Questions tagged [circuit-analysis]

Circuit (Network) analysis is the process of finding the voltages across, and the currents through, every component in the network. Consider using in conjunction with tags for the particular analysis technique(s) in question: "nodal-analysis", "mesh-analysis", "superposition", etc.

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Analysis of Logic Gates (BJTs) [closed]

Q1: You are required to design a 2-input modified-DTL circuit and analyze its characteristics. Choose a realistic model for NPN transistors and diodes (do not use the default models). And prove the ...
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Consider the following circuit system (RLC Circuit, R and L parallel then series with C), please determine the transfer function

i'm trying to figure this out, but i'm still confused. Can anyone help me? Thank you
Kevin18's user avatar
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Why do linear components make linear circuits?

We can use the concept of linear circuits to simplify circuit analysis (e.g. superposition & Thevinin’s theorem.) In order to do this, we need a simple way to identify linear circuits. I believe ...
Fascheue's user avatar
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How to analyze ideal diode circuit

For the first part of the problem, I have figured out that when Vs = 60 V, Vo is 50 V when D1 is reverse biased and D2 is forward biased. The question also asks to find Vo when Vs = -60 V. This is ...
salsa_24's user avatar
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Using the wrong scale in a multimeter or ammeter. Does it break? [closed]

Multimeters have a wheel to chose the scale of the current you are measuring. If I put the wheel on the µA and plug it into a 1A current, let's say, Does it break? Does it depend on being a digital ...
Martín Montoto Fernández's user avatar
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Calculating the instantenous current [closed]

If the circuit is connected to a voltage source of 2sin(2t+-9°) and C=8 F, R=9 Ω and L=1 H. Find the instantaneous current flowing in the circuit flowing in the circuit at time t=0.07 seconds.
Juwa 's user avatar
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2 answers
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Determining the region of operation of these two diodes

I'm having trouble determining the region of operation for these two (ideal) diodes. Do I check the Vopencircuit values or their current values?
user364328's user avatar
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STM8S001J3 not responding

I am using an STM8S001J3 in a project as shown in the above circuit. I am trying to program it using the below code using IAR and programming it using STVP. STVP gives successful message, but the ...
JSNerd01's user avatar
2 votes
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Negative PSRR of Two-Stage Op Amp

From page 4-9 of this lecture note https://pallen.ece.gatech.edu/Academic/ECE_6412/Spring_2004/L180-PSRR-2UP.pdf, it gives example on how to model a Two-Stage Op Amp to find the PSRR- when \$V_{Bias}\$...
Matt's user avatar
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Transimpedance amplifier with parallel RC

Consider this circuit. Since a constant current source is present, the output voltage will always be $$V_o=i_sR_f$$ However, you can also drive $$i_s=i_c+i_R=C\frac{dv_c}{dt}+v_c/R$$ Then you can say ...
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How to emulate effect of mutual inductance?

Background I don't have any background in electrical engineering. My knowledge is very superficial. I am simulating a circuit which has mutual inductance between two components. However, the software ...
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Do you know about topologies that look like this?

I'm working on a new topology. I looked it up myself, and it says "3-level boost converter" has a low inductor. Is this right? How do I search it?
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How to solve Thevenin and Norton circuit?

This is the circuit for the problem in finding Vth and Rth. Analyzing this circuit yields Vab=−35V and Ia=0. If 10V is connected to Vab, then Ia=1.125A From what I remember, you need to short the ...
mama b's user avatar
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2 answers
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How to go with this RC circuit?

So, i've been asked to get the differential equations (or model) for this circuit: V1=15 u(t)V, R1=10 ohm, R2 = 20 ohm, C1=10uF, C2=20uF I'm just a beginner, and don't know if the differential ...
Nicolas Guevara Herran's user avatar
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2 answers
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Understanding how to read current direction when it is opposite to voltage direction [closed]

I need to completely understand how to find the value of each resistor in this circuit. I understand that with R1: i1 and V1 flow in the same direction and Ohm's Law can be directly applied but could ...
9_daytona's user avatar
4 votes
7 answers
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Why is capacitor equilibrium based on balanced voltages and not balanced charges?

The problem below is from the electrical circuits chapter of Essential University Physics Volume 4. I am having trouble understanding the essential idea behind the solution. I initially tried solving ...
Saveer Jain's user avatar
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KVL and KCL circuit [closed]

] can anyone help with that question?
Kyrillos Amgad's user avatar
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Schematic for auto phase selector

Can someone check the response of the schematic of auto phase selector switch, wherein MCU will read all the AC inputs of 3 phases accurately and make perfect decision for the healthy phase for the ...
Atish's user avatar
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Power over Coax (PoC) filter design calculations

I need to design a PoC filter for one of my project. I am referring this document for the same. Below is the PoC filter given in page in 13. I am using only TI parts. This document is from TI. This ...
Hari's user avatar
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1 answer
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Slight difference in equations for the design of resistive matching network

I'm currently reading trough an application note from Analog Devices 2, in particular the "A NARROW-BAND LC MATCHING EXAMPLE AT 100 MHz" section. I re-did the calculations by hand and got ...
squeakyclean's user avatar
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2 answers
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What is the equivalent resistance between A and B?

I was solving this problem: As it appears, this is a collection of resistors put on the sides of trapezoidal pyramid. I have solved this problem and my answer is \$ \frac{12R}{35}\Omega\$, but the ...
Jack's user avatar
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1 answer
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Solve problem about voltage drop [closed]

Can you please help find the voltage drops at 8 Ω and 20 Ω? Reference below.
Chatchavan Kamluecha's user avatar
2 votes
2 answers
1k views

Function of capacitor on the output of a bridge rectifier

What is the function of capacitor C in this diagram?
Kim Sr Luy's user avatar
0 votes
3 answers
97 views

DC circuit and capacitor

What method should I use to calculate the voltage across C1 and C2 in the following circuit in DC conditions? I've already tried using KCL, but I'm confused with what point on the circuit to use. Is ...
Agatha Hadasa's user avatar
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2 answers
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Initial condition across capacitor - RLC

The switch has been in the original position for a long time and is flipped at t=0 (apologies for my drawing skills) I am trying to find the initial condition across the capacitor. I am confused ...
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Is this modified or pure sine wave...or something else?

I have a 12 volt dc to 120 volt ac inverter built into my custom van. I've been curious if it produces a modified or pure sine wave because I have a need to occasionally plug a ebike battery charger ...
HLM's user avatar
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0 votes
2 answers
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How to perform Kirchhoff's Voltage Law on an open circuit? [closed]

I am wondering how to perform KVL on an open circuit. For V_s = 10V, I have determined the V across R2 to be 10 Ohms but am confused about R3. The algebraic sum of the voltages around any closed loop ...
9_daytona's user avatar
0 votes
1 answer
115 views

How to figure out the schematic inside a "black box" if the only information I have is the signal equation: U(t) and I(t) [closed]

Professor gave us a problem and I can't seem to figure it out. The task seems quite simple: we have a black box that has some kind of RLC circuit inside it, one input wire and one output wire ...
hakkulinen's user avatar
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1 answer
31 views

DS90UB926QSQNOPB Power down control using Microcontroller GPIO

I am using DS90UB926QSQNOPB in my design.This is a 24-Bit Color FPD-Link III Deserializer With Bidirectional Control Channel.I have a question regarding Power-down Mode Input Pin. Below is the ...
Hari's user avatar
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2 votes
1 answer
128 views

Is it possible to receive an FM signal without a tank circuit?

I was broadcasting FM signals at MHz frequencies in my room. I know that an AM radio will not work to receive FM transmissions. The special issue is that an AM radio can get any AM signal without a ...
lastime's user avatar
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3 answers
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If I connect 3 12V batteries in parallel to eachother, then connect them to the load, am I connecting to the Load in parallel or series?

I have 3 12V batteries. I have connected the 12V batteries in parallel to each other. I have 1 positive lead and 1 negative lead coming off to my motor. Am I connecting to that motor in parallel or in ...
RB96's user avatar
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0 answers
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Equivalent Circuit of Induction Motor

To find the equivalent circuit of the rotor side of an induction motor, the resistance and the reactance changes to ensure that the current in the rotor remains the same, whilst removing the slip term ...
Jonathan Lee's user avatar
-2 votes
0 answers
40 views

Diode / resistor networks and output voltage

[![enter image description here][1]][1] ** ALL THE VOLTAGES AT THE BOTTOM THAT ARE CUT OFF ARE -3 V** Using piece-wise model for diode I am using the equation Vd = Vdo + Rd*id and Ohm's law to find Vd ...
user364328's user avatar
3 votes
3 answers
320 views

Where do Data in /Out, Write Enable, and Read Enable Wires connect to in RAM?

This is a screenshot of the Crash Course Video Registers and RAM #6. From YouTube, here's the link "Crash Course Video". It's talking about using Gated latches to store memory, and putting ...
user14232195's user avatar
0 votes
1 answer
73 views

Power over coax circuit clarification needed

The below image is taken from DS90UB913A-CXEVM Serializer Board Schematic. T he complete schematic is on page 21. The PoC network is enclosed in an orange box. You can see that two resistors (R28,R71)...
Hari's user avatar
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1 vote
4 answers
117 views

How to determine in a nonlinear circuit with multiple diodes which diode is ON vs which one is OFF? Does it depend on the orientation of circuit?

This problem is from the Sedra Smith Microelectronic Circuits textbook 7th edition. There are solutions available online but I am having trouble how they determined that in part b, D1 is forward ...
user364328's user avatar
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0 answers
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Could any of the following components produce an erratic waveform when they fail? [duplicate]

If I am looking at current through an ammeter inserted between the negative battery terminal and the negative circuit lead, could any of the following produce an eradic waveform where the current ...
WackyTortoise's user avatar
5 votes
4 answers
498 views

When to have a pathway to ground in op-amp/comparator input?

When having a comparator IC, when should I put a resistor in series, to ground, or neither? I have three examples below: I understand ex1 may be useful to reduce offset voltage due to offset current. ...
ludicrous's user avatar
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1 vote
1 answer
77 views

How to obtain the relationship between input and output in a two-stage n-channel MOSFET amplifier?

I have a difficult time with calculations related to a two-stage MOSFET amplifier. This post is kinda long because I go through my calculations. However, to cut to the chase, I would like to know how ...
xoux's user avatar
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1 vote
1 answer
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How do I orient the "outlet" side of a voltage stepdown converter relative to the connecting circuit?

I've created a circuit diagram for a wheeled robot. This is my first circuit diagram as a mechanical engineer, and I'm a little confused on the current flow convention for the voltage stepdown ...
Benjamin's user avatar
0 votes
1 answer
51 views

Transfer functions to determine voltage of a similar circuit

Goal is to solve for the voltage u2(t) I'm somewhat confused by this. I solved the transfer function Z(s) earlier in the top circuit, which is simply just Z. The voltage across Z in the top circuit is ...
JohnnyB's user avatar
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1 vote
1 answer
121 views

Analysis of NAND-based low-power monostable circuit

I've seen a monostable multivibrator circuit shown below. The purpose of the circuit is to provide a power to a circuit for an amount of time controlled by potentiometer after pressing the momentary ...
JSK's user avatar
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3 votes
1 answer
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Comparator not giving H when sine wave is positive

I have an LM311 with a single supply and an amplified signal which has AC 8Vpp and is centered at around 8V. In the schematic below, I represented the signal as a composition of 8V + 4sin(wt). I want ...
ludicrous's user avatar
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0 votes
2 answers
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Currents in short circuit wires connected in parallel

simulate this circuit – Schematic created using CircuitLab There were two inductors at I1 and I2 which at steady state became short-circuited. What would be their currents? I am confused as to ...
Bruce Wayne's user avatar
3 votes
2 answers
607 views

What is an intuitive explanation for why the power supply in this MOSFET circuit does not affect the output voltage?

Consider the following circuit Let's name the top MOSFET m1 and the bottom one m2 for brevity. Assume that both MOSFETs operate in the saturation region. \$L_1,W_1\$ are the dimensions of the n-...
xoux's user avatar
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6 votes
6 answers
291 views

Effect of Vbe on Ic for a BJT

I am trying to find out where I have gone wrong in my understanding of BJTs: According to the Ebers-Moll equation: $$ I_C = I_S\cdot (e^{ \frac{V_{BE}}{V_T}}-1)$$ So if VBE decreases, then IC should ...
Xavier's user avatar
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4 votes
3 answers
1k views

Timer circuits - difficulty analyzing

I'm looking for timer circuits without 555 IC and trying to understand them. There are some examples that seem easy to understand, but cannot wrap my head around the others. simulate this circuit &...
steve d.'s user avatar
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1 vote
1 answer
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Obtaining transfer function

In the above circuit j(t)=u(t)A, where u(t) is the step function. Z is a component/circuit system with no independent variables and all initial values zero. The goal is to find the transfer function Z(...
JohnnyB's user avatar
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1 vote
2 answers
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NOT gate using triodes

I can't understand the functioning of the circuit of a NOT gate using a triode (vacuum tube) and a resistance (big rectangle connected between the triode's anode and the positive power supply). For ...
Aleksei Koshelev's user avatar
1 vote
3 answers
224 views

Fourier circuit analysis of a RLC circuit

I was trying to calculate output voltage across the inductor in the RLC circuit below. I had used the Fourier transform to convert input signal \$V_{i}(t)\$ which is a single rectangular wave pulse in ...
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