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

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What are the failure modes of resistors, inductors, capacitors, diodes, transistors in conditions of overvoltage or overcurrent? [on hold]

What are the failure modes of resistors, inductors, capacitors, diodes, transistors in conditions of overvoltage or overcurrent? Example: ...
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81 views

How to make a 40mH inductor

We are working on a project that requires us to use a high-valued inductor, with at least 10mH and ideally 40mH inductance. There's nowhere in our area that sells inductors with these values, so we ...
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1answer
59 views

Rogowski Coil High Frequency Limit

I'd like to do some experiments involving high frequency (1.296GHz to be exact) that involve an 50ohm inductor that has minimal RF losses. The obvious candidate is to drive a Rogowski coil (driven as ...
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1answer
37 views

Modifying an amp evaluation board to bias the coax?

I'm normally a software guy, but a recent project requires me to dip my toe in the ocean of electrical engineering. I'm trying to (cheaply) capture GPS signals to process in software, and I have an ...
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2answers
51 views

A simple RL circuit, getting transfer function, matching with results

I'm doing little lab exercise with an RL circuit. I need to check if I did this analysis right, because the numbers I got and the numbers that should theoretically be there are so far off, I figured ...
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35 views

Odd MOSFET behaviour (in Multisim)

I have this circuit that's behaving in a strange manner. I am getting a surprisingly low current value flowing through the inductor when the path includes the N-channel MOSFET. Please could someone ...
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1answer
39 views

Testing high power inductors

We are using inductors in 180KVA converter circuits. To measure the inductance value of the inductor we are following the process of pumping the current up to 300A and voltage up to 30V. After ...
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72 views

current of inductor, a nice challenge

My professor calculate current of inductor in t=0^+. he calculated -1/30, but i reach to +1/30. anyone could help me? Note: (IL(0-))=0
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55 views

Calculate equivalent inductance

Here is my task: to calculate the equivalent inductance between A and B; I really don't know how (generally) this is solved. simulate this circuit – Schematic created using CircuitLab ...
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1answer
51 views

How to maximize inductance of a homemade coil?

So how can one maximize inductance of a homemade coil made out of copper wire? I assume adding a ferromagnetic core to the coil increases inductance? Also how can we calculate this inductance ...
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3answers
103 views

How to remove energy from inductor using semiconductors?

So I have this coil and I'm driving dc current through it. This coil has inductance and thus stores energy from the dc current. I have to remove this energy before I can change the polarity of my ...
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46 views

How do I solve for this circuit? (Coupled inductors)

I am trying to solve for the following circuit (mainly getting a function of voltage on capacitor C): However, I tried my best using node voltage method or mesh current method, in time domain and ...
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2answers
119 views

Inductor selection for obtaining a noiseless analog power rail

I interface an image sensor, and the design schematic for power supply is: How do I choose one from the available 3uH inductors based on the specs? I figured the maximum current and dc resistance ...
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3answers
139 views

What does an inductor's current stabilize to in DC?

As you can see from the below graph, after an inductor is turned on, the current is stabilized to approximately 6.5mA. My question is: what does the 6.5mA represent? Where did that number come from? ...
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1answer
35 views

PMSM inductance in DQ domain

The “abc <-> DQ” transformation matrix used for transforming currents, voltages and magnetic field can they be used for transforming inductances also? as given below-
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1answer
55 views

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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3answers
96 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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2answers
64 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 ...
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1answer
152 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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83 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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3answers
2k 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
107 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
77 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 ...
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1answer
78 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
84 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. ...
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1answer
58 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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1answer
144 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
46 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 ...
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1answer
48 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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82 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 ...
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3answers
169 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
70 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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177 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
151 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
84 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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63 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
174 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
65 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
41 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 ...
2
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4answers
206 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
133 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
216 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
49 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
184 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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101 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
130 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
80 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 ...