# Tagged Questions

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

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### Recommend resource to perform Mathematical calculation to learn and design small electronics circuits by myself [duplicate]

Basically I am a software engineer. But whenever I see any electronics device like FM transistor , LED dancing lights or TV remote control etc ,it attracts me very much. Whenever I get a free time , I ...
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### Replace hybrid-pi model with proposed Thevenin model

This lecture (page 10) shows how to replace hybrid-pi model with proposed Thevenin model. Could you tell me how to calculate $A_{v}$ to get the result as in the page?
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### Producing a sinusoid from a DC input

Here is a simple circuit that I have built which takes as input a DC voltage and gives out a sinusoidal output varying from -V to +V. It has three parts: (1) A LC circuit, (2) a buffer to isolate the ...
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### The Thévenin equivalent has an equivalent I–V characteristic only from the point of view of the load

I am reading about Thévenin's theorem on the page. As you can see from the Practical limitations section, there is a one shortcoming that I don't understand. The Thévenin equivalent has an ...
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### Why should we set input source equal zero for calculating output resistance of common source amplifier?

This lecture (page 10) gave derivation of common source output resistance. What I don't quite get here is why we should set the input source equal 0 for calculating output resistance. Could anyone ...
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### Optimizing regulator power circuit for low noise?

I am trying to understand the attached circuit. It's an ADP3333ARMZ-3.3-R7 regulator to provide 3.3V to an analog system. My goals is to have a very low noise regulator and power circuitry for a 16 ...
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### Open circuit resistance in common gate amplifier

I am reading about common gate amplifier on this page and there is a small signal model that I am a bit confused. The common gate amplifier and its small signal model is shown below. As you can see ...
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### Could anyone tell me what is the usage of the circuit within the red frame

The whole circuit is used for measuring voltage, but I am wondering what is the usage the circuit of the red section and how to analysis it? could anybody offer me some anlysis? Pleas ignore some ...
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### knowing which current value to use for finding resistor voltage [on hold]

why do i use the electric current value in V_0_ in the diagram instead of the current through R_2_
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### How to ignore pulse in a circuit

I have a 12v cable that sometimes pass (75%on-25%off) and other times 100%on. What can I put on that cable so if the input is (75%on-25%off) then the output is 0v, and if the input is 100%on the ...
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### Why is saturation region called so in BJT characteristics?

I understand base-collector (current) linear relationship is lost in saturation region and collector current will be lesser than $\beta * Ib$ . Hence,at max, we can call such a region as non-...
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### equivalent resistance on looking circuit from two different sides

I want to understand how to calculate equivalent resistance if same circuit is looked from two different sides,one from right side and then from left side and how to avoid confusions in this type of ...
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### When calculating the voltage in an AC Circuit, I get a different angle from the correct answer

Problem I'am trying to calculate v2 from the circuit below, but my answer, 9.81cos(1000t+166.64°) mV, has a different angle from the correct answer, 9.81cos(1000t-13.36°) mV. My approach I tried ...
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### I need to find the uppers and the lower bound of 3dB frequency

How can i find the upper and lower bound of 3dB frequency ?? I think I have to make first a small signal analysis including the capacitors Cgs,Cgd ..
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### Small signal equivalent circuit BJT question

This circuit is two BJT transistors in so called 'darlington configuration'. I want to analyse this circuit for AC signals (where the capacitors are shorts). The question is to calculate Delta_V_L/...
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### Two-port circuit analysis. Voltage gain [closed]

I am trying to find the general equations for the voltage gain(Not sure if it is the write word for it). My textbook offers an derived equation but not the procedure. I would appreciate it if someone ...
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### Asynchronous sequential circuits

How do I analyze a sequential asynchronous circuit? The yellow part is the one I don't get (I know how it works, but don't know how to write it when I do the analysis)
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### KVL with multiple source

I am looking at the problem in page 5 of this document. It is an example of KVL (Kirchoffs voltage law). The circuit is as shown below - . I have 2 questions - 1) Why is the voltage -5V ? Is it ...