Inductance is the property by which a change in current in a conductor induces a voltage both in the conductor itself and nearby inductors, the latter being the basis upon which transformers operate. Discrete inductors are also available that have many applications including filtering and energy ...

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113 views

How to make LC tank circuits oscillate continuously?

An LC tank circuit produces oscillations, when the capacitor is charged and connected to the inductor, but the oscillations decay gradually. How to make it continue, i.e. oscillate continuously? I ...
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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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0answers
73 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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2answers
34 views

Component selections for the ETA3406 DC/DC converter

I was browsing Seeed Studio's Open Parts Library and found the ETA3406, which is a 1.5 MHz 1.2 A Step-Down Converter. It's pretty cheap, and looks very useful for something I want to build, but the ...
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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
68 views

Do transmission lines induce electric or magnetic fields in towers?

Transmission lines have EM fields around them due to the high amount of current. Do these fields affect transmission towers (metal or otherwise)? If so, would it be possible to estimate the current ...
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2answers
66 views

Toroidal Transformer High Current Output

Can a 28-0-28 amplifier toroidal transformer like this be practically used as a high current supply at low voltages? I plan to put a couple of turns of 4 gauge wire through the centre. I want to use ...
0
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1answer
39 views

Mutual inductance of two loops

I got to measure inductance of circuit with two loops connected like this: simulate this circuit – Schematic created using CircuitLab simulate this circuit The box measures \$L\$. ...
0
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3answers
140 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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0answers
28 views

Permanent Magnet Synchronous Motor Direct & Quadrature Inductance

I've modeled the following motor (http://www.evo-electric.com/inc/files/AFM-140-Spec-Sheet-V1.1.pdf) assuming a direct & quadrature inductance of 0.2mH. However, I think I may have mistaken this ...
2
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3answers
94 views

LCR meter and iron core inductors

I am trying to wind some coils for a RF transmitter, so to get the values right, I though of using a LCR meter, but there is a problem with the measurements. If I use air core inductors the measured ...
-3
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3answers
74 views

When an inductance is connected to an AC supply, the current in the inductor is [closed]

When an inductance is connected to an AC supply, the current in the inductor is is in phase with the voltage Lags the voltage by 90 degrees. Leads the voltage by 90 degrees. Leads the voltage by 180 ...
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1answer
47 views

How do I place a long wire to make the EMI and inductance minimum?

I'm going to measure high current. After seeing that there is not a lot of low valued sensor resistors in the market and the available ones are very expensive, I decided to make my own current sensing ...
1
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3answers
176 views

How to identify mutual inductance?

I have two coils covered in a box and I don't know the physical arrangement of the two coils and mode of each winding in a magnetically couple DC circuit. How can I make an experiment to determine the ...
0
votes
2answers
65 views

Minimal pulse width to actuate a solenoid

I'm powering a solenoid from a battery, so I want to spend the minimum amount of power to get the job done. In this case the solenoid doesn't even have a return spring, so as soon as the armature has ...
1
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2answers
119 views

How to design an square wave Oscillator Circuit with 1-20 MHz range?

I need a circuit that will generate square waves in a range of 1 to 20MHz. The circuit also should be adjustable in a scale of 0.05MHz for each step. There is no need for adjustments during the ...
1
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2answers
147 views

RGB LED strip, powered by an ATX PSU and controlled by PWM, makes my speakers buzz with Arduino connected by USB

I've not much idea about electronics, but I managed to do some little projects in the past. Now I'd like to place some RGB LEDs in my desktop PC windowed case. For that, I bought a 5050 SMD strip with ...
2
votes
1answer
80 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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0answers
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
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 ...
3
votes
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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2answers
55 views

EMF due to inductance?

In a DC circuit, current starts to flow, and some time is needed for current to stabilize based on the time constant, there is EMF induced due to current changing over time. As soon as the current ...
1
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1answer
135 views

What could be used to send induced/coupled CAN-BUS signal

My problem I am experiencing is with the circuitry or IC combination to follow. I don't need a answer of what exact IC models I need, as that would be plain stupid. What I asked originally about the ...
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2answers
85 views

Use of inductors vs resistors

Why would we place an inductor in series with a lamp, rather than just a resistor? I'm sort of thinking it has something to do with being able to control voltage to the lamp, without effecting ...
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 ...
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0answers
46 views

Compensation of leakage reactance in high frequency transformer

I have a designed a toroidal high-frequency (12/350V, 800VA, 100kHz) transformer with a 50uH magnetization inductance. I measured the leakage inductance by resonating it with a 1uF capacitor. The ...
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1answer
101 views

Two-port network: find fundamental parameters

What is the easiest method to find the ABCD parameters? I tried replacing the middle part of the circuit (R2,L,C) with an equivalent impedance and then finding U2 depending on U1, but it is very ...
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6answers
184 views

Measuring small inductances

I'm working on a small hobby project - a small (230V wall plugged) coreless induction furnace. I generally know what I'm doing, chosen a topology, calculated inverter and coil parameters, desired ...
2
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2answers
95 views

Capacitance and Inductance properties of coaxial transmission lines

I'm interested to understand what affect the capacitance (between cable core and shielding) and the inductance have on a signal transmitting down a coaxial cable.
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0answers
61 views

How do I find a Capacitor's SRF from the limited information a supplier gives me?

I have a chip which requires two capacitors connecting the Vcc in and Vss. The two capacitors are a 15nf and 2.2uf. The spec says that the capacitors (at least the 15nf) must have an SRF of 32Mhz. ...
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3answers
395 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 ...
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1answer
66 views

Circuit with coupled inductors, need help with mesh equations

Are the mesh eqations in the image below correct? It gets a little tricky with the mutual inductance and my textbook gives no solution (American textbooks..). Click the image below for a larger view. ...
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42 views

How to understand voltage change between different phases of BLDC?

Actually, it is a question about an application note of BLDC from here. (on page 30 of that material) The question is about calculation of potential of M. What I learned from book is that the ...
3
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5answers
1k views

Why does a capacitor act like a short-circuit during a current impulse?

While trying to solve questions involving impulses and step functions, we are supposed to assume that an uncharged capacitor or an uncharged inductor acts as a short circuit and open-circuit ...
0
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1answer
48 views

Measuring self-capacitance of coils

Is there a simple way of measuring the self-capacitance of a coil? There are many estimates out there for self-capacitance based on number of turns and wire specs, but I'm wondering if I can do an ...
1
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2answers
82 views

What means coil inductance (h) for relays?

I'm looking at the data-sheet for a Single Coil Latched Relay. In there, i see the Coil Inductance (ref. value)(H) for Armature ON and OFF column. Specs: Rated ...
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4answers
119 views

Avoid inductive coupling on two near coils

I have two coils that are placed parallel from each other and separated by a mere 1.5cm, lets say A and B. The core of them is built using soft iron. Right now they are wired and built in the same ...
2
votes
2answers
126 views

How solder inductance affects RF circuits?

I'm assembling a VHF oscillator (90 MHz) and plan to reach UHF and SHF some day. Should I worry about solder inductance affecting an oscillator performance? If no, then when should I take it into ...
3
votes
1answer
166 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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2answers
148 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 :( ...
2
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2answers
219 views

How does a flyback diode work?

In a previous question I posted to the exchange I asked for some instructions on trying to variable speed control a motor. Someone suggested utilizing PWM from my Arduino to open and close a ...
4
votes
2answers
128 views

Crosstalk between secondary transformer windings

I have hand wound a transformer which has a 220v primary winding, two 25v secondaries and a 15v secondary: simulate this circuit – Schematic created using CircuitLab I have centre tapped ...
21
votes
2answers
4k views

Why don't typical digital multimeters measure inductance?

Even with predominantly digital circuits, I am using inductors much more often than I used to, generally because of all the buck or boost converters (a recent board I was involved in has 12 different ...
0
votes
0answers
66 views

What physical meaning does the dot convention for inductors/transformers have? [duplicate]

I never understood what the physical description of the dot on/below the inductor is. Does it have any significance in the organization/connection of the inductors? More specifically: Does how the ...
3
votes
2answers
90 views

Inductance in Power cords

Why doesn't the Inductance/Capacitance of Laptop charging wires and other appliances effect the performance of the devices/ power supplies? An inductance would be introduced if the wires are lying in ...
1
vote
1answer
58 views

Replace Current controlled Voltage Source Converter with Rectifier Diodes in ELC?

In this paper an Electronic Load Controller (ELC) for two (2) parallel generators is designed. I wish to omit the second generator and hope for simplification. Now two questions arose: (while I ...
0
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1answer
295 views

How do “Wire Wound Chip Inductors” work [closed]

I have a police scanner that has a couple of modules in it. One of these modules is marked 390G (Data Sheet) I can't see the other modules number but it looks identical. I know they are NOT the ...
3
votes
2answers
130 views

Telegrapher's equations

Something about the derivation of Telegrapher's equation is really bugging me. When deriving the Telgrapher's equations for a transmission line using a model as shown above, why do we only use a ...
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0answers
88 views

Equivalent Resistance

I'm working on the following homework problem. (Yes, this is homework. :p ) I'm supposed to find the current through L1 as a function of time. simulate this circuit – Schematic created ...
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0answers
91 views

Ground plane and magnets

I am making a wheel encoder out of a Hall Effect sensor with magnets in a concentric circle on the wheel. The Hall effect sensor is on a 2-layer 9x5mm pcb. I usually fill in the layers by drawing a ...