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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At what input frequency of an LCR meter should I measure the inductance of a solenoid valve?

I wanted to measure the inductance of a solenoid valve that I have: Airtec 2P025-08. I took it to the university's electronic valve. There was an LCR meter and I measured this values: @ 120hz : R = ...
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54 views

pros and cons of replacing a passive inductor by a gyrator

I am studying the construction of some touch sensors, and I need inductances of 10mH, I know I can easily do it, and also purchase them without much difficulty, however I know that it is possible to ...
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54 views

Induction loop for catching lightning?

Recent thunderstorm, and a big overhead cloud to cloud lightning flash. Coincident with it, sparks jumped from a metal chair in the house. Would it be possible to get a spark from a loop of cable ...
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44 views

With regard to proper EMC design, what does the term Incomplete Inductance mean and what is it's significance?

I presume it has to do with incomplete loops or loop inductance. Do I want to avoid Incomplete Inductance? If so, what are some best practices? EDIT Here's a link to an upcoming EMC seminar brochure ...
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48 views

Inductance of a relay coil

I'm using a magnetic latching dpdt relay from Teledyne company. The value of inductance for the coil in the relay is needed and not given in the data sheet. The part number of relay is 422d from ...
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81 views

Why is inductor completely canceling out current?

I used this calculator to determine that my hand-turned inductor has an inductance of approx. .5 uH. simulate this circuit – Schematic created using CircuitLab When I measure this ...
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98 views

Measuring the inductance of a coil?

I have a hand-wound coil I'm using in an LC Tank circuit. Using my multi-meter, I found out that the coil is drawing .6mA at 9v. Using Ohm's Law... $$R = V/I$$ $$R = 9/.0006$$ $$R = 15kΩ$$ Is there ...
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39 views

LC tank circuit feeding on op-amp, no oscillation?

Based on what I learned during this experiment I've built the following circuit using an op-amp configured as a buffer... simulate this circuit – Schematic created using CircuitLab The ...
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173 views

Measuring change in inductance

I have a coil whose inductance will be changing continuously. I would like build a circuit to monitor the change in inductance continuously. Can I just use a RCL circuit and give it a sine wave of f ...
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66 views

Is my Rigowksi Coil turns calculation correct and how to calculate the sensitivity?

First, I would like to show my calculation. Please correct me if I'm wrong. Suppose the maximum induced voltage in the coil is 250mV and the current to be measured is maximum 1000 A. So, the current ...
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51 views

Good ways to read a 16-bit code at very short distances (~0.5cm)

I'm looking at ways to read a 16-bit code over a very short distance, through an opaque material. The sensors might be quite close to each other (~10cm), and they'll need to read only the code that ...
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34 views

Help with basic inductor

I need some help with this basic inductor. If I have the current in that direction and those values of voltage and inductance, what is the value of $$\frac{di}{dt}$$ ? I know that: ...
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40 views

Parameters of a metal detector coil

I built metal detector called MiniPulse Plus (it is a kit. comes with calibration instructions but says nothing about the coil, except that it should be between 300-500uH). A circuit sends a pulse ...
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108 views

Transformer Inductance not taken into account?

When modelling an ideal transformer, why do we not consider the inductance of the primary and secondary windings of the transformer. Wouldn't this inductance affect the current pulled from the source? ...
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40 views

Inductor Core Loss: Volt-uS vs. Irms vs. Switcher Frequency

For DC to DC application, I see these charts often for inductors, but I don't understand what they actually mean. What does this chart mean, and how does it relate Volt-uS, Irms, & Freq? Edit: ...
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116 views

How does a transformer transmit power from the primary to the secondary?

I'm trying to get my head wrapped around transformer operation and in the process regretting the times I snoozed in my Electromagnetics class as a EE student back when I was a lad :) I'm looking for ...
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22 views

How to chose a right inductor for a matching circuit

I would like to chose an inductor to make a matching circuit. Operating frequency is 6.1 GHz. I am more concerned with self resonance frequency and Q of an inductor. An inductor with SRF > 7 GHz and ...
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90 views

Would an inductor and a wire in parallel have an equivalent inductance of 0?

Since the equation is \$\frac{L_1L_2}{L_1+L_2}\$ and one of the wires has an inductance of zero , would the \$L_{eq} = 0\$?
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45 views

Inductor for boost converter circuit

I'm using an AAT1217 for the boost converter in my circuit. The reference circuit I'm using is: The datasheet suggests several inductors: It suggests using these fairly large inductors, the ones ...
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73 views

Measure inductor coil's resistance using multimeter

simulate this circuit – Schematic created using CircuitLab Above is the set-up of my simple experiment to determine the inductance of an inductor. The voltage across resistor R (5 ohms) ...
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53 views

Self Inductance Of the Coil

Q. Lower the self inductance of a coil _. Options : more will be the weber-turns. more will be the emf induced. lesser the flux produced by it. smaller the delay in establishing steady current ...
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75 views

Effect of Iron Core in Inductor On Bulb

I want to know how does the brightness of the bulb change when a soft iron core is inserted in the shown inductor when the bulb is initially glowing. My textbook says that as we insert a soft iron ...
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58 views

Inductor Reactance

I have a few questions about the reactance of inductors at certain frequencies. I have been working on a project that involves flipping the field in a solenoid with an air core at ~10-20 kHz with a ...
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50 views

Calculating capacitance at resonance

Could someone help me please asap, New to this ! Thank you! working out for the first one , could someone confirm? first question has been confirmed thanks Second question confirmation? thanks
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96 views

Can pulsating DC be used for induction heating?

I want to make an induction heater work using a 12 v, 35 A-h battery(used in cars). I don't want to use an inverter. Will a pulsating DC input to the induction heater make it work?
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119 views

Is a flyback diode needed if there are only inductive components on the circuit (Ex. solenoids)

I'm using relays to drive a circuit of solenoids. Do I really need flyback diodes on the controlled circuit if there are only solenoids on it? The driving circuit is already protected by flybacks. ...
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122 views

What is the purpose of curved PCB traces? [duplicate]

I have seen traces like this enough times to begin wondering if there is a purpose and benefit. The only technical explanation I can come up with is that perhaps these curved traces increase the ...
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160 views

Resistance and Inductance of a ceiling fan motor needed to spec snubber

I'm looking to specify (well, suggest) a RC snubber network for someone over on diy.se who is having EMI problems with his ceiling fan knocking out his TV briefly on turn-off: ...
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2answers
305 views

Electrical noise on guitar pickups from computer. Due to radio interference, or inductive coupling?

When I point my guitar pickups towards my desktop computer from several feet (2 1/2 - 3) away, I can hear a lot of buzzing/clicking, depending on what the computer is doing (idling vs, say, playing ...
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191 views

Measuring inductance and ESR of a motor using LCR meter

I am building a circuit, where a MCU will drive an unipolar stepper motor through MOSFETs and constant current source (not included in the schematic). simulate this circuit – Schematic ...
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237 views

Reset Winding in Single Switch Forward Converter - How To Dissipate Leakage Inductance?

In a single switched forward converter, the core reset is done by a third winding with opposite dot polarity to the primary and secondary windings. This dissipates the magnetizing inductance but how ...
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112 views

Why does stepper motor not turn properly at different frequencies?

I have an 8 wire stepper motor and an unipolar motor driver. I wired the motor as unipolar connection. On motor 3.15V and 4.2A is written. My connection is above. When I connect V to 24V 14A source ...
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47 views

Value of omega from forced response V0

Based on figure. Maybe a simple question, but I'd like to know why that if forced response is zero, then $$\omega L = \frac{1}{\omega C}$$ where \$L\$ is the inductance and \$C\$ is the ...
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68 views

How does this inductive musical-keyboard function?

I've been looking to interface with a keyboard that I've removed from a non-functional system, specifically an Ensoniq EPS-16. As luck would have it, I managed to find schematics for the controller ...
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608 views

How does the plastic-tube inductor in this wireless transmitter work?

This single layer PCB (solder side shown here) is from an old fan remote: The inductor in the plastic tube is not connected physically to any components; however, the two loops of wire surrounding ...
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146 views

Can I make a step up transformer using these components?

I have a step down transformer that converts from 220 volt to 15 volt. I want to connect the secondary coil of this transformer to the output of 555 IC that produces ( 5 volt / 100 KHz ). Is there ...
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69 views

Current overlap in Inductive Smoothing?

I have the following circuit implemented in the lab : And the output was : Can anyone explain why the current overlaps here ? I can't make sense of this.
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494 views

Can a current be induced in an HDMI cable that runs parallel to a 120v AC cable for 15 feet?

I just went to go unplug an HDMI cable and got shocked from the end of it! The only possible causes of this that I can think of are that the receiving or sending end of the long (50ft) HDMI cable is ...
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1answer
150 views

Can I increase inductance using permanent magnet ?

I know that when I insert a ferromagnetic core inside an air-cored coil, the inductance increases. What if I inserted a permanent magnet with a cylindrical shape into an air-cored coil, does the ...
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76 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 ...
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234 views

How to measure coils without Inductance measuring device?

I have a multimeter that can measures Capacitance, Resistors, voltage and current. If I have a known coil and unknown coil. Can I measure the ratio between the inductance of the two coils ? Is it ...
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5answers
436 views

How can the infinite reactance of either primary or secondary in an ideal transformer draw current?

Assumption 1: An "ideal" transformer is said to have very large primary, secondary, and mutual reactance.. (self-inductance/mutual-inductance tending toward infinity), has a unity coupling coefficient ...
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2answers
1k 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
61 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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56 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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138 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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4answers
167 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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182 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 ...
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58 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\$. ...
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363 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? ...