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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MOSFET in saturation derivation

Consider the following circuit. Assume the op-amps are ideal. Further, assume that each MOSFET operates in saturation, and that, for simplicity, VT=0 for each MOSFET. Thus, for each MOSFET, \$~~~i_D=\...
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Capacitor in AC op-amps

Need clarification on why is a capacitor connected in AC op-amps but not in DC? And what does this capacitor do?
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Choosing op-amps

I am choosing an op-amp to receive a 50kHz 0.5Vpp signal and amplify it with a gain of 50. What parameters/factors do I consider when choosing between different op-amps. All I know is the slew rate of ...
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Polarities when expressing currents in terms of node voltages

This question is specifically about node voltage method. In this example I subtracted the nodes (Vth - V1) / R2 in order to express the current over R2. It seems to have worked out as my calculations ...
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How to choose resistor values in an op-amp [duplicate]

So my question is, in an inverting closed-loop op-amp, what should be the value of my feedback resistor and the resistor at vin? For example if I want my gain to be 20. And the gain=Rf/R1, whats the ...
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58 views

Gain Bandwidth Product on an op-amp

Just wanted to ask how the GBW of an op-amp affects its operation. If I am given a 2 Op-Amps with different GBWs, do I choose the one with higher or lower and why?
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Saturated voltage of LF351 op-amp

So the LF351 has an output voltage swing of typically 12V. To achieve an undistorted output waveform, output swing should be lower than Vsat. How do I know what the Vsat is? Its not mentioned anywhere ...
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191 views

How to choose resistor values in op-amps

Ok so my question is what resistor values should I choose for this amplifier. Vin is 0.5Vpp, 50kHz and the desired Vout is 25Vpp, so the overall voltage gain is 50. I know that the voltage gain for an ...
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74 views

Buck-Boost Converter Modeling

I wanted to perform AC analysis for a buck boost converter using SIMetrix/SIMPLIS for simulation, using this simulator the designer does not need to the average model to get the frequency response of ...
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1answer
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Sinusoidal steady-state analysis

Find the Transfer function of the given circuit in the frequency domain.The problem here is that the equations of this circuit become complicated by finding equal Z of R,C,L (right side of the circuit)...
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Need help on my circuit

This is my circuit that was made on tinkercad. The issue is that 7408 is blowing up every time when 2 switches are on but three switches it works. I just needed advice on how to fix this. At the ...
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Comparing 2 op-amps to find out which one is most suitable to use in circuit design

Ok, so I am designing an amplifier using an op-amp to produce the same undistorted output sinusoidal wave across a 2Kohm load as that of the common emitter amplifier shown in the attached picture. I ...
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Computing the voltage drop across a resistor in a complex circuit? [closed]

For example, how would one compute the voltage across R4 in the circuit below? The original question: as in the given figure the voltage across 5 ohm resistance is ...
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Computing Voltage Drops in an AC Circuit

Compute for the theoretical voltages across the resistor and inductor for 10 kHz in polar form. (1.23 kΩ, 5 V RMS, 3.3 mH.) I don't know where did I go wrong, my answer is very far from the data that ...
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1answer
58 views

Thevenin Equivalent of circuit

I have a circuit that looks like the following. It appears to be simple- What's the thevenin equivalent? I can't seem to simplify it as there are no common nodes that any of the resistors connect.
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Understanding of two stage DC coupled complementary amplifier

I am struggling with an complementary amplifier and unable to compute the value and equations. My target is to identify the working of the circuit, its total gain and equations. After studying many ...
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2answers
52 views

Shift and enlarge voltage out of DAC

I have a DAC that can provide voltages between 0-2.5 V and I need a -12.5 - +12.5 sine wave. I am not too steady on the circuit calculations. Would it be possible to amplify by 10 and set the positive ...
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1answer
36 views

Type 3 compensator design

I'm about to simulate a voltage mode buck-boost converter. To stabilize this converter, it is well known that we should use a type 3 compensator. The configuration of that compensator is given below ...
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How would this circuit work? Would the LED behave like a strobe?

I have placed a simple picture of the circuit I am trying to determine the behavior of. It is just a simple voltage source like a battery in series with a capacitor in series with an LED. To my ...
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208 views

AC-coupling capacitor destroys output signal?

As you can see I have designed a simple buffer circuit with a current source. The output is nice and steady as you can see (\$V = 2.6+1.6\sin(2\cdot\pi\cdot 1000\cdot t)\$ is the input, frequency of ...
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Difference Between Elmore Delay and OCTC Method

I have the following RC network I want to get a delay estimate for (drawn two different equivalent ways): simulate this circuit – Schematic created using CircuitLab Assume \$R_1=R_2=...=R_n = R ...
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3answers
66 views

Circuit Analysis and Voltage

I'm trying to get a better understanding of the node method for circuit analysis. I understand the process, but I'm trying to verify that each step in the method is consistent with my overall ...
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4answers
832 views

GND pin of a RF device

I have a doubt about how to connect the following device (a RF power meter, AD8318) to the external circuitry. Let's consider the device: There is the input RF coaxial cable, the power supply ...
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1answer
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Determine the nodal voltages in the circuit

This is a practice question from book: Engineering circuit analysis / William H. Hayt, Jr., Jack E. Kemmerly, Steven M. Durbin. — 8th ed. (pag. 91) . Determine the nodal voltages in the circuit: Ans:...
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Can a faulty motor cause issues to another motor?

This is regarding the circuit of my 3D printer mainboard. I had an obersvation: It has a cooling fan (40X10 24V) which is having issues lately - it stops working sometimes, and when pushed to rotate, ...
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35 views

calculate output current caused by two sources

This is a common source degeneration with i1 and i2 are two current sources to model noise generated by the transistor and the ...
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1answer
37 views

RC low pass filter difference with RC high pass filter

This is a low pass filter: simulate this circuit – Schematic created using CircuitLab This a high pass filter: simulate this circuit If we add a load resistor to the high pass filter it ...
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1answer
160 views

Why is this two-inductor circuit first order?

I have the following circuit with two inductors. Apparently this is a first order circuit (judging from my solutions for \$ i_1, i_2\$; and circuit simulations) but it's not intuitively clear to me ...
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45 views

The phase of voltage across a resistor in a RC circuit when the frequency of input tends to zero

Across the resistor we have $$ \begin{array}{c} V_{R}=\frac{V_{i n}}{\left(R+X_{C}\right)} \cdot R \\ V_{R}=\frac{V_{i n} \cdot R}{R+\frac{1}{j \omega C}} \\ V_{R}=\frac{V_{m} R j \omega C}{j R \omega ...
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Solve differential equation for R-L circuit

Given that Ri+Ldi/dt=Vsin(wt). The answer given here is i= (V/Z)[sin(wt- Φ) + ke^(-t/τ)]. I could not solve this equation further.
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What happens if the secondary of an ordinary transformer is left open?

Let's consider a transformer. The ideal transformer equation is: $$\frac{V_1}{V_2} = \frac{I_2}{I_1}$$ Suppose the secondary is open (that means \$I_2 = 0\$): it will result \$I_1 = 0\$. How is this ...
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Can USB-C cable/port become corrupted and only transmit partial power/data? Or would it stop working completely if broken?

I plugged my usb-c cable into my device pretty roughly and felt/heard something crumple, and I'm thinking I may have damaged it. Everything seems to be working fine though, but I'm worried that its ...
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How does this circuit startup?

This circuit is from an Elenco AM/FM Radio kit. How does this circuit start working when the 9 VDC power, at the top right of the schematic, is applied? Specifically, what puzzles me is the "...
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70 views

How Do You find The Cutoff Frequency of a Low Pass Filter?

A lowpass filter exists around R1,R2,R3 and C2 but how would you find the cutoff frequency? I think that you have to first find the Thevenin equivalent circuit and this is what i got: RTH = (R1//R3)//...
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What can this circuit be useful for? [closed]

I have calculated the boolean functions for r and f: f = (¬s1 ∧ s0) ∨ (s1 ∧ ¬s0). ...
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Convert expanded boolean function into a switching matrix

I am given a boolean function f(x) that I have to develop them according certain variables, let's call them a0 and ...
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1answer
88 views

Draw curcuit by transfer function

Using one operational amplifier, draw the circuit of an amplifier with the following transfer function: Vo = 6V1 + 3V2 + V3. Using one operational amplifier, draw the circuit of an amplifier with the ...
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Ignoring nodes/wires when combining resistors to find equivalent resistance

Is the 2nd step in the solution sheet wrong? I don't know how they can just ignore the node where the 9 ohm resistor and the 12 ohm resistor were located. Wouldn't current be branched/divided when it ...
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1answer
35 views

Confusion Between Dual Capacitor/Inductor Circuits

I'm trying to physically understand the responses of this pair of (dual) circuits: a step current source driving a capacitor and a step voltage source driving an inductor. simulate this circuit &...
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Problem with powering a high and lower power circuit

I have a problem with the following circuit. simulate this circuit – Schematic created using CircuitLab I try to turn on a normal 120V light bulb controlled by a relay activated by a low power ...
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5answers
63 views

How do the collector and emitter terminals of a BJT operate when no power supply is present?

let's consider an example of transistor amplifier: Let's consider the case in which power supply is not connected (so between VCC and GND there is an open circuit). What will I read at the output ...
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Why does this ramp generator drop level outwith 60Hz / 10kHz range?

I found the following circuit in an old Elektor article: It is a [edit: ramp generator] that repeatedly (a) charges C3 through R4 to build a ramp, and (b) briefly shorts C3 across T1 to reset the ...
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Direction of current in Phasors Analysis

I'm learning AC circuit and phasors form. In the exercise below, when using nodal analysis they choose the direction of current flow in the circuit then calculate the result. But I wonder why that ...
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fast analytical technique identifying poles/zeros using degree of freedom

I encounter some engineers who can quickly spot poles and zeros in the circuit by identifying "degree of freedom". For example, a typical technical discussion goes like : "a miller ...
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Calculation of drain current in JFET

simulate this circuit – Schematic created using CircuitLab If IDSS= 10mA and Vp= -5V, when VDS=Vp, what is the value of ID and VGS? Lets say I apply KVL on drain-source loop. Then I get VDD-IDRD-...
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Can anyone check this circuit for a musical Tesla coil for me? [closed]

The attached circuit diagram is the one I will be using to make my musical Tesla coil for a project. The AC source on the right is the audio input through AUX, and the circuit will probably run around ...
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How can I stabilize unstable voltages over a silicon plate?

I've been working on an experiment where I investigate the hall effect over a circular silicon plate. Here is the schematic The two channels of the oscope are placed between the plate. Each of the ...
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Determine the functions of the given multiplexers

In the following problem I want to understand a section of the overall problem. The image only show 2 MUX(es), however the original question has a lot more that are ...
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582 views

Can two voltmeters connected to the same terminals show different values? Circuit with induced EMF

The circuit shown below consists of two resistors connected in series that form a closed loop. No electrical sources are in that loop.Let’s assume that the resistance of the wires that connect the ...
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3answers
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Calculate the active power

I'm asked to determine the active power (P). (I don't know if that is actually called active power in English?) The formula of P is = U * I * sin(alpha) How can we determine the alpha in this case, so ...

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