok ? Like this? Camera Types are AHD & Analog. simulate this circuit – Schematic created using CircuitLab
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Differential amplifier, superposition theorem, output derivation, what is a loop here?

So based on this article, when V1 is removed/grounded, in this picture. Is the loop number 1 drawn correctly? Or does R3 and R4 both belong to the same loop? I'm not sure how Vout2 was calculated. It'...
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How to choose RF choke in the biasing circuit of varactor-tuned resonant circuit

I am new to circuit and has a very basic question about how to set biasing circuit of varactor. I need to use varactor to tune the resonance behavior of Split ring resonator (SRR) structure when ...
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142 views

Advice for this P-Channel MOSFET Power Source Selector

I know there are already questions and answers about P-Channel MOSFETs and power source selection, but I still find myself pretty confused, as many of those are more complex than my circuit or simply ...
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transformer voltage analysis

I'm trying to figure out the voltage and current (and subsequently power) of the resistor R2 in this circuit: simulate this circuit – Schematic created using CircuitLab The circuit is in ...
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52 views

How to figure out the pinout of this embedded netbook (Asus EEE X101h) webcam? [closed]

Sometime ago my old Asus X101H netbook died with a molten cooler fan. I've extracted it's webcam, which I want to use for another project. Now I'm trying to map the pinout of the connector. The ...
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87 views

GFCI red LED fault indicator circuit

Just kindly share what kind of input in the violet dot at center to inject so the red fault led would turn on? When the GFCI no longer function, the red led lights up. I'd like to understand how the ...
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169 views

How to calculate the phase difference between current and voltage?

Using the next circuit and the components of simulate this circuit – Schematic created using CircuitLab \$R=20\Omega\$ \$L=25mH\$ \$V_{DC}=36\$ \$v_{s}(t)=50+\underset{n=1}{\overset{\infty}{\...
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67 views

A contradiction regarding flux conservation

Consider a simple circuit Initially switch S was opened till steady state is reached and then it was closed. My understanding regarding inductors is that you can't have a SUDDEN change in current ...
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46 views

Boost converter output voltage error

I'm using LT3494a to generate 37v from 6v input. This is my circuit. According to the datasheet, this chip can provide up to 40v output, so it should be able to generate 37v. Also, the simulation ...
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Consistent Current Output From Batteries To DC Motors

I'm new to ECE and as a beginner project I've taken apart an RC car and attached an Arduino to the DC motors with an L298N module for control. The goal is for the car to drive a certain path with pre-...
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PNP darlington pair calculations

I have a 20ohms discharge resistor connected to my PNP darlington pair. I have simulated the circuit in my mobile (every circuit app).please find the attachment for circuit. But here I'm unable to ...
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What makes the SCR burnt up?

I removed Pin 1 to trace nuisance tripping of this GFCI circuit, and the SCR blows up: From this circuit: Removing pin 1 will make the pin 7 trigger the SCR continuously. But why would the SCR blow ...
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Switched circuit analysis - getting rid of “glue” equations

I have the following circuit: simulate this circuit – Schematic created using CircuitLab I would like to derive 3 differential equations, describing it, since it has 3 dynamic components [Csh, ...
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Finding resistance and how many appliances can be connected

A household electricity system can be modelled as a fuse in series with appliances, all of which are in parallel across the 240V mains supply. In one household there is a 16A fuse in series with the ...
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Power amplifier, does this circuit work?

I found that circuit for a power amplifier. Does it work? I want to build one for myself.
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How to go about finding the transfer function of a non-linear circuit?

Note: The concept of Transfer Function is only defined for linear time invariant systems. Nonlinear system models rather stick to time domain descriptions as nonlinear differential equations rather ...
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Question about LKC LKV

I was answering probably a simple questions and I dont match the same result using the different method to solve that circuit below: My 2 resolutions: KVL: \$\frac{30-V}{4}+2\cdot I_x-\frac{V}{6} = ...
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How to apply Thevenin's theorem in multivoltage(3) sources?

Here is a question I am not able to tackle as the requirement is to solve it by Thevenin's theorem. The question is to find the value of current passing through 20 ohm. I can perform Mesh analysis ...
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72 views

How is voltage divided between two reverse-biased ideal diodes?

Suppose we have two identical ideal diodes (without any resistance or voltage drop). We connect these two diodes in series, in the same direction, and reverse-bias them with voltage V. Now we have two ...
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113 views

How to construct the DC equivalent circuit of a BJT amplifier

How would the DC equivalent circuit be constructed? I have a vague idea knowing that AC voltage sources are connected to the ground and capacitors are open circuited but what happens to the resistance ...
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Determine the value of Vx if the power dissipated by resistor Rx is 450W and Rx=50 Ohms

I keep getting figures that are out of these ranges. Maybe I am doing it wrong. So far I've been adding the possible voltages with 200V to get a total voltage, then using Ohms's Law to see if any of ...
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72 views

Two-port circuit with input/output duality

Suppose I have a circuit with two ports. One port is considered the input, and the second port is considered the output. Assume it's described via $$V_{out} = \frac{V_{in}}{2}$$ Now assume there's ...
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57 views

Apparent contradiction in AC analysis of BJT amplifier

Suppose you have the circuit: For an AC analysis we can draw the following circuit: Now my job is to find \$v_{out}\$, which can be easily found by: $$ i_E=\frac{v_{in}}{R_E} \\ i_C=-\frac{v_{out}}{...
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98 views

Finding current through an LED in an amplifier using a BJT

Suppose you have the schematic: My job is to find \$I_{LED} \$ knowing that the impedance of the capacitor in negligible against \$V_s\$. Here's my attempt: I intend to do an AC analysis followed by ...
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Find admittance( G ) matrix of a resistive circuit

I am taking Signals And Systems class where I have to calculate the admittance parameter of a given circuit. A given circuit for example: This is tedious and calculating the parameters takes so long....