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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.

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Why the led isn't glowing? [closed]

Why doesn't the led glow? I am trying to glow my LED For Making Project Of Detectore but it doesn't glow. When i connect this circuit with my full project that time LED Wasn't Glowing After I ...
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1answer
44 views

How can I use the component CD4538 or a 555 timer on Multisim?

How can I use the component CD4538 or a 555 timer on Multisim for a delay of 1 second ? I want both of the nor gates to be 1 for roughly 1 second when the output of the op-amps is either 01 or 10.
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0answers
281 views

How is it that two electric currents can travel in opposite directions on the same wire, at the same time, without interfering with each other? [duplicate]

An Introduction to Information Theory: Symbols, Signals and Noise, by John R. Pierce, says the following: While linearity is a truly astonishing property of nature, it is by no means a rare one. ...
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1answer
76 views

5 to 12 V boost converter not boosting

For my power electronics course, I need to design a basic boost converter that is converting 5 V to 12 V with 0.5 A output current. Below you can see the simulation results. MOSFET is driven by 20 kHz ...
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2answers
87 views

How would I finish out this mini project (emitting 1 whenever 101 is read)?

Design a Moore finite state machine that detects 1 0 1 in consecutive digits in the input stream of 0's and 1's received every clock cycle. The circuit should output a 1 when it detects 1 0 1 ...
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1answer
52 views

Average power dissipated as the heat in the resistor

I’m trying to calculate the average power dissipated as the heat in the resistor. A 12 V amplitude sinusoidal signal is applied across a 500 ohm resistor. I have determined the current amplitude to ...
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1answer
57 views

ExplainIng how isolated rs232 interface works

I trying to drive the rs232 interface, so I can send and receive data to the device am controlling. I want to know why you need the two transistors on its comms line. Why not just one?
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2answers
93 views

Why I got a minus output value?

When I simulate the circuit on (OrCad) I got an output voltage between (0 to 1) V changing with temperature . but when I connect the circuit I got the output voltage = -1.85 in minus and different ...
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2answers
71 views

PIC simple LED ON not working

I have been trying really hard to just get a PIC to turn on an LED, i know its super simple but for some reason i just cant figure out, its not turning ON! I am using an old fashion PIC16F877, I am ...
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1answer
82 views

Measuring the effect of a resistor

In an idealized model, the voltage at node1 is the same as the voltage at node2. However, in reality waves take time to travel and the voltage at node1 will not be identical to the voltage at node2. I ...
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2answers
37 views

How can I have different circuits relays based on a particular voltage input?

I want to build a circuit that is dependent on an input from a thermistor which is in a circuit that is a voltage divider. Now if the thermistor is showing low temperature, then I want to increase my ...
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1answer
27 views

Measuring a magnetic pulse using a coil, and circuit adjustments

I have the following circuit, I am using it to create a pulsed magnetic field, in the coil. I am trying to measure and verify the magnetic field in the coil. I am testing it with 40 V to drive the ...
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0answers
40 views

What is the difference between voltage across battery and voltage across a resistor?

simulate this circuit – Schematic created using CircuitLab I am doing an experiment for a lab and I am confused as to what they are asking. They ask to measure the voltage across the battery, ...
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1answer
32 views

RC Integrator mean value

i am trying to understand the behaviour of an RC integrator for \$f>>1/RC\$, i.e. in the integration domain. I know that at the capacitor i have \$V = \int V_{in}/RC dt\$; experimentally i find ...
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0answers
74 views

Second Order Circuit, Sadiku's Fundamentals of Electric Circuits

I would like some help with Sadiku's exercise about second order circuits. I did'nt understand why the solution says that V (0) = -30 V. Also, I did not understand why the capacitor's voltage (Vc) ...
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1answer
67 views

How is calculated the average current?

I was given a problem, the conditions are: The voltage and current for a device (using the passive sign convention) are periodic functions with \$T=100 ms\$ described by \$v(t)=\begin{cases} ...
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1answer
67 views

Latching power switch circuit

I am trying to understand: 1) how the following circuit works and more specifically how it turns on. 2) How to to modify it to get a hold on/hold off behavior instead of push on/hold off to prevent ...
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2answers
83 views

How to simulate the exponential growth op-amp?

According to Wikipedia, the following is the exponential output operational amplifier. I would like to test this out in a simulated environment and see how this functions. For example give a sine ...
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3answers
2k views

Resistors in parallel but with a capacitor in between them?

If I have a source between two resistors in series, can I just add the resistors and place the source below,under them? If I have some element in parallel like a capacitor, between two resistors in ...
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0answers
59 views

Series BJT transistors with bases connected through a resistor

For an assignment I was given a problem which consists of two BJT transistors, a PNP and an NPN, in series with their bases tied together. simulate this circuit – Schematic created using ...
2
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2answers
105 views

What's wrong with my1943/5200 Mosfet Amplifier? Blown on first run

I have just brought an 1943/5200 mosfet based amplifier board. Shopkeeper said it's rated for 24-0-24 AC. So I connected it with 24-0-24 transformer like this in image below. As soon as I turned the ...
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0answers
59 views

How to Find Resistor for Maximum Power Transfer?

I honestly have no idea what is the best way to find RL for maximum power transfer in this circuit. What I do know, first and foremost, is that the RL resistor can be found as the Thevenin-...
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2answers
52 views

Correct Voltage Detection

I have ran into a problem where some USB supplies drop below 4.6 volts. Is there a circuit that would block the voltage below 4.7 volts and pass the voltage when it is above 4.7 volts. I have tried ...
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0answers
52 views

Finding Current in Parallel RLC Circuit with 2 voltage sources?

I've spent sometime learning about step responses for series/parallel RLC circuits, but this problem takes things a step further, since C seems to be in parallel with a series combination of RL and a ...
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1answer
83 views

Can anyone please tell me the exact purpose of 3 resistors connected with MCS2 contact?

Can anyone please let me know the exact purpose of the three resistors connected in series with MCS2 contact? Any help would be appreciated.
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1answer
46 views

Relay Circuit Explanation

I am trying to understand relay circuits better. I have two circuits in question below. Left Image I understand Pins 2 and 9 are the coil contacts. I would wire a microcontroller outpin pin to a ...
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1answer
31 views

Average Power of load conected to an Ideal Transformer

Where does the 1/2 come from in the power equation?
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1answer
70 views

D Flip Flop Toggle — Q into Hex Inverter into D, Unstable Output, Help

simulate this circuit – Schematic created using CircuitLab I created the above circuit. There is essentially a switch that is normally high. I press a button. Using a NTE4049T hex inverter, ...
0
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2answers
101 views

Is there current flowing through this capacitor?

Let's say \$ V_s \$ is some time-varying voltage source. Is it necessarily true that the current going through \$ C_1 \$ is zero? I would think that the answer is yes, because the current flowing ...
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0answers
24 views

Q: Unexpected behavior from digital Rheostat

I have no idea whats warranting this behavior from the MCP4162 device Starting from 500mV(pp) - 2.8V(pp) a weird "wave" like distortion happens in between the two voltages. (Towards the negative ...
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1answer
58 views

Envelope detector circuits explanation [duplicate]

Why do these 2 circuits produce differen output signals (something has to do with charging/discharging capacitor)? Please explain in detail and how does the envelope detector work based on this
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1answer
77 views

Envelope detector circuits

Why do these circuits have different output signals, please explain in detail. And how does the envelope detector work?
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1answer
57 views

Can a ground fault be caused by something outside the home?

Yesterday afternoon, I had a GFCI switch trip. It would not reset. I figured I had a ground fault. I left the home for a few hours and after I returned I was able to successfully reset the GFCI. The ...
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1answer
37 views

Overdrive Voltage Effect on Cascode Operation

Working on this exercise: I understand that if all the transistors in a cascode have the same current and the same Vgs then they will have the same Vov. However in this case the Vgs do not seem to be ...
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0answers
47 views

Differential Amplifier Exam Problem

I am lost with how to approach part C and D of the question. In fact, I need some intuition with how to tune a differential amplifier.
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2answers
92 views

Can I get help on the circuit diagram?

So I recently ordered and received the Adafruit heating pad (10 × 5 cm2). And I'm looking over the website to see if I can find a circuit diagram for how to use it since I don't have other ...
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1answer
41 views

Xr2206 sine wave oscillator

If xr2206 is used to generate a sine wave does it have dc component? Based on my analysis it does not have.
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1answer
43 views

Sine wave oscillator

What circuit or ic can I use to produce sine wave with 30 kHz frequency and 9 Vp-p? I used XR2206 but the maximum peak-to-peak voltage is 3 V and I need 9 Vp-p. I will be using this for inductive ...
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0answers
13 views

Dividing the rotor circuit by slip in induction motor

In this article equation (3), just after figure 5, they divided everything in the equation for current by slip. I understand that current remains the same when doing this, but voltage and power would ...
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2answers
66 views

Help with reading a blurry circuit diagram

I read the paper "Digital sound processing using Arduino and MATLAB" and there is a circuit there, you can see it in this photo: Can anyone please help me read it properly? Is the 2 resistors ...
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1answer
51 views

How do I calculate total resistance?

As far as I understand, two resistors are connected in parallel if the node at both ends of both resistors are the same. And in series if only one node is the same. But what if between two resistors ...
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3answers
76 views

Need help understanding RC discharging through a transistor in a timer

Once I push and release a pushbutton I want a LED to light for say 10 seconds. I found a design for this on the web and tried it out: What I observed on the breadboard was that the LED lighted for at ...
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0answers
51 views

Determining the output resistance of a BJT amplifier

I'm given the following amplifier: (all the transistors have the same characteristics; Early effect is neglected) In order to calculate \$R_{out}\$, we replace the circuit with its small-signal ...
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2answers
47 views

Passive Elements At high Frequency [parasitic effects]

What would the magnitude Response curve for a Resistor, Inductor and Capacitor look like [with parasitic effects not ideal components] ? From what I have gathered they would look something along the ...
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2answers
81 views

How do I model a digital out in a circuit simulation?

I have a PIR: Panasonic NaPiOn AMN34112 that has a digital output. When it detects motion it outputs 4V and 100 uA max. I want to connect this output to a LED using one or more transistor amplifier ...
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1answer
54 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 ...
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1answer
59 views

How to solve this circuit using KCL

I understand the super node aspect of this circuit, but I'm unsure of what to do as I dont see a direct way to proceed with KCL using all of the nodes. I found the equation for the supernode, but I'm ...
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4answers
108 views

Opamp with multiple feedback loops

I have been trying to figure out how the following circuit works and what it might be good for without any luck so far. What might the transfer function be? Is there a way that analysis can be ...
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2answers
51 views

LTSpice capacitor network simulation question

Below is a circuit build in LTSpice. It is capacitor network simulation. What is of interest to me is the voltage at node N005. A voltage controlled switch rises the voltage of node N003 to 29.42 ...
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1answer
68 views

Transistor Video Amp Circuit Help

I built the below video amp & it worked nicely.But it is One in One out video amp. http://www.learningelectronics.net/circuits/video-amplifier.html Now I want One in TWO out Video distributor.I ...