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

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Current Source Transformation

So my question is: Can I transform the current source I1 with R5 into a voltage source? I know for sure that if R3 was not in between them I could, but does it make a difference? I am not sure. ...
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3answers
42 views

Double CD4017 leds driver 555 clock

The very cool circuit is from here: http://engmousaalkaabi.blogspot.com/2016/01/81-led-chaser-using-double-ic-4017.html Here are my few questions regarding it. 1, It has 18 transistors. are they ...
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1answer
115 views

Why is this diode here?

I am building a VU meter. Searching in the Internet and coming up with some things on my own, I ended up with the following circuit First, there is an amplifier whose role is to give the VU meter ...
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0answers
51 views

Help with this circuit problem [on hold]

Please help with this circuit problem. The answer is supposed to be 1.5v but i do not know how to get to that answer. I basically tried to use the formula E.M.F = V +Ir but it still doesnt give the ...
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2answers
36 views

Sensor Tranfer Function

I've this transfermodel, my controller is a PID-controller and my sensor is this, how can I find the Tranfer Function of the sensor?:
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0answers
25 views

How can I apply superposition theorem to this circuit?

I can not figure out, how can I apply this theorem in order to find the various powers in the circuit presented above. I would appreciate any help. It is given that: I = 6A, V=2V, R1 = 4 Ohm, R2 = 3 ...
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4answers
1k views

Hacking Circuits Together Using Existing Schematics

I am working on a prototype using existing breakout boards from open source hardware manufacturers (Sparkfun, Adafruit, Teensy etc...). Everything is going great! I am at the stage where I'd like to ...
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1answer
33 views

Does a thicker wire mean more charge carriers in I = n A q V?

If you have two wires A & B made of same material with A being twice as thick as B, when using the formula I = n A q V will the value of n and Q remain the same for both wires or will they change? ...
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1answer
47 views

How to analyze this diode circuit for a resistance?

I'm sorry for posting a textbook question, but it does not provide any explanation and I am pulling hair trying to make sense of this. I tried converting each of the diodes to a 0.7V DC source with ...
2
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2answers
47 views

Controlling Two Circuits with One Switch

I'm trying to build a circuit with multiple timers, each with an SPST output relay. I want to connect up my circuit so that if any of the timers reaches their set point, they turn on a beacon. It ...
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2answers
80 views

Where do these 200 mV come from?

I was analyzing a circuit and when simulating it in PSpice I came across this: Is there a way of calculating without simulation (i.e. just looking at the circuit and doing the algebra) that ...
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1answer
63 views

How to calculate Vout from the MOSFET circuit

This circuit diagram is given in my book : simulate this circuit – Schematic created using CircuitLab and said that from the above figure , they calculate \$ \frac{V_{out}}{V_p} \$ ...
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1answer
61 views

Charging and discharging of capacitors

I simulated this circuit in TINA-TI. However I could not understand the output waveform for the negative half of the cycle. Waveform: Green- Voltage across C2 (10 u cap) Brown- Voltage across C1 (1 ...
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1answer
55 views

Output voltage function (circuit-analysis)

What will the function of the output voltage be? My work, and am I right?: ...
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1answer
179 views

How do these capacitors in this BJT Darkness Detection circuit work?

This circuit detects darkness and produces a beep alarm. I simulated the circuit in LTspice and verified it works, but I still don't understand how the capacitor (4.7uf & 100nf) function in the ...
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0answers
70 views

Why is this circuit working and giving 3.3V at the output?

I have been trying to see how I have 3.3V in output of this circuit but I can't find how I get this value in output:
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1answer
135 views

Finding the equivalent Resistance of acircuit

simulate this circuit – Schematic created using CircuitLab I am a little confused on how to find R equivalent of this circuit because of the wire. Right now I have the following ...
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2answers
57 views

How to approach diode circuit analysis (novice)

In my microelectronics course we have just begun learning about diodes and semiconductor physics. We have been analyzing simple circuits with diodes, mostly solving for component values. The approach ...
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2answers
73 views

RC circuit with two capacitors

Figure out the Vout wave form of the following circuit: ( assume the name of the 9u capacitor to be C2 and not C1) Is there any way to intuitively plot the waveform by understanding the behavior of ...
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1answer
37 views

how to get delays of a circuit under process corner in hspice?

my circuit is composed of a chain of inverter (delay line), and i want to see how the delay of this chain of inverter behave in process corner? i want to know if the delay line will be still ...
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1answer
38 views

kirchhoff with current source

When using kirchhoff with a loop with resistors and current source, how should I use kirchhoff voltage law? for example in this circuit: simulate this circuit – Schematic created using ...
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1answer
47 views

How do I work out energy stored in a capacitor bank?

I would like to know how to work out energy stored in a capacitor bank ? I have done my own working outs and have reached an answer of 0.192J, I don't know if this is correct ?
4
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2answers
186 views

Strange op-amp circuit FM radio

I am working on a simple FM radio receiver. Built the circuit and it works very well. Learned few new things, and got some questions, especially the output stage. The Op-amp 2822 is a dual op-amp, ...
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0answers
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process variability simulation in hspice

in order to analyze the impact of the process variablity on my circuit, i want to simulate a delay line and logic cloud (different gates ) under process corner in hspice. first i should to consider ...
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2answers
75 views

Can this part of the slayer exciter circuit be disconnected?

Basic Slayer Exciter The rest of the circuit makes sense, however I am wondering if this wire can be disconnected from the circuit. If a charge is being accumulated at the "275", where it will ...
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0answers
42 views

Thevenin theorem

I need to find the current through the resistor \$R\$. To find \$R_{th}\$ I cut the resistor \$R\$ and short the voltage source and get simulate this circuit – Schematic created using ...
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1answer
27 views

Difference between the natural response and transient response of an RLC circuit

Some books talk about the natural response of the RLC circuit. This is when the voltage source is taken out from the circuit. Some other books talk about the transient response of an RLC circuit, ...
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1answer
36 views

Nodal Analysis Question

I however do not see any wrong with my approach. But I am not getting the correct answer. Is there anything to do with grounding? Or am I missing something else?
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3answers
36 views

Where do I find models for various common op amps for use in LTSpice

I have just started using LTSpice. I need to simulate a circuit with op amps, where the parasitic elements of the op amp may effect performance. So I need to try different 'real' op amps to see which ...
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1answer
14 views

Finding the power difference of the current source E1?

When the switch is closed, the current I2 = 100mA, the task is to find Pe1 before the switch is closed and after it's closed and compare them. Now I know that $$\Delta ...
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2answers
80 views

Finding the voltage on a capacitor

Each capacitor is \$24\text{nF}\$ and I need to find the voltage on \$C_\text2\$. \$C_1+C_4=2*24=48nF\$ \$\frac{1}{C_\text{(1+4)||2}}=\frac{1}{C_\text{1+4}}+\frac{1}{C_2}=\frac{1}{16}\$ ...
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1answer
49 views

Input Resistance vs Output Resistance

I am having trouble understanding the difference between these two concepts. I know that input resistance is the resistance looking into the input terminals and output is looking into the output ...
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1answer
46 views

Op Amp balancing impedances

I know that I should balance input impedances in opamp circuits to avoid input bias currents from causing unwanted behaviour. I can understand how to do this in simple cases, but not in more complex ...
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1answer
20 views

Calculate the total charge

I'm previewing this chapter and I'm completely new to this. How do I solve for the answer? Can someone also please explain those $t<0 & t>=0$? I don't get time less than 0. From Nilsson ...
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1answer
39 views

Impedance of a circuit that contains a 2 port network

simulate this circuit – Schematic created using CircuitLab So, firstly, find the y parameters of a network ( says the assignment). Which I did. Now for the impedance I get the a ...
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1answer
28 views

Current through a short circuit in the Wheatstone Bridge configuration

The task was to replace part of a circuit with corresponding Norton's generator. To calculate the current of the generator, I had to calculate the current going through the short circuited nodes 1 and ...
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2answers
53 views

Reactive Power in Inductor and Capacitor

Suppose a RLC circuit with AC source. Why the net reactive power in the circuit is the difference of reactive power in the inductor and the reactive power in the capacitor ? As both of them store ...
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6answers
1k views

Why are crystal oscillators used in clocks instead of RLC circuits?

The timing of quartz clocks is regulated by a crystal oscillator. This crystal oscillator effectively forms an RLC circuit. If this is so, what properties does a crystal oscillator have that makes ...
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1answer
83 views

Finding output resistance

I am confused on how to find the output resistance of transistor amplifiers in general, but more specifically when it's a combination of different resistances. Here's an example (concrete) of the ...
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1answer
49 views

multivibrator frequency calculation

I have been playing/experimenting with this multivibrator circuit for days. Got some good results and also got many doubts. The npn I am using are S8550 with 100 gain. here are my doubts/questions: ...
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1answer
57 views

Help with superposition

I'm trying to replace a part of a circuit with the Thevenin equivalent. I managed to find Rth, but I'm not sure if my solutions for Eth are correct. I have 3 sources, so the logical method for finding ...
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2answers
43 views

Finding steady state response of LTI, dissipative systems

The input, \$x(t)\$, and output, \$y(t)\$ of a linear time invariant, dissipative system are related via the differential equation $$d^4(y(t)) + 6d^3(y(t)) + 14d^2(y(t))+14d(y(t)) + 5y(t) = - ...
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2answers
411 views

Is my design optimal?

I wanted to switch an LED ON and OFF using a signal from an Arduino. The LED was a high power LED, which I choose to overdrive with 100 mA with voltage source of 12 V. Forward voltage drop of the LED ...
0
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1answer
97 views

When Kirchhoff laws cease to be valid? [duplicate]

What are the situations where Kirchoff laws cease to be valid? How we can create circuits based on lumped element discipline, and that can work in real life? We take ideal conditions, but they just ...
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0answers
80 views

Current Series Feedback Calculation Puzzle

I'm following a text on negative feedback amplifier analysis and the author describes the following example of a current (sampling) series (mixing) feedback circuit; the humble CE amplifier: ...
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1answer
26 views

Find the thevenin equivalent resistance for the given circuit

I need to find the equivalent thevenin resistance, everything from the points A,B is exchanged.. however after I construct the image: It says the answer is Rth = 100 Ohm, but I can't figure out ...
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2answers
57 views

Thevenin equivalent E

I'm trying to find E Thevenin between points A and B. I found the Thevenin resistance, but I'm having trouble finding the voltage. Note that there were wires that connected the load resistor, but ...
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3answers
76 views

how does this circuit works

I think I understand left side of the circuit. It is a 2 stages amplifier with positive feedback via C2 and R3, but it's still strange to see how Mk1 and R1 are connected. normally, shouldn't the ...
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4answers
97 views

Reactive Power in the circuit

Why is inductive reactive power considered positive while capacitive reactive power is considered negative in the circuit ? Both inductor and capacitor consume apparent power so I guess ...
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2answers
61 views

Solving circuit DEs: derivative of inductor current should be zero, but isn't

I am in the process of solving a DE for a circuit. So: the circuit starts with a voltage source of 5 VDC and is allowed to reach steady state. At time t = 0, the source is switched out for a 10 VDC ...