Tagged Questions

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

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1answer
68 views

Inductor held with hands

I have a fairly simple problem, but as I am a newbie in electrical circuits I was hoping someone might help me understand the principles of things. I have a circuit with an inductor of L = 0,102H a ...
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0answers
30 views

Is this an antenna or an inductor or both? And does the wire length/core diameter matter?

I have a small transmitter, and attached to it is this device: However, one of the wires attaching the circuit board to to circular red device is broken. I figured that since I have it all taken ...
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2answers
80 views

Why don't over damped and critically damped circuits oscillate?

The reason underdamped LRC circuits oscillate is because the energy keeps flowing between the inductor and capacitor. The energy is being constantly exchanged between the capacitor and inductor ...
0
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1answer
26 views

Inductance in Transformers inductors

How can I find a transformers inductors value by using the derivative formula? If I want to generate high voltage spikes from a square wave generator of 10V p-p with a source resistance of 50Ω. I want ...
2
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2answers
45 views

Inductor burning out in a GPS bias tee circuit

I've got a tracking device that uses a Telit GE864-GPS combined GSM/GPS module. The GPS antenna is connected to the Telit module via a bias tee circuit, as shown below: ...
0
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1answer
30 views

Is it possible to design cascaded LC filters with inductors sharing the same core?

I want to design an higher order LC filter for filtering out a power signal. In the theoretical design, the inductors are supposed to be on separate cores. But in practice, it will be very costly and ...
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3answers
95 views

Is Faraday's Law not working?

Faraday-Lenz's law was easy when I was in 12th standard. But it became more complex when I jumped to Engineering. Recently when I was studying about inductors and how they oppose changes in currents, ...
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1answer
89 views

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

What are the failure modes of resistors, inductors, capacitors, diodes, transistors in conditions of overvoltage or overcurrent? Example: ...
0
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1answer
88 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 ...
2
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1answer
63 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 ...
0
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1answer
42 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 ...
2
votes
2answers
66 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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0answers
41 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 ...
1
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1answer
40 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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0answers
75 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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0answers
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 ...
0
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1answer
58 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 ...
0
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3answers
105 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 ...
0
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0answers
47 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 ...
4
votes
2answers
125 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 ...
0
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3answers
146 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? ...
0
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1answer
37 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-
0
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1answer
65 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. ...
0
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3answers
103 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
68 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
votes
1answer
155 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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2answers
86 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 ...
2
votes
3answers
109 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
votes
2answers
79 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
votes
1answer
86 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 ...
3
votes
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. ...
2
votes
1answer
62 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 ...
0
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0answers
46 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 ...
0
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1answer
152 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 ...
0
votes
1answer
48 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
votes
1answer
49 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, ...
0
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0answers
85 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
votes
3answers
176 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. ...
0
votes
1answer
81 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 ...
0
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0answers
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 ...
0
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3answers
201 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. ( ...
0
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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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votes
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 ...
0
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1answer
64 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: ...
1
vote
2answers
194 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
votes
2answers
68 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.
2
votes
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. ...
1
vote
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
votes
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 ...