# Tag Info

Accepted

### I think I found an error in an electronics book. Are my equations correct here?

Standard Form Over some time, standard forms have been developed for these equations. There's a reason why. But I'll get to that in a moment. The usual 1st order low-pass standard forms for your case ...
• 78.3k

### How does this trick to finding the Thevenin Resistance work?

You're not really short-circuiting the voltage sources - the voltage sources are already presenting a zero impedance to the circuit. You're just setting them to zero voltage so that the output voltage ...
• 168k
Accepted

### Thevenin Equivalent Voltage: why ignore the 3-kΩ resistor?

Computing a Thevenin Equivalent requires two steps: Obtain the Thevenin Impedance $Z_{TH}$ Obtain the Thevenin Voltage $V_{TH}$ In order to compute $Z_{TH}$ you have to "turn off" the ...
• 236
Accepted

You are in good company. The maximum power transfer concept frequently causes confusion. Take note of the fact that maximum power transfer does not mean maximum power efficiency. I think this may be ...
• 29.4k
Accepted

### How does this trick to finding the Thevenin Resistance work?

This is a classic example of superposition as applied to linear systems - if you consider your circuit as a function mapping excitations (the voltages and currents of independent voltage and current ...
• 20.1k

### Thevenin Equivalent Voltage: why ignore the 3-kΩ resistor?

The Thévenin voltage is also known as the "open-circuit" voltage. In this case, the open circuit is between points A and B. Because it's an open circuit, no current flows through the 3k resistor, and ...
• 3,636
Accepted

### Hysteresis on inverting terminal for comparator circuits?

Here are the two scenarios you describe, one with negative feedback (left), the other with positive (right): simulate this circuit – Schematic created using CircuitLab The only difference ...
• 37.7k

### Hysteresis on inverting terminal for comparator circuits?

The point of hysteresis is to reinforce the output state using the input, so that if the input signal has a small amount of noise on it, your output does not change state due to that noise. The ...
• 780

### Thevenin Equivalent Voltage: why ignore the 3-kΩ resistor?

The Thevenin voltage is when the output terminals are open-circuit so any series resistance (3K in this case) has no effect. We can also ignore the 4K resistor since it's in series with a current ...
• 405k

### I think I found an error in an electronics book. Are my equations correct here?

The book is wrong. You are right. You can verify by punching in random sets of sets of values into the left-hand side and right-hand side. They are off by a factor of 1/R. It doesn't even need to be ...
• 56.8k

### Calculating resistor's current and voltage using Thevenin's theorem

First thing I want to say to you: electronics is only one of my hobbies. I'm not an EE and I've only a high school education. If anything, my own life is all about CS, too. That, and solving certain ...
• 78.3k

### How does this trick to finding the Thevenin Resistance work?

Consider this: - Would you say that the Thevenin resistance looking into the A and B terminals is any different if the voltage source was 36 volts or 1,000,000 volts? Would you say that the Thevenin ...
• 463k
Accepted

### How to analyze this RC circuit without finding Thévenin's equivalent circuit?

KCL Here's your re-drawn schematic (I'm in the practice of re-drawing schematics as a rule): simulate this circuit – Schematic created using CircuitLab My KCL sets up like this (treating your ...
• 78.3k
Accepted

### Resistor in parallel with a short circuit. Will current flow through it?

If the short circuit is perfect, the two leads of the resistor are at the same Voltage potential. In that case, no current can possibly flow through the resistor, no matter how much current you run ...
• 2,838
Accepted

### BJT four-resistor bias circuit analysis, parallel resistors

Thevenin's theorem applies as follows:
• 1,497

### How do we derive the values for these Thévenin equivalent circuits?

The circuits are completely different, one has voltage source and the other has current source. As explained in the text you quoted, voltage supplies have zero impedance, and current supplies have ...
• 155k

### Determine Thevenin's equivalent circuit

Step by step. Don't need text but rules say 30 char.
• 467

• 78.3k