An inductor is a 2 terminal passive device that stores energy in a magnetic field.

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Noise in Inductor Current : Buck Converter [duplicate]

Source DC: 300v DC Output DC required : 160v DC Load Current : 7A DC Buck Converter Topology : IGBT as switch @ 8khz 1.1 mH Ferrite Core Inductor Measured Inductor Current ...
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84 views

Spikes in Inductor Current : Buck Converter

What could be the reason of such spikes in inductor current at each Switch ON-OFF. ?? This spikes are also getting affected in load current. Please help me to reduce / remove this spikes. ( ...
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131 views

A cubical LC circuit

I would like to solve for currents through inductors and the voltage across capacitances of the attached circuit. I am trying to figure out a correct method to solve such circuits which could have the ...
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2answers
71 views

Why Inductor reactance 180 ohms?

Why is the inductor reactance 180 ohms for designing Voltage controlled Oscillators ( or oscillators maybe ?) I came across a few resources for designing oscillators, colpitts and hartley ...
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1answer
54 views

Common Mode Inductor Inductance?

I want to buy a 1mH inductor. I am just making a basic LC filter and I see that there are "common mode" inductors. I found one here with a data sheet: ...
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2answers
86 views

What is the low frequency limit for ferrite cores in audio applications?

I've searched high and low through the ferrite magnetics catalogs and this list for an answer and can't find data on ferrite core permeability below 10kHz. My application is for audio use and I need ...
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2answers
48 views

Read/calculate permebility from BH curve

I need to find the permeability from a non-linear BH curve. B is given in mT. and H in A/m.
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56 views

Is it practically possible to use mutually coupled capacitors as we use mutually coupled inductors? [duplicate]

Inductor and capacitor are dual to each other in Physics. One comes from Electric Field Theory while the other one comes from Magnetic Theory; the both theories expose strong duality with each other. ...
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1answer
36 views

Formulae for induced back-EMF

I'm doing AC theory, and I'm looking for different formula to find induced back-EMF. Given inductance, voltage, current, frequency, I'm able to find inductive reactance, current and voltage on each ...
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4answers
197 views

Estimating Inductance

Here is an inductor I found lying around, and I have no idea what the inductance is. In order to estimate the inductance, I am using the equation \$L=\mu \dfrac{N^2 A}{l}\$. Here are the relevant ...
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2answers
100 views

Finding the Equivalent Inductance Across the Terminals a and b with a Wire Included

Find the equivalent inductance looking into the terminals a and b of the circuit below. ( Answer : L(eq)= 7H ) Now I try to transform it to be the following. simulate this circuit – ...
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104 views

I need to create a planar inductor with a specific value of 28 nH on a 4-layer PCB. How do I determine the proper trace geometry?

I am using a Linear Technologies LT-1534 part an need to create a planar PCB surface inductor with the specific value of 28nH; i.e., the inductor will be a copper trace on the PC boards Top Surface to ...
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37 views

What values can I change when replacing a 200uH 2Amp coupled inductor?

I am replacing a coupled inductor (with corrosion on it) on a liquid handling robot board, in hopes to fix a blowing fuse problem. The part number is not coming up in any search I have tried so far, ...
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1answer
72 views

Calculate Capacitance in inductors

I have an air core inductor, and I need to know the capacitance for a tesla coil design- "Secondary Coil Capacitance", not the Top Load capacitance, though. I have already figured out the inductance ...
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2answers
69 views

300W Boost converter design

I am designing a boost converter. I know maybe the specs I want would suit better in another topology like Half-Bridge or Full-Bridge but the boost topology is simpler and inductor winding is simpler ...
2
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2answers
101 views

How do you calculate the value of the inductor and capacitor in a parallel LC circuit?

There is a parallel LC circuit with unknown values for the inductor and the capacitor. How exactly can I identify the value of the inductor and capacitor? I know I can apply an sinusoidal function ...
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1answer
65 views

Does winding a choke inductor produce a transformer?

I obtained schematics and build instructions for a device which generates low current, high voltage (50-100V) signals. The high voltages are generated from a normal 5V USB supply. The instructions ...
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50 views

Iron Core in LTSpice

I'm currently assembling a circuit in LTSpice which makes use of iron core transformers and inductors. There's only 1 type of inductor in LTSpice, which is also used to make the transformer. I would ...
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1answer
118 views

Axial inductor vs winding inductor

I'm doing my DIY project as an FM transmitter. When finding somewhere to buy a winding inductor, I found another type of inductor called 'axial inductor'. It's very strange to me; if it's an inductor, ...
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50 views

How can I tell if my current is continuous in a first order DC circuit with a switch

Assuming this circuit has been running for a long time (switch SW1 is closed), and in t=0 the switch (SW1) opens, and I'm being asked about the current that runs through the inductor L1. I know that ...
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352 views

Why is inductance (L) proportional with turns-square (N²)?

We start from the Maxwell's Equation $$ \mathbf{\nabla} \times \mathbf{B} = \mu \mathbf{J} + \overbrace{\mu \epsilon \dfrac{\partial \mathbf{E}}{\partial t}}^0. $$ We take surface integration of ...
2
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1answer
52 views

Polarity of the induced voltage on inductor for an applied magnetic flux according to the Lenz's Law

I'm trying to visualize the Lenz's Law on a practical inductor. The Lenz's Law says that $$ \mathcal{E} = -\dfrac{\partial \Phi}{\partial t} . $$ Now, assume that there is a magnetic flux inside ...
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1answer
76 views

Simple resistors, inductors first order circuit

Asuuming the following circuit has been turned on for a long time: I need to find the current Il=current that goes through the inductor. I know that the indoctor acts as a short circuit, but i still ...
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2answers
305 views

How to visually tell the difference between axial inductors and common resistors?

Is there a simple way to tell axial inductors and resistors apart in through-hole type PCBs? I do find the color code on both very confusing. Is there an obvious difference that I am missing? As a ...
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1answer
37 views

coupled inductor in series

I'm planning on using a dual inductor in series mode to increase the inductance. I realize that the total inductance will be L1+L2+2M where M is the mutual inductance (when the polarity is connected ...
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116 views

Value of inductor

I need to wind an inductor with a value between 47uH - 200uH. I have a 10 mm (in diameter) ferrite core from an RF choke used in an old radio (probably lossy ferrite). The core is 3 cm long (I also ...
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549 views

Shorts in parallel - out of curiosity

Normally a current would take a simpler route, hence why a resistor in parallel with a short gets no share in current. Again two equal resistors in parallel get equal share in current. These ...
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1answer
105 views

Where to salvage inductors?

I need a toroidal inductor for my ZVS flyback driver. The value should be between 47uH to 200uH. It should be able to handle 6A. Where can I salvage them from?
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3answers
168 views

Inverse Laplace Transform of RLC Circuit

The voltage across the power source equals the summed voltage across the resistor, capacitor, and inductor at any time (t). This is shown in the equation below: ...
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1answer
55 views

Axial inductor between the plates of a cylindrical capacitor

What happens if you put an axial inductor between the plates of a cylindrical capacitor (capacitor supplied with AC signal)?
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90 views

Inductor specifications for AM circuits

I am working with the book "Build Your Own Transistor Radios" by Ronald Quan in which he has a lot of AM projects. I am having a hard time figuring out what I need to buy from his specifications. For ...
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2answers
90 views

what will be the resistor to find the time constant?

simulate this circuit – Schematic created using CircuitLab What resistance should I use to find the time constant? is it 30 ohm or 1130 ohm? what if the capacitor is an inductor will I be ...
3
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1answer
76 views

How to find the complex power for a current source?

The relevant circuit is shown below, We should first find the complex power delivered by the independent source. I derived it but my answer was different than the answer given. So, I am wondering ...
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121 views

Properties of inductors with a magnetic core

If I take an Iron core,for example a simple nail, and coil wire around it, I create an inductor. Now if I strongly magnetize the iron core, will any properties of the inductor change?
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45 views

impact of inductor and capacitor at resonance [closed]

It is said that inductor and capacitor cancle each others effect during resonance bt do they still have any effect on the circuit??
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2answers
157 views

Would using litz wire for an inductor change the inductance compared to regular wire?

Litz wire is multistranded wire where each strand is insulated from the others along the wire's length, but they are connected together on each end. This is useful primarily to reduce the skin ...
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1answer
161 views

How to create this copper coil to withstand much heat

Hopefully this is not as off topic as it might seem. Some background information: I've created the coil below to use as an induction heater from regular 230Vac household insulated wire. The coil is ...
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1answer
152 views

Why do inductors release a high voltage when disconnected

I take a 12 volt battery, take a strong electromagnet, and fire it up. I then touch the two terminals that are currently connected, one terminal of the battery, and one terminal of the electromagnet. ...
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133 views

Inductors Vs. Capacitor [closed]

What are the advantages/disadvantages of using a capacitor in filter circuits instead of other passive elements?
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1answer
72 views

What are important inductor parameters to specify for use in a matching circuit?

The title could be more clear: I have a matching circuit but the datasheet is restricted. I'll post a reference matching network as a schematic here. simulate this circuit – Schematic ...
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1answer
97 views

How do I calculate the hysteresis losses of a straight line inductor?

In using a particular type of conductor for an antenna in AC frequencies between 3MHz and 30MHz (HF), it was suggested that magnetic hysteresis losses may be significant if the permeability of the ...
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1answer
74 views

Am I right in analyzing this simple RL circuit?

I'm given this circuit which is in steady state: At some point the switch closes. What happens to the voltage across the inductor and the current through it? Well, the way I see it is that if the ...
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2answers
131 views

RL circuit paradox [closed]

I can't understand why current flow through an inductor in RL circuit if this inductor induces EMF to block it? Well, the current at t=0 is 0 but how the current increases seems to be paradoxal :( ...
3
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1answer
169 views

Inductor with Ground Shield

I am having some problem with one of the boards I am working on, the noise from the inductor is coupling to an analog circuit and I was wondering if there are inductors that has a ground shield. I ...
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1answer
580 views

50/60Hz inverter output inductor design

Given a SMPS PWM inverter (for example an UPS) supplying voltage/current at 50/60Hz, how do you design an output inductor? I don't mean how you compute its value in uH/mH nor its current rating in A. ...
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2answers
110 views

How does a capacitive receiver work for a fox and hound set?

I have been scouring the internet trying to find this answer, I've found hints and ideas, but nothing concrete, like an actual theory of operation. I'm making a fox and hound wire tracer for my final ...
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2answers
78 views

Initial current in an RL circuit

I would like to confirm that I am going about this exercise the right way. "After a long time of being open the switch closes at t=0. Find $_L(s) and i_L(t)." (See picture below) Do I need to take ...
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1answer
802 views

How to use Boost Step-Up Converter MC34063

I am trying to use a MC34063 switching regulator to step-up 5v to 12v. I have wired it up as shown below, I think its the same as the datasheet. But I only get ~4 volts out. I know the capacitors ...
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2answers
105 views

low-cost idea for Identifying passive tags by inductive coupling/pulses

Hi electronics experts, I want to build a circuit that can identify few (4-10) tags wirelessly by proximity. No need for multiple simultaneous detection. I don't need any memory on the tags - just a ...
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3answers
992 views

What is the difference between a transformer and a coupled inductor?

Transformers and coupled inductors seem very similar. Is there a difference in construction? Or only in use? This question asks something similar, but the answers don't address my question: Coupled ...