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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RLC state space model

I tried to do the state space model of the following circuit, but I do not know if it’s correct or not. Could anyone confirm if my representation is correct or show me where are the mistakes.
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Distortion pedal volume and tone control messing up circuit

I have built a distortion pedal with 3 variable controls: gain, tone and volume. R8 is my gain control (it will be a potentiometer with 50k to 500k resistance.) R5 is the tone control, (low pass ...
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AM single sideband modulator

I am doing a AM single side band modulator that can help to produce a single sideband from a spectrum analyzer. But now even i had follow the rules to build a modulator, the output still not showing a ...
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Using complex impedance

Any help getting the answer shown here? I have tried adding the complex impedance of L and R in series and then adding that to C in parallel. I'm not super sure about that last step, and then ...
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Active inductor

I am designing active inductor using OTAs (Transconductance amplifiers) and have a problem writing an equations. I wrote two equations for nodes V2+ and V2- and input current Iin. $$ 0=sCV^+_{2}+g_1(...
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diode clipper circuit [closed]

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Grounding sensors to large bodies

I've attached a diagram of what I'm talking about. I have a large (600x300x10 mm) aluminum block in which I place thermistors to monitor the temperature distribution in the plate (in a standard ...
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With given impedance matching network, how to find the possible matchable load impedance range

I have some questions regarding this schematic using Keysight ADS here. The matching network is intended to function at 13.56MHz. The shunt capacitor has a range of 150-1500pF capacitance and the ...
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Maximum current going through a solenoid

L1 and R3 represent a solenoid in the schematic below. In my textbook, it's mentioned that the maximum current through the solenoid can be approximated as the voltage supply (Vcc) divided by the value ...
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How many loads can I have on an open drain output?

So I am using this AND gate which has an open drain output. I am trying to determine how many loads that I can place on this output. I see in the datasheet, that the Iol is over 1mA, but I am unsure ...
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Thevenin's theorem for Voltage divider bias

I am calculating the base current of transistor Q1. To simplify the circuit equations, I applied the Thevenin's theorem and converter V1 and R1, R2 into Vth and Rth as shown in the image. Vth= V1x(R2/...
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Confusion In RC circuit

I want to calculate voltage across the resistor. I divided the circuit into two parts: Charging=0<t<1, 2<t<3, 5<t<6(ms)... Discharging=1<t<2,4<t<5,7<t<8(ms)... $$...
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Op-amp exercise [closed]

R1 = 6,8kohm R5 = 470ohm R10 = 1,8kohm Hello, I'm having trouble to find the gain of this circuit. I know that U1 and U2 act as buffers and the output from both op-amps are vid. I've tried to find the ...
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How would I get the solution for this question? [closed]

The 10kHz frequency mentioned in the question was wrong and was meant to be in rad/s. The resulting capacitor value is supposed to be 464 but I can't seem to get this answer, I know we need to use kf ...
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1 answer
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Series and Parallel Capacitors in Circuit Analysis

In the circuit below: I performed my calculations considering: $$\frac1{C_{eq}}=\sum_{k=1}^N C_k^{-1},$$ and $$C_{eq}=\sum_{k=1}^N C_k,$$ when the capacitors are in series and when they are in ...
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Base resistor too low problematic?

I have recently designed and ordered some PCBs which can combine a horizontal and a vertical video sync signal into one composite sync signal (all are TTL signals). This is done using a BJT circuit ...
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How would you find the impedance of this circuit? [closed]

I am working on a project using C++ to find the impedance of a circuit. In implementing the program I have realised that the program cannot find the impedance for a circuit of this type. My intuitive ...
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How to derive effective transconductance versus oscillation amplitude in a oscillator?

In the page below in the lecture note shows a plot of effective transconductance versus oscillation amplitude. How is it derived? Or is there any source to derive effective transconductance versus ...
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Distortion Pedal Design

I am building a guitar pedal and came across a reference design here: https://www.wamplerpedals.com/blog/uncategorized/2020/05/how-to-design-a-basic-overdrive-pedal-circuit/ I'm not sure why the ...
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How do I find the gain function for this circuit?

The cicuit shows a high order low pass filter, where the voltage is 240V RMS. I was told to use laplace to find v0/vi but i am still confused on how to get this and solve for the circuit as asked. I ...
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2 answers
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Peak current of inrush limiting inductor?

I have this tricky question and I can't wrap my head around it. There is this inductor to limit the inrush current that will be charging up a capacitor. I'm questioning the design of it, but I don't ...
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Can this circuit with two resistors oscillate?

From this lecture note. Can this circuit oscillate as what the lecture said? I did simulate this circuit in LTspice but it doesn't work. The step from 1V to 0V does have many frequency components ...
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How to find noise sources from noise figure data?

An amplifier datasheet provides noise measurements that show it has a noise figure of 3dB for R_s = 100Ω and R_s = 10kΩ (same noise figure for both values of R_s) at T=300K and f=10kHz. I need to ...
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1 vote
1 answer
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Finding the "drop in potential" as current moves through a single resistor of a circuit with parallel resistors

I have four different resistors connected in parallel to a \$24.0 \ \text{V}\$ battery with internal resistance of \$0.500 \ \Omega\$. The resistor values are \$10.0 \ \Omega\$,\$15.0 \ \Omega\$, \$30....
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Finding the voltage available at the terminals of the battery in a circuit with parallel resistors

I have four different resistors connected in parallel to a \$24.0 \ \text{V}\$ battery with internal resistance of \$0.500 \ \Omega\$. The resistor values are \$10.0 \ \Omega\$,\$15.0 \ \Omega\$, \$30....
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2 votes
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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 ...
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1 answer
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Finding resistance for parallel resistors: how is my reasoning incorrect, and what is the correct reasoning?

I have the following circuit: The voltmeter \$V_1\$ measures the voltage drop across the \$9.00 \ \Omega\$ resistor and has a reading of \$4.50 \ \text{V}\$. The reading on ammeter \$A_1\$ is \$I_1 =...
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Calculating the reading on ammeter \$A_1\$: why am I incorrect?

I have the following circuit: The voltmeter \$V_1\$ measures the voltage drop across the \$9.00 \ \Omega\$ resistor and has a reading of \$4.50 \ \text{V}\$. I am trying to calculate the reading on ...
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How do I find Vo in the circuit?

I1 + I2 = I3 I1 = Vi/Z1 ... Z1 = (1+sCR1)/sC I1= Vi(sC)/(1+sCR1) I2= Vi/R1 I3= -Vo/R1 I1 + I2 = I3 Vi[(sc)/(1+sCR1) + (1/R1)] =-Vo/R1 -Vi[(R1sC)/(1+sCR1) + 1] = Vo How do I change back to time domain?
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How to create 4-bit asynchronous counter?

I am new to Multimedia Logic and am trying to create a 4-bit asynchronous counter. I did something like this, but it doesn't work. I'm not sure if everything is properly connected and if I was using a ...
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Why is each time constant in this transfer function equal to "open circuit" time constant not "short circuit" time constant?

From this lecture notes, the open circuit time constant approximation: How to prove the yellow part? The lecture note mentioned Richard Adler at MIT did prove this but I could not able to find his ...
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How to sketch the waveform of the voltage across capacitor and find equation that describes it? [closed]

Below DC voltage source, a switch, resistor and capacitor. At time \$t=0\$, \$C\$ has zero voltage across it and switch is closed. How do I sketch waveform of voltage across capacitor v/s time and ...
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Where are the transistor number 18 and 21 in op amp 741 according to Wikipedia?

I was trying to implement this op amp from Wikipedia in Proteus : Like this: But I could not find Q number 18 and 21. What is the reason that there are not Q number 18 and 21? Or if this image is ...
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Why does my oven trip the kitchen circuit fuse? [migrated]

After a recent refurb where some of the electrics were also changed (including consumer unit and a full rewire), I noticed that when using the oven it would sometimes trip the kitchen fuse. Where ...
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2 answers
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Is my circuit analysis correct?

This is the circuit. It is assumed that beta is 99 and VBE=0.7 V for both transistors. Here is what I've done. Multisim confirms the first set of values I worked out regarding Q1. However it does ...
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1 answer
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Find the voltage drop across the capacitor in the LRC circuit

I am having issues finding the voltage drop across this capacitor in the circuit attached. Attempt: The impedance of the inductor is 50j ohms, and the impedance of the capacitor is -j20 ohms. This ...
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1 answer
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Help me to understand the output signal of this circuit

I want to understand the output voltage of this circuit. My analysis is: When we are in the positive half of the wave, the capacitor will charge and the current will flow through D1 after it goes to ...
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Is there any method to turn any PWM DC-DC converter to its small signal model at circuit level?

Is there any method to turn any PWM DC-DC converter to its small signal model at circuit level? As I know the PWM switch model does that well but it only applies to simple circuits and the switches ...
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Find the voltage across the dependent source

I was trying to do some first order circuits and there was this one that kind of confused me. Correct me if I'm wrong but if $$V_s=u(t)V$$ this means that for t<0 Vs=0 and for t>0 Vs=1 right? So ...
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2 answers
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Does anyone know why this diff amp isn't working?

simulate this circuit – Schematic created using CircuitLab I'm new to electronics and I've been figuring out how a diff amp works. I followed a schematic I found on YouTube. Basically, as V3 ...
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3 answers
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Resistance measured individually vs measured on PCB

I always wanted to ask this question. Suppose I have a 1kohm resistor. I measure its resistance by connection a multimeter to both of its terminals (when it is not connected to any part of a circuit.) ...
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3 votes
1 answer
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Is there any meaning attached to the Zener diode symbol?

Is there any meaning to the Zener diode symbol? The triangle is similar to a normal diode which originally indicated current flowing in one direction only. Is there any hidden meaning to the yellow ...
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Fault analysis- per unit query

im trying to do fault analysis on image 1. I was little confused for the line as there wasnt a j component so unsure how to find the pu. In images 2 and 3 show a line with R+jX and the R id ...
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Resistor in parallel across a capacitor

I was working through a problem involving two cascaded integrating op amps with feedback resistors with a DC step function as input. The book asks for the current flowing from the capacitor in the ...
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2 answers
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How to find the voltage on each of the parallel resistors? [duplicate]

Suppose we have a circuit like this: It is easy to find the voltage on the node shared by the two parallel resistors, we simply have to find their equivalent resistance and use KVL. But the problem ...
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2 votes
1 answer
152 views

I'm not sure my circuit analysis is correct

I'm an electrical engineering student. I analyzed a circuit, however I'm not sure I analyzed it correctly. This is the circuit. I'm asked to find the voltage drop between the bases of QN and QP. Base ...
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3 answers
159 views

Question on RC circuit.(Texas Instruments interview)

I have confusion in this circuit. I know at t=0 both capacitor charges instantly. and voltage divided between both capacitors equally. but after some time output loop start active and capacitor C1 ...
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I can't figure out what this circuit does

I'm an electrical engineering student. The picture below shows a circuit that I found in some old notes but I cannot figure it out. I have been at it for the last 2 days but to no avail. Some things ...
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1 answer
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How can KCL be satisfied here?

In the transistor biasing using diode below assume that at time t1 the circuit is stable and apply KCL at the junction of the three devices you have: ...
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FoldBack Desing [duplicate]

I'm having a problem designing a foldback. I need it to have an opamp and a transistor. The problem is that the models I've been looking at don't work. I have to fulfill that for Imax=1.5 amp, go to 0....
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