# Questions tagged [circuit-analysis]

Circuit (Network) analysis is the process of finding the voltages across, and the currents through, every component in the network. Consider using in conjunction with tags for the particular analysis technique(s) in question: "nodal-analysis", "mesh-analysis", "superposition", etc.

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### How do I use superposition to solve a circuit?

Yes, this is a pedagogical question. While answering another recent question, I wanted to refer the OP to concise instructions for using superposition to solve circuits. I found that all the easily ...
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1 vote
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### Diode Circuit Analysis Conflicts

I am very confused about how to analyze diode circuits. I have read sources that claim the voltage drop across the diode to be 0.5-0.7 V but this seems to be inconsistent with what happens when ...
9k views

### Logic level converter using Transistors

I am trying to make a logic level converter using transistor BC547. This is to convert Voltage level of Rpi Gpio from 3.3 to 5V. I have wired the circuit according to this diagram: I have done this ...
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6k views

### Why is the voltage of a capacitor equal to the voltage of a battery connected it?

I am confused by this question. If we connect a resistor in series to capacitor then the voltage will drop across the resistor and now voltage across the capacitor is less than the source, then why ...
6k views

### How do you determine the effective resistance of a finite grid of resistors?

Disclaimer: I am a geophysicist with limited electrical engineering background. I am not sure if this problem is incredibly easy, incredibly complex, or completely nonsensical. My goal: Determine the ...
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### Is this an astable multivibrator?

In this circuit the LED flashes on and off, however could it be classified as an astable multivibrator?
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### finding the output resistance of bjt folded cascode

I am being asked to find the output resistance of following BJT cascode amplifier, from "Microelectronic Circuits" by Sedra and Smith, 7th edition, problem 8.80.a on page 588. Now I decided to ...
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13k views

### Help dimensioning resistors in a two NPN transistor current limiter circuit

I'm trying to design the current limiter circuit shown above which I saw on this website: http://electronicdesign.com/power/current-limiter-offers-circuit-protection-low-voltage-drop I'm using 18V - ...
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183 views

### Norton equivalent with a single voltage source

I'm trying to find the Norton equivalent with respect to the load resistor RL for the DC circuit below. Each of the resistors have an equal resistance R. Removing the load resistor, I am having a ...
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601 views

### Algorithm for substituting any resistance network to one resistance

I am wondering what the common approach is to substituting any resistance network to one resistance only given that the a voltage is applied between two random nodes. For example this network took me ...
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804 views

### Analysing a circuit to determine what is in series or in parallel

This is probably a very basic question but I have the following circuit, I am not sure what is in series and what is in parallel or if they are all in parallel, initially I thought R2 and R3 were in ...
1 vote
404 views

### How do I derive the transfer function of this circuit in terms of its corner frequencies?

How would I derive the transfer function of this circuit in terms of its corner frequencies? Edit: The solution I am trying to derive is the following
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### Is there current flowing through this blank wire?

simulate this circuit – Schematic created using CircuitLab Does any current flow from point A to point B? My guess is no. Because both of those points are connected to a ground symbol by ...
1k views

### Biasing in common-emitter amplifier

I'm having trouble understanding the biasing of the common-emitter amplifier as depicted below: (Image source: Electronics Tutorials - Common Emitter Amplifier) I keep reading that we should bias ...
10k views

### What is a flip flop?

There seem to be a number of different definitions of flip-flops and latches out there, some of which are contradictory. The Computer Science text book for the course I teach is probably the most ...
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### How to calculate for how long an LED emits light when in series with a capacitor?

Given the following DC circuit with a fully discharged capacitor ($V_c(0) = 0 V$): How can I calculate for how long the LED emits light until it "turns off"? The LED is a red one with a ...
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### Does ground pour circumvent bypass capacitors?

I am working on a two-layer PCB with ground pour in both layers. A few of the components recommend using bypass capacitors. Going off of this guide, I understand that it is important that the current ...