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

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Design steps for a choke inductor

I want to filter out high frequency noise on my power line. At first, I was considering to use an LC filter on the line; but then, I learned about choke filters are used exactly for this purpose. ...
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80 views

Can inductor voltage and capacitor current change abruptly?

I understand that inductor current and capacitor voltage cannot change abruptly, but can inductor voltage and capacitor current change abruptly? I have a feeling the answer is no but I cannot explain ...
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57 views

Convert a ringing telephone voltage of 90V AC to 3.3V 1000mAh DC current so that it only triggers when the telephone is ringing?

How can I convert and step down a ringing telephone voltage of 90VAC current to 3.3V 1000mAh DC current so that it only triggers when the telephone is ringing? Bridge rectifier? Inductor? Step Down ...
2
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1answer
136 views

Re-winding an inductor to decrease inductance

I found a bunch of good size inductors in a bunch of old boards (16 of them, more to desolder). Luckily I had the service manual of said boards and I know the specs of the inductors: 22uH 9A 500V. I ...
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75 views

Question with solving for complex power, S, for each component

simulate this circuit – Schematic created using CircuitLab Hi! So I have a couple questions that I have already tried to solve that I think I am going in a little bit of the wrong ...
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1k views

What operation could cause the inductor or the capacitor to explode?

In really early days of electronic school, the teacher used to say something about not unplug power too quickly at an inductor or capacitor and we were used to slowly turn the voltage generator from a ...
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3answers
92 views

Low-DC-resistance inductors?

simulate this circuit – Schematic created using CircuitLab I have a 5V DC source that passes AC noise (alternator whine, spark plug discharge through the smoke-lighter-to-micro-USB ...
2
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2answers
73 views

Inductors in series with different currents

I'm having trouble finding the differential equation that describes the circuit, at t=0 10A flow through L1 and 0A through L2, since current can't change instantaneously. But they're in series so ...
2
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1answer
64 views

Calculation of inductance of rectangle coil

I'm currently working on a project about inductance. I want to calculate the inductance of a rectangle-shaped coil with a pitch different from zero. I tried this by applying the law of Biot-Savart. If ...
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2answers
82 views

Quiet inductors?

Are certain types of inductors more likely to create an audible sound than others when under use? Is there any sort of best-practice or guideline to minimize such humming or buzzing sounds? I.E. ...
2
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1answer
52 views

Electromagnet for string vibration

I recently read a lot about guitar sustainers, for those who don't know what are they - it is basically an electromagnet with an amplifier. It takes an input from pickup, amplifies it and then ...
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45 views

Check My Inductance Calculation

I'm trying to find the components for a buck step-down converter. I found this equation online to calculate inductance. * L=(Vin-Vout)(Vout/Vin)(1/fsw)(1/(LIR*Iout)) Where L is inductance, fsw is ...
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132 views

What is this inductor-like part?

In a laser printer's power supply board I have desoldered some of these passives. I think it is a inductor, because it's legs aren't exactly aligned and the round body could be the coil. Does ...
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1answer
36 views

Running single-phase through two or three windings of a three-phase inductor; why does the direction of the middle winding matter?

I have a three-phase inductor, MTE RL-00403, nominal 9 mH. I have some experimental results that don't make sense to me, which appear to be related to the fact that all three chokes share a single ...
3
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1answer
44 views

Inductor value given in OHM/Amp

I've been trying to figure out the inductance in Henries from a schematic of a Rabbit Microprocessor development board, however, instead of finding an inductance value over the components in question, ...
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0answers
67 views

Floating Inductor Simulation Using Only BJTs?

I know it is possible to replace large-ish floating inductors (~ 5mH) with a gyrator, typically using two opamps: What I've unsuccessfully tried to solve is : can we build something equivalent to ...
3
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3answers
148 views

Inductor selection for a switching regulator

This is somewhat related to this question, but hopefully a bit broader. I'm selecting components to fill out an lm2734. This regulator will take a 9-12V (11.1V nominal) input down to 5v @ 1A max. ...
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1answer
55 views

Single Phase Diode Bridge Rectifier - Inductive Smoothing Question

So I don't understand how the answer is 2.124 volt-seconds when if you put the equation through a calculator it comes out as -0.174. Is there an additional mathematical step to do on the cosines in ...
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16 views

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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135 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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2answers
148 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
76 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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60 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
134 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 ...
2
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2answers
62 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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0answers
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
40 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
203 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
111 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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1answer
181 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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1answer
47 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, ...
2
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1answer
109 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
93 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
124 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
74 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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0answers
68 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
133 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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2answers
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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3answers
374 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
81 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 ...
2
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1answer
82 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 ...
5
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2answers
525 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
40 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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2answers
135 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 ...
3
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4answers
550 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
123 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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222 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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63 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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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
94 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 ...