Questions tagged [inductor]
An inductor is a 2 terminal passive device that stores energy in a magnetic field.
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1answer
49 views
How i can make transmission line from inducor and capacitor [on hold]
The questions are:
How can i make an inductor using transmission line?
How can i make a capacitor using transmission line?
0
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2answers
64 views
What should be the sign of the voltage across the inductors while doing circuit analysis?
I am not able to understand what should be the sign of the voltage across an inductor while doing circuit analysis. I know the voltage across an inductor is given by -Ldi/dt, when the rate of change ...
4
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1answer
184 views
Undescriptive capacitor and inductor values in audio-amp datasheet
I was learning about audio amplifiers and came across the STA516B IC. To my surprise, the example circuits feature some values for capacitors and inductors which seem a bit high for me. So I wanted to ...
1
vote
0answers
45 views
power surge protection
I've seen power protection that uses:
MOV (metal-oxide varistor)
Inductor
TVS diode
Application Note: Transient Voltage Suppressors (TVS Diode)
Applications Overview
I didn't see any design ...
1
vote
2answers
72 views
Combining two ideal voltage sources with an impedance between them
Solving a problem, I came across the following source transformation:
My question is:
I know that I can do the following:
&...
2
votes
1answer
49 views
Source transformation with impedance being inductor or capacitor
I found a presentation that states the following about source transformation when the impedance is capacitive/inductive:
While electrical circuits books, like Nilsson's, says:
If I transform the ...
1
vote
2answers
78 views
Inductive kickback
I know this is a very basic concept, and has been described in many places, but I still can't 100% understand inductive kickback.
simulate this circuit – Schematic created using CircuitLab
If ...
0
votes
1answer
48 views
How can I change component values in a premade circuit
I do projects quite frequently, but the only problem is that sometimes I don't have the right component, and it takes to long to ship. I heard that some people change the values of their components (...
-1
votes
1answer
82 views
What will be the behavior of this circuit?
i have a circuit for which i have simulated its output. But i can't seem to understand how it works.
Here is the circuit..
simulate this circuit – Schematic created using CircuitLab
For ...
0
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0answers
49 views
How to calculate the self capacitance of a flat spiral coil?
I am trying to design a wireless charger and I have to find the resonance frequency of the flat spiral coil. The formula is this one:
ƒr = 1/(2*pi*√(LC)) . So I need to know the inductance of the ...
0
votes
1answer
65 views
How do you model differential inductor in LTspice?
I wonder how I can model a differential inductor in LTspice?
I've an inductor that has half the turns on one side and the other half on the other side.
It's intended to be used in a bridge tied ...
0
votes
0answers
53 views
Can an inductor couple energy to a speaker through a PCB?
I am designing a circuit where I have, among other things, an AC/DC buck converter (Iout_max = 250mA) and a transducer.
I am drawing the PCB layout and I have the following situation:
The inductor ...
0
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1answer
58 views
Can someone explain how frequency and inductance affects this pair of coupled inductors?
I am simulating this simple circuit on PSIM; a single-phase AC voltage source connected to the primary of a pair of coupled inductors, with a 12 Ohms load on the secondary side. I want to increase the ...
0
votes
1answer
56 views
RL circuit analysis
This is an exercise in my final assignment:
According to some of my searches, the voltage source that has negative value is connected to the ground. Therefore, my idea is to connect R1, R3, R4 and L ...
-2
votes
2answers
29 views
AC Circuits: Determine the RMS current in the Inductor in the circuit diagram attached below. (Voltage is 40V, RMS)
Here is the image of the circuit diagram. I wanted to know the method to evaluate the RMS current in the inductor branch. I would prefer to use complex analysis!
0
votes
1answer
63 views
Black Box Measure
This black box show in the next figure can be created with logic gates, op amps, PIC, FPGA (Basys 2), nevertheless you can’t use any kind of digital - analog converter, the signal obtained on the ...
0
votes
1answer
47 views
Inductor choice for passive filter
I need to design a band-pass passive filter with pass band 10kHz~150KHz. One of the needed inductor is 2.2mH. I find there are two choice: Axial type or Can type. But it seems they are designed mainly ...
0
votes
1answer
48 views
How does adding more coils to an AM tuner coil allow it to tune Shortwave?
I have seen several tutorials about how to turn an AM radio into a Shortwave radio. They add more coils to the inductor (is that the correct name for the tuning coil?).
Here is one example,
https://...
2
votes
1answer
97 views
Can this 1000W ballast be wired for 240V and plugged to 120V to run a 400W MH Lamp?
I've a 1000W MH ballast. Is it okay to use the wiring for 240V the ballast and use it on 120V? Like does it reduce the ballast to 500W?
I've attached a video for better understanding of how the bulb ...
3
votes
1answer
68 views
Understanding an ultrasonic piezo driver circuit
[Disclaimer: I'm okay-ish with digital electronics, but somewhat a noob with analog stuff. Since this circuit is a) pretty simple and b) still covers both areas, I was hoping that somebody here could ...
1
vote
1answer
26 views
How to choose correct inductor from calculated values for a TPS562219 stepdown
I'm trying to build a step down module with a TPS562219: http://www.ti.com/lit/ds/symlink/tps562219.pdf
On page 14 there is the reference design and on page 15 I can calculate the values Il p-p, Il ...
-3
votes
1answer
49 views
Confusing phasor representation
Why capacitive impedance has the magnitude \$Z_{c} = \frac{-j}{\omega C}\$ but in the phasor diagram, we represent it as a vector pointing in the upward direction?. Same is with the case of an ...
0
votes
2answers
45 views
Graphical method for obtaining waveshape of current
I was doing exercises of the book Electrical Engineering Fundamentals by Vincent Del Toro. Then I saw this question.
The voltage waveform shown in fig is applied separately to a pure capacitor of 1 F ...
1
vote
2answers
39 views
Can I create a continous gap in iron powder cores?
The iron powder core material, as you may know, has a continuous air gap in its structure. However, do you think it is possible to add a continuous air gap (for example 1mm) to the iron powder cores?
...
0
votes
1answer
32 views
Neglecting certain elements in deriving the current of a series RLC circuit
The current at resonance in a series RLC circuit is described in the bottom derivation, along with it being plugged into the formula for finding the voltage across the inductor in the circuitw:
I ...
1
vote
1answer
55 views
Step Down Switching Regulator irregularity with ripple on output
Using the L5973D- I have followed the Schematic as the datasheet instructs, but I have tried two different inductors. I have found problems with other systems on the board with the one inductor (744 ...
1
vote
3answers
84 views
Power of audio amplifier not matching specifications
I have a Cerwin-Vega CV-2800 audio amplifier which is rated for 600 watts at 8 ohms, 900 watts at 4 ohms, and 1400 watts at 2 ohms. I also have two PWR247T-100-1R00F 1 ohm resistors rated for 100 W; ...
1
vote
2answers
52 views
Eliminating the resistance variable in the total resistance/reactance equation of a series RLC circuit
Assuming that we have a simplified equation from a simple series RLC circuit where the total resistance/reactance in the series RLC circuit is equal to 100 times the resistance R:
How do we modify ...
0
votes
1answer
69 views
Simulating a variable mutual inductance model
Can we simulate a time varying mutual inductance in Matlab Simulink (or any other simulation tool).
Matlab Simulink has a variable inductor, but I could not find not mutual inductor.
0
votes
0answers
70 views
How does the capacitor charge and discharge in this configuration?
I wanted to build a metal detector using 555 timer and I found this circuit online along with a video of the working model. It says that the timer works in astable mode. But since the capacitor is not ...
0
votes
2answers
61 views
Differences between inductor and electromagnet?
This seems like a very stupid question but I have to clear my doubts.
When we connect an inductor of like 6-7 turns to a DC battery, the battery gets shorted out. But when we make an electromagnet of ...
1
vote
1answer
88 views
Choosing inductor to limit inrush current
I have a 12V DC input to a circuit. There is a 660uF Aluminum cap on the input.
The 12 volt source is not in my control and can come from anywhere. So it could be a noisy source or a high current ...
0
votes
2answers
70 views
Is Joule Thief a constant current source?
Wikipedia describes Joule Thief, shown below, as a circuit that can be used to provide constant load even when voltage of a battery decreases. At least that's what I think the article means.
simulate ...
0
votes
1answer
33 views
Driving an RL circuit with an audio power amplifier
I'm using a Cerwin-Vega CV-2800 audio amplifier to drive the RL circuit depicted in the diagram below:
simulate this circuit – Schematic created using CircuitLab
The amplifier is rated for ...
0
votes
1answer
33 views
Trying to solve a RL circuit by hand but simulator calculates a value I do not understand
I have this circuit. V3 is just a trigger to close the switch, just ignore it.
The switch is open for a long time. So, the left part of the circuit is working for a long time and the inductor is ...
11
votes
4answers
2k views
What keeps the kickback voltage from reaching an infinite voltage?
We know that the voltage over an inductor is defined by the formula:
\$V = L * \frac {di}{dt} \$
So in the case where the current flow is suddenly interrupted (like when a mechanical contact is ...
0
votes
2answers
88 views
Can I use rectified AC current to heat an object inside a induction coil?
The reason why I would like to use rectified AC is because I want to keep the magnetic field inside the coil unidirectional. A changing magnetic field induces current in the coil and vice versa. ...
0
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0answers
35 views
PFC CCM - highest possible frequency
When I study PFC types, and I can’t understand why in datasheets related to most CrM PFC controllers (and even interleaved PFCs) it is all about minimum frequency.
If I understand correctly, PFC ...
0
votes
4answers
143 views
Is it possible for a bulb to behave like an inductor?
I have learned that the bulb has made from a coil of tungsten, not only bulbs many other components like electromagnet and electric motors also have coils in it. Is there a multiple behavior for this ...
0
votes
1answer
64 views
Inductor Coupling Question
I want to prove that a voltage signal I apply in the primary of an ideal transformer(or 2 coupled coils) will produce the same voltage signal in the secondary, e.g. a square wave(+- V) in the primary ...
0
votes
3answers
60 views
How does the voltage drop to negative values at t = 0 when the voltage starts with 0 V?
I understand that the voltage in the inductor is 0V because it behaves as a wire with a constant dc source while the switch is closed. But why does it drop to a negative value when the time t = 0 and ...
0
votes
1answer
34 views
Direction of current in a LR circuit
Assume the easiest circuit with a voltage source U(t), a inductor L and a resistor R in series. The voltage source is function of time.
We can have a differential equation:
$$U=I'L+IR$$
But the ...
1
vote
2answers
92 views
How do you model a “leaky inductor”?
My understanding is as follows:
A voltage induces an electric field at a capacitor, which is measured in coulombs. If I wanted the capacitor to leak the charge exponentially, I could model that as a ...
0
votes
0answers
44 views
Value of Green as Multiplier for an Inductor Color code
I was going through the Internet searching for the Color code table for an Inductor.
The more or less same table which I got is :
I have got an inductor :
So I cannot find out the Value of this ...
0
votes
1answer
102 views
Why do XC and XL need to roughly match in an LC tank?
In an LC tank circuit, why do XC (XC1 + XC2) and XL need to be roughly similar?
For example, in this Colpitts Oscillator taken from https://www.electronics-tutorials.ws/oscillator/colpitts.html, I ...
1
vote
2answers
76 views
Inductor on VDD pin
I have found that schematic.
On the VDD pin of the processor, there is an inductor (L1). Could someone let me know what is the role of the inductor there? Usually, reference diagrams on such kind of ...
0
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3answers
142 views
RL-C Circuit Problem
I am trying to get some practice on the basics, but i am having some issues with the following question:
Find Currents I(1) and I(2) and show them on a phasor diagram.
Find the total current, I(total)...
0
votes
1answer
56 views
LC Parallel Circuit with current source in steady state
I understand that ideal inductor behaves as a short circuit at steady state and the ideal capacitor keeps on filling infinitely. I read that the inductor will be short circuit and capacitor will be ...
1
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1answer
73 views
Inductor induced voltage understanding
I've been studying inductors and wanted to understand the behavior as a circuit is switched off just like the one below, when the transistor is normally conducting and suddenly is turned off by, say, ...
1
vote
3answers
161 views
Use of inductor for filtering
The number of capacitors and an inductor are used at the input side(forms pi-filter) for filtering, in order to reducing electrical noise, frequency noise, switching ,etc. This type of filtering ...
