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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. Consider using in conjunction with tags for the particular analysis technique(s) in question: "nodal-analysis", "mesh-analysis", "superposition", etc.

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automatic submersible pump actuation project

I have a project for automatic submersible pump actuation using a microcontroller. I've done for two voltages like 5 V and 12 V and its corresponding relay. Also, in each board there is a transistor ...
Anil Suha's user avatar
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Need help to identify an unmarked SOT23-5 IC

I have come across a PCB which is a vibration sensor (switch) based motion detection logic, where on any vibration is detected, the circuit will turn on/off a load. It works in same way as a Push ...
Sathish V's user avatar
4 votes
0 answers
342 views

Transfer function of an electromechanical system

In this exercise I am asked to find θc(s)/θR(s), of which I am given the following indications. In the system shown in the figure, the motor is an armature-controlled dc motor, and there is also a ...
Nose3154's user avatar
4 votes
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235 views

Can this Raspberry Pi UPS circuit work?

I created following UPS circuit to shutdown my Raspberry Pi 3A+ properly: I would really appreciate if somebody can review my circuit. I know it's a little bit hard to read, but I'm sorry. I'm a ...
Manuel Neff's user avatar
4 votes
0 answers
190 views

Appoximation of a transient response of a more complex circuit

I have a "complicated" circuit that I want to approximate as a simple harmonic oscillator. More info below. I have a parallel LRC circuit, with some extra input and output load resistors and coupling ...
user2562235's user avatar
3 votes
0 answers
42 views

Find the open-circuit voltage ratio of the following two-port network

This is the circuit: Here's what I have done: I converted the part before the input of the two-port network (1 capacitor and 2 resistors) into another two-port network and derived the transmission ...
Halfy's user avatar
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How does this capacitance measurement op-amp circuit work?

I'm studying this scientific paper where a capacitance measurement is done with the circuit shown at page 3. For simplicity I reported it here: A sinusoidal signal is applied at the input through a ...
Idix's user avatar
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3 votes
1 answer
534 views

Where does the 1 V voltage come from?

I have a PLC with many digital open collector outputs connected similarly to the schematic below. If I use a multimeter and measure the voltage between the two points in the schematic, it is showing 1 ...
Albert Tobing's user avatar
3 votes
2 answers
2k views

How to find new ABCD parameters when reversing 2-port network

I have an ABCD matrix represenataion which is defined as: For such a problem, what approach should I follow in order to organize the new ( reversed) network ports voltages and currents properly. I ...
utdlegend's user avatar
2 votes
0 answers
29 views

PSpice Error: Voltage source and/or inductor loop involving V_Vin

I'm trying to simulate the circuit in Pspice; the first few times it worked. However, I got an error when I tried to create a new page and copy all the circuits on it in order to do some circuit ...
CalvinH's user avatar
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2 votes
0 answers
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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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High pass filter simulation involving loop outside the circuit

I am trying to model a tweeter filter circuit from GR Research's X-CS Encore loudspeakers, more specifically get the transfer function Vo/Vi. I have included an example of how I did it for the woofer ...
Seth Petersen's user avatar
2 votes
0 answers
84 views

What is the purpose of connecting the series capacitor to the low side P- channel MOSFET gate?

The datasheet describes CAOUT as a decoupling capacitor. Not sure how it is so ? My guess on the working of the circuit: When AOUT is high, CAOUT is gradually charged with +(on left) and right ...
Dynamic_equilibrium's user avatar
2 votes
2 answers
273 views

Selecting the proper resistors in a bi-directional level shifter?

How do you calculate the values of R1 and R2 in the circuit for a Bidirectional Logic Level Shifter if the high and low voltages are known? Searching on the Internet I found 10K is a good option to ...
Bob R's user avatar
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2 votes
2 answers
66 views

Dependent current sources in Thevenin equivalent

In this question to find out ZTH, why have we put a 1 A current source? Can't we just short circuit the VTH potential and find the current across that to find ZTH? Source: https://i.sstatic.net/9KVGu....
Ritvish's user avatar
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0 answers
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Design of a DC motor controller

I want to design a control system to a DC motor using descrite component and not IC component. At the aim is to control the speed of that motor, but at the first time I want to design the inner ...
learn design's user avatar
  • 1,020
2 votes
2 answers
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Connection from breadboard to stripboard

I already have my circuit placed on breadboard. Now I need to transfer it on stripboard. My question is I can just transfer the exact same connection and placement on stripboard right? I don't need to ...
Youngiess's user avatar
2 votes
1 answer
487 views

BJT amplifier design

I am trying to design a BJT amplifier with the given parameters and limitations. The circuit is shown below. Parameters: Vcc = 15 V RL = 20 kΩ beta = 180 Vbe(on)= 0.6 V Cµ = Cπ = 0 Limitations are: ...
Aldocest's user avatar
2 votes
0 answers
532 views

Trying to perform transient frequency response with LTspice or Microcap, TL494 compensation

I have tried to do Bode plot of my uncompensated plant by myself in LTspice 17.1, but the result looks strange to me. This topic is a follow-on to this one.. I have no clue why it comes with 290 ...
LinejHonzaCZ's user avatar
2 votes
0 answers
65 views

Can anyone help me find this IC SZ9KH?

I tried looking for datasheet for SZ9KH but can't find anything. I encountered this IC on a board that needed to be amplified. Mostly i want to know how does the amplification works? Is it an op-amp ...
Ali Tavoosi's user avatar
2 votes
0 answers
136 views

How to solve the equivalent circuit of the induction motor?

Let's say I have below given equivalent circuit of the induction motor. The parameters \$R_S\$, \$R_{Fe}\$, \$R_{load}\$, \$X_M=2\pi\cdot f\cdot L_M\$ and \$X_L=2\pi\cdot f\cdot L_L\$ are known and ...
Steve's user avatar
  • 1,103
2 votes
0 answers
68 views

About MOSFET circuit behavior

When I look at the waveforms of simulated circuits, how do I know when their behavior (for example flipping value stored on a node, or an unexpected drop in strong level value...) is due to MOSFET ...
Chengineer's user avatar
2 votes
0 answers
51 views

Sensitivity of Inrush Current Circuit

I'm new to LTSpice and analog design - I'm having a bit of a struggle getting a feel for the behavior of this inrush limiting circuit. Stole the design from another SE post, but playing with the ...
EENewbie's user avatar
2 votes
0 answers
122 views

RHP pole of two stage OTA

I learnt that for any amplifier (with some capacitor) if we short/open the capacitor and the polarity of gain changes, it is a sign of RHP zero. Now, while applying the same analysis I obsevred that ...
sumita sahu's user avatar
2 votes
0 answers
431 views

Current Direction and Voltage Polarity in Capacitor/Inductor Circuits

I believe that this question may be simple for those with a little more experience, but it is still puzzling me. Studying capacitance/inductance, I understand that the capacitor in the DC case behaves ...
benjamin_ee's user avatar
2 votes
0 answers
131 views

Can anyone help me figure out what this circuit does?

I wanted to see if anyone might be able to help me understand this circuit board a bit better. I am trying to trace some issues I'm having with my car stereo and this board is the furthest I can trace ...
Conor Gaines's user avatar
2 votes
0 answers
186 views

Small signal analysis of MOSFET circuit

The other day I got the following exercise on one of my exams: For those who don't speak German, for transistor 1 lambda is 0, but not for the others. The backgate-effekt should be neglected ...
Marcell Juhász's user avatar
2 votes
1 answer
50 views

How to measure 10bit SAR ADC 's input Dynamic range after switch 9 time?

I want to know 10 bit SAR ADC , supply voltage 0.5V , Vcm based , after DAC switch 9 times , how to measure DAC input Dynamic range ? I need to know voltage range that I can use Voltage to time ...
spacemarinegundam's user avatar
2 votes
2 answers
395 views

Ideal Transformer Currents Relationship

I'm currently quite confused with the relationship of the currents for an ideal transformer when it overlaps with multiple mesh currents. It was defined that for: $$\frac{\bf I_2}{\bf I_1}=\frac{1}{n}...
ken's user avatar
  • 21
2 votes
2 answers
103 views

How should fuse selection be made in discrete-time alternating current?

My V(t) signal progresses for hours as 0.75 seconds on,5 seconds off.(Let assume V(t)=I_lamp(t),R_lamp=1 ohm) The general formula for fuse selection at room temperature is: In summary,what should I ...
mike_lay944's user avatar
2 votes
0 answers
370 views

555 PWM circuit set frequency shifting after 2 months

Please refer to post PWM generator circuit review for initial simulation and bugs on the circuit. In general, the circuit works very well and I can control a 12V fan with the PWM output of the 555 ...
RWeiser's user avatar
  • 151
2 votes
0 answers
300 views

finding state space equation in x=Ax+Bu form

Can anyone please help me to find the state space equation of this circuit diagram in the form of x=Ax+Bu? The equation I am getting is not giving me square matrix. Can anyone help please? These are ...
safi2016's user avatar
2 votes
0 answers
76 views

What is the effective value of the current of the voltage generator?

I need help with this task, if anyone had a similar problem it would help me. The task is: A voltage generator is connected to the primary of an ideal transformer, transformation ratio n rms values ​​...
LogicNotFound's user avatar
2 votes
1 answer
69 views

karnaugh table issues

Hello,I have this truth table.I did this table and I am creating a demultiplexer 1 in 2.Not multiplexer. Second,I did and that I gave and those Am I right?I want to confirm that I have done it all ...
ek.Nik's user avatar
  • 241
2 votes
0 answers
1k views

Left half and right half plane zeros

In the common-source on the left, one can solve for the transfer function and see that there's a right-half plane zero at \$s_z = +g_m/C_{gd}\$. For the source-follower on the right, similarly you can ...
HallEffect's user avatar
2 votes
0 answers
156 views

Nonlinear circuit and RLC

I'm trying to solve the following question from "Communication Circuits: Analysis and Design" by Donald T. Hess: For the circuit shown in Fig. \$1.P1\$, determine an expression for \$v_o(t)\...
S.H.W's user avatar
  • 127
2 votes
0 answers
329 views

Time delay in lumped element delay line

I was trying to analyse a lumped element-delay line by changing the frequency and measuring \$ V_{in}\$ , as shown in the graph the goal of my analysis is to find the time-delay and the attenuation ...
Maxwell 's user avatar
2 votes
0 answers
78 views

Voltage-divider bias common emitter calculations are yielding unexpected results

I performed an analysis on this voltage-divider-feedback common emitter. My result in simulation is relatively close, but doesn't quite check out. Where did I go wrong? I'm new to this and ...
nuggethead's user avatar
  • 1,139
2 votes
0 answers
79 views

How does this timer 555 and transistor circuit work?

Is this the way this circuit works ? If vref = 5v on the pin #5, then Vthreshold = 5v, and Vtrigger = 2.5v With Vthreshold = 5v, if voltage on pin #6 Vp6 > 5v, then Vp3 is Vo = 0 With Vtrigger = ...
Samu R's user avatar
  • 215
2 votes
0 answers
50 views

Proving the state of a diode in a clamping circuit?

simulate this circuit – Schematic created using CircuitLab So i have this positive clamper right here. So the diode will be ON at a negative source voltage since the anode side will see 5V which ...
user avatar
2 votes
0 answers
54 views

Adding Line Out / Sub Out to LG soundbar

I have LG Soundbar with wireless sub. I am trying to add Line output, so i could connect a wired sub. I took some pictures of the boards and chips. If someone could point me in right direction on ...
user3365751's user avatar
2 votes
0 answers
126 views

How do I find Vs in this circuit with a 2:1 ideal transformer?

How do I find Vs given that V0(to the left) is 10L30degrees? I started by finding that the current on the 10 ohm resistor is 1L30 degrees, and then using kirchoff's law, the current on the tranformer ...
guib's user avatar
  • 23
2 votes
0 answers
246 views

Need help for pointing out, source follower circuit with current source, designing NMOS

I'm not sure did I solve this problem right. I made \$ r_{o2} \$ , which is resistance looking at Q2 drain. So I can get $$ g_{m,Q3} = 1.8m(A/V) $$ from $$A_v = \frac{r_{o2} || r_{o3}}{1/g_m + (r_{o2} ...
Pare Kanes's user avatar
2 votes
1 answer
138 views

How to explain the peak frequency and resistance relationship in this op amp circuit?

I was studying thid tutorial by Simon Bramble. I changed the original circuit a little bit and this is the subject of our discussion: As you see, R1, R2 and R3 are all 1kOhm. When I run an AC ...
alpersunter's user avatar
2 votes
0 answers
52 views

Computing the maximum power that this opamp provides to the load Rl without occurring distortion

Here's the schematic: So first stage is a differential amplifier where vo1 =3.72V in DC (Vin= 0). In this stage i can say AmplVo1 = gainStage1 * AmplVi where distortion only happens when vo1 is ...
Scipio's user avatar
  • 803
2 votes
0 answers
169 views

Problem understanding transfer functions of second order filters

The transfer function of any second order filter can be found by analyzing the circuit using the Laplace transform. For example the transfer function of a second order low pass passive RLC filter ...
Jack Danniels's user avatar
2 votes
0 answers
106 views

Are there errors in the description of this circuit?

Background The circuit describes the operation of a variable voltage power supply. In the description below the circuit diagram there are errors. Read through the description and note down any errors....
John's user avatar
  • 131
2 votes
0 answers
40 views

Electric power of the light bulbs in a circuit with diodes

Let \$R_1 = 1 \: \Omega, R_2 = 2 \: \Omega, R_3 = 3 \: \Omega, ...R_{10} = 10 \: \Omega\$ be the resistances of the light bulbs depicted in the circuit below and let \$U = 2 \: V\$ be the voltage of ...
tomashauser's user avatar
2 votes
0 answers
148 views

Trouble understanding how dependent current sources affect a circuit (Two-port networks)

While reviewing a problem from my recent test on two-port networks I noticed that it made its way online. When someone was explaining the solution they utilized a point that I just completely missed. ...
SerasVita's user avatar
2 votes
0 answers
195 views

First principles modeling of op amp CMRR

Introduction I'm trying to analyze an op amp circuit from first principles (i.e. without using the two rules of ideal op amp analysis -- virtual short circuit and infinite input impedance). The ...
swineone's user avatar
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