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Questions tagged [inductance]

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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Clarification on This Transformer Statement

Secondly, when the current starts to rise in the secondary wire, the magnetic field it generates is multiplied by the loop count. Obviously if we had lots of loops, a very small current will ...
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98 views

What does the mass term mean in the unit of inductance called the Henry?

Reduced to base SI units, one henry is the equivalent of one kilogram meter squared per second squared per ampere squared (kg m2 s-2 A-2). This does not look like the standard F = ma formula for a ...
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34 views

What's the value of this 5 band axial (should be) inductor? (I can't match the color scheme)

I can't find any clue with this inductor: Grey/Silver, Red, Black, Gold and White
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1answer
38 views

During the positive cycle of US AC MAINS Electricity is the secondary Voltage back EMF or in phase with the AC MAINS?

The Sine wave of AC Mains in the US starts at zero and increases to Vmax~169-Volts. in the beginning magnetic Flux Change is greatest as it is proportional to the slope of the AC Sine wave (which is ...
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1answer
62 views

Coil Area vs Core Area

Most inductance formulas seem to assume that the COIL cross sectional area is the same as the CORE cross sectional area. Many times, the coil is wound on a bobbin which slides over the core. In this ...
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29 views

Relay does not toggled to OFF sometimes

SRD-05VDC-SL-C relay does not turn to OFF sometimes. Loads - is light bulbs 220V E27. Ilyich light bulbs (tungsten filament) - work correctly. Problem in LED bulbs and fluorescent bulbs. 20% LED bulbs ...
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1answer
37 views

Inductance of planar (spiral) coil near solid copper surface

I'm working on a electromagnetic levitation system, consisting of a flat spiral (planar) inductor positioned above a solid copper surface. The planar coil is parallel to the copper surface. (Consider ...
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60 views

Scenarios where Inductor back EMF would result in damage of circuit or component

Let's say that there is a simple circuit with the following components (ignore values): LEFT: a simple power supply (assume DC) TOP: load (resistor) and inductor RIGHT: switch BOTTOM: load (resistor) ...
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1answer
52 views

DC motor H-Bridge - Snubber Cap

I have breadboarded a simple H-bridge shown further down using the mosfets linked below the schematics. The prototyping motor is a DC 12V 1A (NO LOAD) Motor Pictured below: Ultimately I ultimately ...
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1answer
44 views

How can I model and simulate a resonant inductive square spiral coil in MATLAB?

I was wondering if it was possible to model and simulate my WPT system in MATLAB to determine if my analytical calculations are correct. I want to model my system in MATLAB as I have seen on MathWorks ...
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606 views

If you have two identical but oppositely wound inductors does the inductance effectively cancel?

I was just curious if the effect inductance of a branch of a circuit would cancel if you put two identical but oppositely wound inductors in series. It's not something I have come across.But looking ...
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21 views

Rectifier Design RL load

I have a design problem with the circuit below, in order get the commutation angle u I need a value of Ls, assuming all other values are known in the formula below. As far as I know, Ls & u are ...
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61 views

Dot convention inductors in series: equation confusion

So I'm really confused with mutual inductors and dot convention. If your answer is going to be a link to any website I can assure you I read them all and that only left me more confused. So here are ...
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1answer
66 views

What are the considerations for designing a capacitor bank?

I am trying to understand capacitor banks and capacitor discharge, and how to work out what I need to generate a short pulsed current. If I would like to use capacitor discharge to produce a sudden ...
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1answer
65 views

Measuring current using ACS 712 with NI DAQ 9215

I am trying to measure current from Ignition coil(12V, 4.5A). i used arduino to measure current. And it worked good. And i connected the ACS712 signal pin to NI DAQ 9215. At zero current the output ...
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1answer
109 views

Why is my RF switch catching on fire?

The pictured circuit below works nicely as a electronically switchable-gain photodiode amplifier. Except for the small issue that as it is being plugged in, U2, a fast CMOS RF switch, has a ...
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1answer
53 views

Trying to understand inductance while driving a laser module

I have a simple circuit working where I drive a laser module with a mosfet(2SK4017Q), a 10K resistor (gate-source) applying 3.3V on the mosfet gate. Mosfet drain is connected to laser module GND, and ...
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1answer
100 views

Shortening a long antenna with a capacitance

In many circumstances it is not possible to make a dipole antenna that has the optimum length of \$\lambda/2\$ (or monopole with ground plane of length \$\lambda/4\$). Car antennas are for example ...
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2answers
78 views

Modeling a long single wire in a circuit?

I'm currently trying to make a model (equivalent circuit) of a long single wire with a resistor and inductor in series. Is this a proper way to do it? What I have done: Calculating the resistance ...
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2answers
110 views

How can I make a model of a single wire CAN bus cable?

I'm currently working on a project of analyzing the latency of a CAN bus network with transceivers and without transceivers. The latency parameter here will be analyzed with the effect of bus line ...
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0answers
180 views

ignition timing light trigger current

I've built an ignition timing light, following: http://citroen.tramontana.co.hu/en/ignition/stroboscopic-timing-light here the original schematic: I've changed some components: Instead of the ...
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1answer
49 views

Confusing phasor representation

Why capacitive impedance has the magnitude \$Z_{c} = \frac{-j}{\omega C}\$ but in the phasor diagram, we represent it as a vector pointing in the upward direction?. Same is with the case of an ...
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1answer
189 views

Current limiting ballast for a transformer

So, guys, I hope you can explain to me how to calculate the necessary parameters for a ballast to limit the current on the primary side of a high voltage transformer.It is for a tesla coil project. To ...
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1answer
40 views

Emulate the wire part for inductive loop sensor

Probably a use case example would show what I am trying to do: For timing speed of service, inductive loop detection (such as used on traffic light vehicle detection) is used to track cars through a ...
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1answer
58 views

common mode choke and derating vs current

I have a CMC that has is rated at about 1kR at 100Mhz at 3A However my circuit uses only 1A. Do I need to derate my inductance since there is less current flowing through it ?
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1answer
118 views

Circuit operation and component substitution questions for stroboscopic timing light

I'm trying to make a piece of circuitry, for a tool used to set the ignition timing of my old car. I've found the schematic and description here: http://citroen.tramontana.co.hu/en/ignition/...
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1answer
44 views

Inductive Charging 2 layer coil transfer to 1 layer receiver. Any issues?

I am looking to incorporate a inductive charging mechanism into a project I’m working on. On the receiving side I only have room for a single layer coil design. For my transfer side I have more ...
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1answer
64 views

Do not understand why current flows in undamped oscillator circuit, and getting troubles in practice

I want to make my own antenna, so I started to make a generator. I found scheme below (only without a K key in the bottom) in internet, and it seems to be exactly what I was looking for. There PNP ...
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1answer
60 views

What is rms power generated in an LC circuit? [closed]

LC CIRCUIT without ac supply. What is rms power generated or is it generated?
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0answers
38 views

Alternate formulation for the Neumann formula

I'm currently learning about the Neumann formula for the calculation of the mutual inductance between thin current filaments. However, for future purposes I want to find an alternative formulation of ...
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1answer
35 views

Why is the parasitic inductance placed in series with the resistance in the treatment of a real resistance?

As seen in the following image, the parasitic inductance is placed in series with the real resistance. I do not understand that it is the reason for this decision, whether by convention or there is a ...
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0answers
50 views

Value of Green as Multiplier for an Inductor Color code

I was going through the Internet searching for the Color code table for an Inductor. The more or less same table which I got is : I have got an inductor : So I cannot find out the Value of this ...
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1answer
70 views

More phase inductance in stepper motor

The selected stepper motor not enough to make required torque. So, I think its better to replace the stepper with higher torque. But, new stepper motor has 2.8mH phase inductance,Old one has 1.2mH. ...
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3answers
116 views

A question about inductive kick and the current voltage equation

In the book The Art of Electronics the author writes the following when trying to explain the inductive kick: And then he mentions when the switch is opened abruptly, the inductor tries to keep ...
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1answer
45 views

Confusion about inductors in series vs. combined

I suddenly was getting confused while reading about inductors. The formula for inductance I was using was the one like in the answer to this question. However, I have also read that the inductance ...
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1answer
58 views

Moving a magnet through coils wound in the opposite direction

Suppose I want to harvest kinetic energy by moving a magnet back and forth through a coil assembly. Faraday flashlights work by this principle, but to my knowledge those usually only have one coil. ...
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1answer
47 views

Can I estimate the leakage inductance of a power transformer taken from a catalogue?

I'm using PLECS to simulate an HVDC system and I've been using two ideal transformers (Y/Y & Y/D) in order to get a 12-pulse rectification. However, now I want to consider real parameters. PLECS ...
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2answers
116 views

Transmission Line Inductance

I went for an interview in BARC India for scientist position. They asked me to draw short transmission line. Then they started asking What does inductance represent? I said leakage while ...
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1answer
73 views

Correct formula for primary inductance

In just about every design guide I saw, the formula for primary inductance of flyback is: However in "SMPS Design" by Pressman/Billings the equation for CCM is: To bring second equation to the first ...
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4answers
993 views

Ground plane has low impedance or inductance? This causes no ground bounce?

The ground bounce is effect that ground rises due to inductance in the ground lead. https://www.eetimes.com/document.asp?doc_id=1255019 It is said that ground plane has low impedance, for that ...
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2answers
69 views

Question about Inductor

When an inductor is connected with a voltage source we get equal and opposite voltage on inductor against the source voltage. That equal and opposite voltage gradually decreases with time which allows ...
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2answers
386 views

How to check ferrite beads?

I faced with a problem of checking ferrite bead with parameters: The measurements for two reels of this component have difference in Resistance and inductance: Reel 1: Resistance: 170 mOhm, ...
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1answer
312 views

Understand simple FM transmitter, inductance, resonance

I learn electronic , I try to understand this project, simplest FM transmitter : The project is describe here : https://makezine.com/projects/super-simple-fm-transmitter/ The inductance of L1 (Strip ...
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25 views

What measures are taken to control inductance in switching stations?

I was thinking about the effect of changing loads on the power grid and I'm curious about the effects of inductance, how much inductance there is, and how to prevent it from causing voltage changes at ...
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0answers
198 views

Adding a ferrite bead to source of mosfet (smps)

We are designing a SMPS (ultra low noise) based on TI schematics http://www.ti.com/lit/df/tidrgc2/tidrgc2.pdf (5V, 15W quasi resonant) In order to reduce EMI (we have some ringing across Mosfet when ...
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1answer
97 views

Is there an inductor type that has the best inductance per unit volume?

Inductors come in many types e.g. cylindrical (single and multi layer), spiral (single layer and stacked), toroidal (single and multi layer), and probably others. For an air core inductor, assuming ...
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2answers
1k views

Why would you bypass a zener diode in the flyback protection of a relay coil? [duplicate]

SparkFun sells a relay control kit that you solder together. On the back of the circuit board there is a pair of metal contacts that are labeled "bridge for zener bypass". I assume you put a small ...
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1answer
53 views

Phasor representation

How did we separated/broke down this phasor expression?
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0answers
128 views

Is this stackable low RPM generator design viable?

I'm trying to invent viable handcrank energy generator for charging phones and similar low-power appliances. I want to avoid gears altogether in the design, because they are hard to manufacture at ...
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1answer
107 views

Role of “a current-limiting low-inductance resistor”?

While reading some experimental setup of a paper, I've came across with a statement saying, "Since a DC power supply is not capable of finely regulating the discharge current at very low currents( in ...