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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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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 ...
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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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Do not match upcoming states in Logisim project

Do not match upcoming states in Logisim. Any idea how can I solve this? This is the table of transitions: I do not know why the future states are always equal to the present states.
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Power supply switching circuit design

I am trying to design the power supply needs for my project. It has 2 loads in parallel, one 12V and one 5V. I want to power it from as 12V Wall Adapter that will drive my 2 loads and charge the ...
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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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39 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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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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Can anyone please tell me the exact purpose of 3 resistors connected with MCS2 contact?

Can anyone please let me know the extract purpose of the three resistors connected in series with MCS2 contact? Any help would be appreciated.
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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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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
61 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, ...
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I want this problem solution [on hold]

please i want the solution of this problem i tried to solve it but no answer. Calculate the maximum achievable bridge deflection voltage for an applied torque T
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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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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
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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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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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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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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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DC-AC circuits exercises

I have some problems with electronics and I can't solve the two exercises below: the first one: and the second one: In the second exercise I managed to calculate (hopefully it is correct) that DC ...
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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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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
33 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
41 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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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
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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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Issues with calculating the minimum value of the Load Resistance (RL) in this scenario

I am currently in Year 12. I am facing issues with calculating the minimum value of RL before regulation stops in the following circuit: Below are the questions associated with this scenario: ...
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1answer
49 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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69 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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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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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
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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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What can cause an RLC circuit to fail? [closed]

What are some conditions that can cause an RLC circuit to fail and what are the safety considerations when making an RLC circuit?
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1answer
50 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
53 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
104 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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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
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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 ...
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Why is [Z] = 1/[Y] but Z11 =/= 1/Y11? [closed]

In 2 port networks, we can directly transform whole Z matrice into matrice for Y parameters by computing its inverse but When we talk about individual elements, like Z11, why isnt it equal to 1/Y11 ? ...
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How do you solve this circuit with the node voltage method?

This question requires you to find the node voltage between nodes 1 & 2 as well as condense the circuit into its Thevenin Equivalent with R2 as the load. The correct answers are 4 V between nodes ...
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1answer
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Op-amp problem, two inverting amplifiers?

So I stumbled across a rather strange ideal op-amp circuit that I've never encountered before. I've done enough problems regarding inverting amplifiers, non-inverting, summing, difference, and such, ...
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1answer
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How to find voltage across resistors in RC Circuit with 2 voltage sources?

I've been struggling with this difficult RC circuit that asks for the voltage, Vo, across the R4 resistor. Edit: Assume that the switch has been opened for a long time, before it is closed at time t ...
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How can I make a magnetic field using a series RLC circuit?

So in my circuits class my assignment is to make a magnetic field that lasts for 1.4 microseconds and within that time the pulse must rise for at least 1 microsecond. We haven't covered magnetic ...
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1answer
75 views

How to decide on the values of a set of resistors for a circuit?

Say i have a PN2222 transistor that i want to integrate into a circuit to amplify a signal with a gain of 100 or so. From the datasheet of the transistor i can determine that ...
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1answer
114 views

Finding total energy for RC discharged capacitor at t = ∞?

Most Rc circuits are not as severely difficult as this kind of circuit. I'm trying to solve for both the time constant and the voltage V2 across the R2 resistor, both of which will hold the necessary ...
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RL Circuit Analysis with 2 sources, how to find current of resistor?

I've been tackling some problems related to natural and step responses for RL & RC circuits, but I think I've hit a major roadblock for this RL circuit. I'm trying to find the time constant and ...
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Can a dependent voltage/current source have some impedence/admittance,respectively?

Im studying 2-port networks, for Z parameters equations, there is general equivalent circuit given, in which dependent voltage source is given, I do know about dependent voltage sources, but do these ...
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Derivation of \$Z_{och}\$ & \$ Z_{sch} \$ for a symmetrical lattice two port network

I've been trying to proof the open circuit impedance of half circuit [i.e \$Z_{och}\$ ] and short circuit impedance of half circuit [i.e \$Z_{sch}\$ ] of symmetric lattice two port network (which is ...
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1answer
61 views

Power absorbed by load resistor

Can someone double-check where's the mistake? The system didn't accept my answer. TASK: Find the maximum power absorbed by the load resistor, knowing that: $$E = 6.6V; R_{1} = 12.1Ω; R_{2} = 14Ω; R_{...
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Negative mutual inductance in magnetic circuit

I have a magnetic circuit that I got to an equivalent electrical circuit given in picture below. From my lecture, mutual magnetic permeance \$\Lambda_{jp}\$ is the result of magnetic flux \$\phi_{jp}\...
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Current pulsing circuit, troubleshooting

I was not sure what to title this question. What I have two version of the following circuit, that I have built and modelled. The application is to create a pulsed magnetic field, by pulsing a ...