Circuit (Network) analysis is the process of finding the voltages across, and the currents through, every component in the network.

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Single-supply DC amplifier circuit with “gain” of 0.66?

I have a DC voltage source \$V_{in}\$ which slowly varies in the range 2.5…4.8V. I need to linearly scale it down by ⅔, to feed into a 3.3V ADC pin. For a voltage divider, the source has too high ...
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1answer
49 views

Voltage drop across a series with a source and a resistor

I've tried using KVL and KCL but nothing I do is resulting in an answer. I am struggling with how to treat the voltage drop and the two resistors that are in parallel with each other. I think I may be ...
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3answers
63 views

I can't figure out this circuit. How do I obtain the three currents?

I can't figure out why i2 is 0. I tried applying KVL on the mesh with the voltage source but I didn't get anywhere (perhaps I applied it incorrectly? i don't know if the current travelling through ...
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2answers
126 views

How do I use superposition to solve a circuit?

Yes, this is a pedagogical question. While answering another recent question, I wanted to refer the OP to concise instructions for using superposition to solve circuits. I found that all the easily ...
2
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2answers
76 views

Is there a simple circuit that outputs (min+max)/2 of a single-ended signal given as input?

I have a digital, single-ended, signal that randomly varies between +400mV (logical ‘1’) and 0V (logical ‘0’). I am looking for a circuit to calculate the DC value that corresponds to the average ...
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0answers
34 views

Node-Voltage assistance

I have to use node voltage to find the values of i1 - i6 simulate this circuit – Schematic created using CircuitLab Yes, I am aware that it would be a lot simpler to use mesh current ...
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3answers
75 views

How to level shift an analog signal?

I have a sinusoidal input signal (with a swing of 100mV roughly) centered around 100mV (DC). This signal needs to be input to a CMOS inverter. For this I need to level shift my signal around the ...
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2answers
56 views

Question about this RC circuit and voltage across the capacitor

I just have a small question about the below problem. How did they get Vc of the capacitor to be 12 V before the switch is opened? Doesn't the resistor use up some of the voltage?
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1answer
49 views

Need help finding the drain current of a jfet

I have this simple dc jfet circuit (homework): First of all I had to find the values of the drain and source resistors given the data above, this was pretty simple and I got: $$R_D=4k\Omega $$ ...
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1answer
44 views

Clipping circuit simulation producing unexpected result

I am playing around with a clipping circuit to protect a adc on my microcontroller. I beleive the following will work, but when I simulated the circuit I saw something funky. Any ideas on why adding ...
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1answer
153 views

Why does a Thévenin equivalent exist but not a Norton Equivalent, and vice versa?

In the following diagram, the Thévenin equivalent of the circuit on the left is shown on the right: simulate this circuit – Schematic created using CircuitLab However, it appears that ...
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1answer
45 views

KVL, KCL, nodal and mesh analysis

How do I write the KCL equation at node B using the node voltage at B, A and R1, R2, R3 and not in terms of ia ? By the way, label the node between R2 and R6 as node D.
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2answers
50 views

Voltage Doubler stops 'Doubling'?

I constructed a simple voltage doubler on a bread-board. Here's the schematic. simulate this circuit – Schematic created using CircuitLab The output across the 100kΩ resistor was the ...
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3answers
77 views

Basic Circuit Question

I need to confirm something.Do circuits like the one shown below in which there is no connection between points A and B,treated as separate loops with no connection between them?
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1answer
54 views

How to find the Q point of the NMOS trsistor in Voltage-Divider Biasing Circuit?

The following is the circuit needed to be analyzed to find the Q point(\$V_{GS_Q}, V_{DS_Q}, I_{D_Q}\$). \$V_{TN}=1\text{V}\$ \$K_n=0.5\text{mAV}^{-2}\$ simulate this circuit – Schematic ...
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2answers
53 views

How does a synchronous motor know to increase current when the mechanical load is increased?

Consider a very simple singe phase synchronous motor, such as the one shown in figure 1. This motor will not be self starting, but if an AC voltage is applied and the permanent magnet is given an ...
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0answers
37 views

When to use Delta-Wye Transformation?

I have these two circuits needed to be simplified. Now in Case 1, is R4 and R5 in parallel connection? In that case, how does the equivalent circuit look like when R4 and R5 is simplified? Or if ...
2
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1answer
55 views

How to convert Sequential circuit into a combinational circuit?

My question in general asks how to transform a sequential circuit/FSM into a combinational circuit. The reason why I'm asking is in SAT solving, we can use only combinational circuits. And so in ...
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1answer
33 views

Constant Voltage model pf Diode circuit analysis

I have solved this problem assuming an ideal diode model, but now I'm required to use the \$0.7\$V constant voltage model. If the same circuit in ideal model had both \$D_1\$, \$D_2\$ conducting, does ...
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0answers
44 views

Orthogonality detect circuit , is it possible or not?

Say,current due to E1,through R is I1. current due to E2,through R is I2. By superposition theorem : Current through R is (I1+I2). So, the power dissipated by R is [(I1+I2)^2]*R. If E1 ...
0
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1answer
32 views

Find voltage by using Laplace transform

Hi I've been trying to solve this problem on finding the voltage out by using the Laplace transform. I know it's pretty basic but I can't get the solution after trying many times. I'm starting now to ...
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0answers
21 views

Common drain CMOS single stage amplifier with current bias with positive and negative rail analysis

I was presented with a classical problem where i am asked to evaluate the output of this circuit when VIN = 0 and then 5 volts. The NMOS will be off as long as Vgs is less than Vtn. The NMOS will ...
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53 views

Mosfet small signal input resistance from source

Considering the T model of MOSFET for small signals I want to obtain the input resistance from source to gate. simulate this circuit – Schematic created using CircuitLab The current ...
7
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4answers
424 views

Can't figure out the general formula for electric circuit

I have the following setup. Note the device in the middle says P, not R, so I now how many Watts the device produces. (I'm not sure if I drew the correct symbol there) Calculating the current ...
2
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1answer
83 views

Is there another way to think of/draw this simple diagram?

I'm not too familiar with this "not-fully-connected" type of diagram, and so understanding it is giving me some trouble. How do I approach determining the following circuit's characteristics (i.e. ...
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0answers
26 views

Voltage and Currents in Complex Domain of RC circuits in MATLAB

Define the transfer functions by defining s = jω such that the circuit can be simulated in Matlab, that is, can display all voltages and currents for the circuit. Determine the transfer functions of ...
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1answer
40 views

Voltage source connected to a MOSFET source

This circuit simulate this circuit – Schematic created using CircuitLab where M1 is an n-channel MOSFET, is said to be incorrect. If the voltage Vin should be imposed to the source ...
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2answers
51 views

How to do Norton equivalent circuit? Why part of the circuit can be ignored?

I read the solution. It said that the 10mA and 10Kohm is not going to affect the circuit, so that it can be ignored. However, I don't understand why. Please help. If I really want to include those ...
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2answers
58 views

Algebraic Notation for Circuits

When dealing with a circuit diagram of some type, a fairly typical procedure for simplifying the circuit is to redraw the circuit diagram a number of times, each time performing one or more ...
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1answer
44 views

How to analyse the circuit performance of an electret microphone

I have a simple circuit that amplifies the output of an electret to drive a simple volume visualisation with an array of LEDs. I didn't design the circuit (though I did build it - works fine), but ...
2
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1answer
59 views

Calculating the gain and phase shift of a phase shifting circuit

I want to calculate the gain and the phase shift of the phase shifting circuit below. My approach is to derive equations to different meshes using Kirchoff's law, and then calculate the ratio between ...
0
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2answers
54 views

Triac circuit confusion

X1Iz.png I have the following questions about the above circuit: -Why are we even using a trica/diac combo above. Why would a circuit consisting of just the fuse, switch and primary not be ...
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3answers
131 views

Why does the Mesh Currents Method work?

When there is an n-mesh circuit, we define n independent mesh equations for the unknown n currents. While doing this, we use an assumption that each mesh has a separate current flowing around it. I ...
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1answer
144 views

Learning the Basics of Circuit Design [closed]

This question was put on hold, citing the fact that any answer would be based on opinion. I can't really argue that point, but I do believe that in this case the point is irrelevant. I am asking for ...
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1answer
65 views

How to figure out polarity of a polarized capacitor in a circuit

I've found myself a number of time trying to build a circuit from a schematics that does not provide any polarity indication for caps (probably because the designer used non-polarized caps in the ...
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2answers
69 views

Differences between current sources transistor and current mirror

In this configuration simulate this circuit – Schematic created using CircuitLab if the two pMOS are equal, they provide the same drain current to both the branches: suppose that Vbias ...
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2answers
227 views

STM32 Understanding GPIO Settings

In STM32 Standard Peripheral library, we need to configure the GPIO. But there are 3 functions which I not sure how to configure them; GPIO_InitStructure.GPIO_Speed GPIO_InitStructure.GPIO_OType ...
0
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1answer
48 views

analysis of RC circuit using Matlab

I designed the circuit and obtained the desired outputs correctly. for for circuit it R = 1e3 , C= 0.15e-6, and f = 250 , ( for RC circuit) and in the second part it asks to increase the frequency to ...
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0answers
29 views

Help solving a 2nd order RC with 3 inputs

I posted a couple of questions lately, all related to the same problem. Whether I had a suitable answer to the particular question asked or not, I tried everything I could think of* without any ...
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1answer
45 views

Nonzero initial conditions for a circuit solved using superposition theorem?

Suppose I have a linear circuit with 3 voltage sources Vin1, Vin2, and Vin3 in it, and one voltage of interest Vout. It's common practice to solve it using the superposition theorem, so this will lead ...
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1answer
38 views
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1answer
74 views

static Hazard and challenging questions

i read some notes that wrote: for following Function F, has static Hazard, if B=C=D=1, and for each change in value of A, the Static Hazard 1 can be. Why this statement is True?
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62 views

how to redesign the circuit to drive a 230V 100W lamp for 5 minutes

I have a circuit , the circuit operates with a siren using a 9v battery the siren used is UM3561 i want to replace the alarm part of the circuit using a RELAy that can drive a 100W 230V lamp for 5 ...
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3answers
143 views

Why can't you divide a series + parallel circuit into branches to get total current?

Suppose we have a circuit like this where \$R_1 = R_2 = R_3 = 1\$ simulate this circuit – Schematic created using CircuitLab Why can we not divide this into two branches, \$ B_1, B_2 \$ ...
4
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2answers
400 views

Power Dissipation Issues

I built a circuit with a 5V power supply and a 300-ohm resistor. With a multimeter I did the measurements of resistance, voltage, and current across the resistor. The values were: \$R = 298 ...
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1answer
77 views

Finding the voltage of a capacitor

I was given this problem by my prof and his answer is simply that it is a parallel RLC circuit and he uses $$s^2 +\frac{1}{RC}s+\frac{1}{LC} = 0$$ for the characteristic equation. It seems to me ...
4
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3answers
245 views

Calculate op-amp output voltage

I am trying to calculate the output voltage of the circuit. I know that this is a voltage follower, but I am trying to understand how it works. simulate this circuit – Schematic created ...
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1answer
46 views

RC integrator behavior

I am trying to implement an RC integrator circuit in my design. The purpose of this circuit is to convert input pulse signals swinging between 0 to 2.5V into a ramp signal. The integrator circuit was ...
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4answers
93 views

Input and output resistance of an opamp circuit

Recently we have been working with opamps in the lab and I never can understand how to determin the output and input impedance of a circuit with op-amps (not the input and output inpedance of the ...
17
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2answers
1k views

Half-wave diode rectifier - is textbook wrong?

I've noticed that in all resources on diodes and rectifiers, they show the output voltage as the positive half-wave of the input signal. However, that seems wrong. I understand that there's a voltage ...