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

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help related to frequency of schmitt oscillator

I have seen the CMOS Schmitt waveform generator circuit (i.e. figure 2nd) from the following link http://www.electronics-tutorials.ws/waveforms/generators.html I tried to simulate the circuit in ...
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2answers
51 views

Help fixing Honeywell doorbell broken circuit [on hold]

My Honeywell RCWL330A1000/N P4-Premium Portable Wireless Door Chime dropped to the floor the other day and has not worked since then. I unscrewed the casing an found a crack in the circuit board which ...
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1answer
28 views

Finding 2nd Vds value in a NMOS circuit

I think for the first part of this problem I solved for Ra = 13kohm and Rb = 7kohm, but I'm not able to understand or see how to get the voltage at the point V1. Any idea on how to go about finding ...
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1answer
49 views

Determine the currents in the following circuit

Here I have such a problem. I'm asked to determine the values of currents in this circuit(the circuit is in permanent sinusoidal regim). The double-sided arrow in the image represents the magnetic ...
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2answers
69 views

Does a constant current source add to existing current?

If I have a circuit where one branch contains a constant current source (e.g. 2A), does the current leading out of the current source equal the current leading into it (e.g. 4A) plus the current of ...
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39 views

Gain in common source amplifier

Let us consider the Common Source amplifier depicted below: We know that the gain \$A_v\$ of a such circuit is given by \$A_v=-g_mR_D\$, where \$g_m\$ is the transconductance of the MOSFET. We also ...
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130 views

BJT Circuit Base-Emmitter voltage

I don't understand, why the voltage V2 is approximately Vb. Can't V2 be 0, if Vb is enough high, so that the emmiter-current of Q2 is Ie2? The assistent only told me, that because both transistors ...
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94 views

Peltier circuit design for TEC

I'm designing a TEC circuit with a Peltier element, LM35 as the sensor and Arduino uno as the controller. I simulated it with Proteus and to my knowledge it was working, I suppose. But when I tried to ...
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4answers
50 views

Why does this circuit give different values for different methods

Is there a rule that I am missing? I need to find the resistance of this circuit: I seem to get different values depending on which way I take the resistors. Is there any rule I am missing when ...
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37 views

Active power of a circuit

In the below circuit \$Z_C=(10-j50)\Omega\$, \$|I|=2\$A. I have to calculate the active and reactive power in \$Z_C\$ simulate this circuit – Schematic created using CircuitLab ...
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2answers
55 views

When using nodal analysis of a circuit involving CCCS, how do you know which currents are entering and which are leaving?

I am trying to solve the following circuit: I believe the answer I'm getting for \$i_b\$ is wrong because I put it into LTSpice and I'm getting that \$i_b = -3.63636\$ This is my LTSpice diagram: ...
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26 views

Calculation of a current at règime

I have to calculate \$i(t)\$ at règime, by knowing that \$v_s(t)=2\cos(\omega t + \pi/2)\$, \$R=1\Omega\$, and that, at the generator frequency, \$X_c=-1\Omega\$ and \$X_L=1\Omega\$. simulate ...
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69 views

Why the voltage of supply got stuck when connected with leds?

I was working with some smd LED's trying to make their V-I curve. For that purpose, I connected two segments parallel to each other each containing two leds as shown, to a regulated dc power supply ...
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15 views

Redistribution of Flux Linkage in a Loop

This is a problem of Linear Circuit Analysis. We have to find the current through the inductors in t=0+. We can note that surely a impulsive current has to happen due to KLC on the left. How can we ...
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67 views

Analog Circuit Design

I posted this yesterday and it was deleted so first of all, let me apologize if i gave the impression that i was trying to get you guys to do my homework for me. i most certainly wasn't (sorry I'm ...
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1answer
40 views

Calculation of a voltage in the frequency domain

The current generator provides a constant current \$I\$ and the circuit is at règime conditions. At \$t=0\$, the switch T is being closed. I have to calculate the voltage \$v_c(t)\$ by using the ...
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2answers
83 views

Prove the formula RMS = 2.22*average of for a half-wave rectified sinusoid with a zero average value?

I was wondering if anyone can clarify exactly how I am supposed to prove the formula above. If I try to verify my work as I have gotten, then I would have sqrt(2)/2 = 2/pi*2.22 which is not the case; ...
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3answers
48 views

circuit in neither series or parallel (is wye delta transformation necessary?)

I have been trying out this one problem and I just want to know if I am on the right track, because it feels like a large amount of work based on such a simple circuit and it is getting quite messy. I ...
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41 views

Capacitor at règime - Circuit analysis

In the below circuit I have to calculate \$v_u\$, as \$t\ge0\$. The given data is: \$E=4\$ mV, \$R_g=10 k\Omega\$, \$R=100k\Omega\$, \$C=1\mu F\$ simulate this circuit – Schematic ...
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30 views

How to find base current and collector current in this circuit? [duplicate]

Suppose the transistor in the diagram above has a \$\beta\$ of 100. How can I figure out the base current in the circuit and the collector current? Furthermore how can I evaluate \$V_B\$ and ...
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63 views

Passive Convention Specifics With Regards to Resistors (Problem linked)

I was wondering how exactly passive convention works with respect to unlabeled resistors. In the problem attached, I realized you only get the answer if you label the resistor terminals one way, ...
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4answers
102 views

BJT Biasing with negative voltage

I got this question as a school assignment (1st year electrical engineering). I have to calculate the 3 unknown resistor values. The values which were given are in the schematic. Further \$\beta = ...
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21 views

Power at sinusoidal regime

I have some doubts about the solution of this exercise. I'd be really grateful if somebody will help me to leave them. simulate this circuit – Schematic created using CircuitLab The ...
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2answers
46 views

Peer Review of Buck Converter

The only limitations I can think of are: Comparator/Schmitt not gate output swing time, and Transistor switching time simulate this circuit – Schematic created using CircuitLab BTW, ...
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1answer
39 views

Small signal analysis of MOSFET. Calculating Gain

I can do DC analysis and draw the small signal equivalent circuit just fine. I generally have trouble calculating gain. I'm having trouble understanding the answer to this question. This is the ...
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1answer
30 views

thevenin dependent source finding Rth

The answer is 16, but can anyone please explain how? note m is u I confused because, I dont know how to solve for Vx ? I know that once I find Vth and then resolve the circuit closed and finding ...
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3answers
45 views

Calculation of a voltage in a single mesh circuit

simulate this circuit – Schematic created using CircuitLab Why is \$v_{R_2}=(v_1-v_2)\frac{R_2}{R_1+R_2}\$ ? Could anybody show me this formula, please? \$(v_1-v_2)\$ is the voltage ...
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13 views

Simulate two-port networks in spice

I've been trying to simulate a circuit that includes a two-port network. While I was able to solve my problem using the T-model, I'm curious, how could I simulate a non reciprocal two-port network? I ...
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1answer
39 views

Relation of current with frequency and voltage

I tried to solve a numerical problem but I got stuck and I think it very necessary to have its solution. I will draw certain basic conclusions when I would found its solution. The question is: An ...
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1answer
49 views

Derivation of current gain and voltage gain for common base BJT

For a common base configuration BJT such as the one shown here: How can I derive the voltage gain and current gain?
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1answer
32 views

analog circuit nodal analysis

I had difficulty in evaluating following circuit's node analysis to find the transfer function. I had difficulty because of the ground in the middle of the circuit and the way the source voltage is ...
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1answer
15 views

initial state in s domain

in question below I couldn't' evaluate the initial state for inductors and capacitor in order to do the s domain analysis. If you can also show me how can I draw the circuit for inital state, I would ...
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38 views

How do I create GPIO outputs from circuit to connect to Arduino Micro

how do i design the GPIO outputs so i can connect it to two pins on my Arduino and get the readings. ie. if green didoe is on GPIO 1 = High, other wise Low if red diode is on GPIO 2 = High, ...
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77 views

Working out current, voltage and resistance in a Bridge circuit?

This community is so helpful, my thanks go out to any comment I got with helpful advice. Here's another homework problem. I've tried working most of it out, but I have a feeling that I'll have to ...
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36 views

AC and DC circuit analysis question

simulate this circuit – Schematic created using CircuitLab Can somebody help with doing the DC and AC analysis of this circuit to find RE and R2 such that Ai(Current gain) = 32. I have no ...
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162 views

How would you solve this resistive network?

simulate this circuit – Schematic created using CircuitLab I'm not really sure how to solve this. I can't see any series or parallel connections. I need to find the Total resistance, V1 ...
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79 views

How would I monitor I/O on multiple circuits at the same time? [closed]

I've got a device that communicates over a 8 wire cable. I'd like to examine the signals going into and out of the device without having to test each line individually with my multimeter. Is there a ...
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2answers
49 views

Energy absorbed by the condenser

If the current \$i=0\$ the total energy absorbed is: \$E_{tot}=E_C+E_L\$, where \$E_C\$ is the energy absorbed by the condenser and \$E_L\$ that absorbed by the inductor. Now: \$E_C=\frac{1}{2}C ...
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Calculation of a current in the Laplace domain

In the circuit below (working in the Laplace domain), I have to calculate \$I\$. $$\begin{align} &I=\frac{-V_L-V_C}{sL+\frac{1}{SC}}=\frac{-V_L - \frac{V_0}{s} - I \frac{1}{sC} ...
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121 views

How to design blinking LEDs circuit using analog elements only?

I want to design a circuit to blinking three LED in a row with 2 second delay for shifting/changing using analog elements only (using Resistors, Capacitors and Transistors and without Micro ...
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1answer
46 views

Replacing a piezoelectric speaker with an electromagnetic one

I'm making this circuit: where X1 is a piezoelectric speaker or ear piece. However, the only kinds of speakers I can get in time to finish this project are electromagnetic ones (we found one in a ...
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1answer
35 views

Superposition on a circuit with just one source

I'm trying to analyse this circuit (state variable filter): All the places on the web I've found solve it first using superposition, creating an equation of the form \$ V_2 = kV_1 + kV_4 + kV_3 \$. ...
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27 views

Parallel networks and references

I have a very simple question regarding parallel RLC networks (or any similar circuit). When given a problem where the reference voltages and current directions are allocated 'strangely', is my ...
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19 views

Circuit to integrate BeagleBone Black with Pressure Regulator

I am using BeagleBone Black as controller to control a proportional pressure regulator (Festo VPPM-6L-L-1-G18-0L10H-V1P-S1) which is the actuator of my project. The pressure regulator has an input ...
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3answers
53 views

What is the Voltage output of this Unity gain amplifier?

This Unity gain op amp has a ac supply in line with the resistor to the positive terminal of the op amp. What is the formula to obtain the output voltage? My challenge is the additional resistor ...
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23 views

S domain analysis initial state

Hello, I have a question about s domain analysis. I couldn't handle the initial state part since there is both dc source and an ac one. If I could do the initial I will be able to solve the rest by ...
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1answer
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Voltage calculation with the nodal analysis

I'm having problems with the calulation of \$v\$ in this circuit. simulate this circuit – Schematic created using CircuitLab With the nodal analysis (K.C.L. at the node 1) I got: ...
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37 views

RC first-grade circuit with op. amplifier

I tried to calculate the voltage \$v_u\$ in this RC circuit, but I got stuck when it comes to calculate \$v_u(\infty)\$ and \$\tau\$. simulate this circuit – Schematic created using ...
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33 views

RC/RL first-grade circuit

GIven the following circuit I have to calculate \$v_c(t)\$ and \$i_L(t)\$ simulate this circuit – Schematic created using CircuitLab Their expressions are: ...
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2answers
121 views

LM324 Pre-Amp For Mic (to PC) Not Working

I don't have much experience in circuit assembling or designing but I wanted to create a pre-amp for my microphone(Philips SBC MD110 Dynamic Microphone which I directly connect to my PC) to boost the ...