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

learn more… | top users | synonyms

1
vote
1answer
34 views

Stray Capacitance in my load waveform?

I have just taken this trace of my Loadwave form for PWM controlled halogen dimmer. I was wondering if anyone could identify the cause of the transients below or above zero volts for each polarity. ...
1
vote
1answer
28 views

Size of inductors in passive filters

I was reading about why we need active filters even when we have passive filters with us. I got to know that one of the main reasons for doing so, is that at lower frequencies the size of the inductor ...
1
vote
1answer
31 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) ...
4
votes
2answers
350 views

Why do we rectify then invert current in induction heaters?

I was trying to build a simple zone refining prototype, so I thought of How to simplifying induction heater for zone refining? I throughly read What does a beginner need to know to build an inductive ...
1
vote
2answers
26 views

Calculate rotor slip without knowing synchronous speed

I am given the rated values of a squirrel cage induction motor: A 300hp, 2300V, 3‐phase, 60Hz squirrel‐cage induction motor turns at a full‐load speed of 590r/min. What is the approximate value ...
-1
votes
0answers
56 views

I'm making a speaker with variable: Resistors, Capacitors, and Inductors. What do I need? [closed]

I'm a total Noob at Circuits, i have no education whatsoever. But, I want to build a speaker system with the abilities of changing volume and frequency ranges. I've done a little research on the ...
2
votes
4answers
167 views

How does inductor store energy?

I know that the capacitors store energy by accumulating charges at their plates, similarly people say that inductor stores energy in magnetic field. I cannot understand this statement. I can't figure ...
2
votes
1answer
38 views

Buck Converter Multiple inductors

I'm looking at a height constrained application, that's making it difficult to find the power inductors I need. What's wrong with say using 4 inductors in parallel to get more current? I know the ...
3
votes
4answers
101 views

Why would anyone use an inductor on a mux?

I read a schematic where it has a Z80 CPU tied to a 78LS138. The CPU's WR line is tied to ...
1
vote
1answer
56 views

Newbie RLC Question

Hoping someone can help. I have been studying RLC series circuits. The first set of questions gave the value of resistor, inductor and capacitor, which were calculated as follows: To calculate ...
0
votes
1answer
23 views

How is quality factor affected when combining inductors?

Lets say I have an inductor, L1 = 22 nH, with a quality factor (Q) of 50. I need an inductor of 44 nH, so I put two L1s in series. Will the Q of "the combined inductor" be 50? What if I want half ...
0
votes
2answers
35 views

Does gauge size of a signal wire has an effect to its susseptability to electromagnetic interference?

Let's say you have the option to use a lower gauge wire size (i.e. thicker wire) for a signal wire that happens to be run along power wires. Will it pick up more electromagnetic interference than ...
0
votes
1answer
46 views

Hi, in following circuit how do i calculate value of inductors L1, L2, L3, L4. (Design equations for inductors)

What will be the design equation to calculate values of inductors L1, L2, L3, L4.
2
votes
1answer
81 views

How to correctly use a LC meter/bridge

I have a LC meter at hand that I'd like to use it to measure the inductance (dominated by L1) of a circuit branch like this : simulate this circuit – Schematic created using CircuitLab ...
0
votes
1answer
57 views

What is the purpose of an inductor on an incoming AC line?

I am trying to build the following schematic. It is a AC/DC converter from Cui link I do not understand the function of L2. What is its purpose? I am having a ...
1
vote
1answer
92 views

Can I measure inductor current by adding a secondary winding?

I have a buck converter and I want to add a current loop to it. I don't want to use a hall-effect sensor or something expensive like that. I think it is not practical to use a sensing resistor since ...
-1
votes
1answer
105 views

Why inductors can not be integrated into IC? [duplicate]

If passive components like resistor and capacitor can be integrated into an IC, why not inductor?
0
votes
1answer
60 views

Wind high impedance transformer at home

Suppose I need to make transformer at home, but I am unable to wind 100k turns obviously, then can I just connect a resistor in series with a winding to achieve desired impedance? Will it have serious ...
1
vote
0answers
116 views

Why output current shoots up by 10x

Here is my hand cranked generator for charging a high voltage capacitor. How the system is designed to work is shown in the following image: It is designed to charge the 10 mF capacitor to upto 50 V ...
0
votes
1answer
70 views

How to design mutual inductor in proteus for wireless charging?

While designing the wireless charger, i've designed the circuitry in proteus. And it begins with the use of the dc voltage, then the oscillator and finally the transmitter circuitry and the receiver ...
1
vote
2answers
111 views

Reduction of DC motor noise

I am designing a circuit with a DC motor (http://www.jaycar.com.au/products_uploaded/YG2732.pdf) and some other stuff including a MCU and a LASER, all driven from a single 12V source and am concerned ...
1
vote
0answers
51 views

Which current ripple equation should I use? (Boost converter)

I am designing a boost converter for a microgrid as an university project. It is supposed to interface a 2.4kW 120V solar array (using MPPT) with a 380V DC bus. There will be other sources and loads ...
2
votes
3answers
137 views

Current through Inductor Problem

I am working on my Circuits Analysis class and I came across an interesting problem. I will put it below along with my work and then explain the problem. The current through the \$L=100\,mH\$ ...
0
votes
2answers
85 views

Calculating inductor voltage in a second order linear circuit

I was trying to solve the following second order linear circuit: I managed to calculate all parameters but one: the Voltage of the Inductor at t=0, that is necessary to define the B parameter of ...
0
votes
1answer
52 views

4 pin inductor for buck convertor

I am designing a buck converter. I have found an inductor to use for it but it consists of 4 pins. Will I not need only 2 pins? The inductor is: WURTH ELEKTRONIK 7446622002 CHOKE, COMMON MODE, ...
3
votes
2answers
345 views

Missed ordering 10uH inductors for ICs, do I need them?

Well dumb me apparently forgot to order these 10μH inductors. I'm assuming the L and the C and the R are used for band-pass-filtering/stabilizing the input voltages. I really don't want to make an ...
1
vote
1answer
62 views

external power treatment in the powered board

I'm working with an audio board (company project) that is powered by a external 9V power supply. Actually an ordinary AC adapter, like this one: http://www.sweetwater.com/store/detail/MAud9v500. The ...
0
votes
0answers
74 views

How does this single-ended to balanced circuit work?

This comes from the sparkfun jamboree bluetooth audio board schematics (https://cdn.sparkfun.com/datasheets/Wireless/Bluetooth/Purpletooth_Jamboree1.pdf) How exactly does this work? With S7 in ...
0
votes
1answer
71 views

How do I pick an inductor(s?) for an LC filter on a power rail?

I'm using a TI SN6501 transformer driver to provide an isolated power supply for a project I'm working on. However, it is imperative that the output power rail be as clean and noiseless as possible, ...
0
votes
1answer
61 views

step response of a circuit having an inductor loop

What is the step response of \$I_1(t)\$ in the following circuit? (I mean if we apply step as input I what will be the I1? I simply used Laplace transform and calculated the step response, but it was ...
6
votes
1answer
467 views

Boost SMPS getting very hot. Why?

I tried to experiment with boost SMPS with multiple supply rails and I almost burned myself when touching parts when running. Here is the circuit and the part getting hot: simulate this ...
4
votes
2answers
146 views

Is there a difference between a choke, a reactor, and an inductor?

I've seen all three of these terms used interchangeably. But once when I did so, I was told I was using one of the terms incorrectly. Are these terms, in fact, equivalent? Or are there differences ...
0
votes
3answers
95 views

How to measure the bonding wire inductance in lab by myself?

Very curious about the IC design. Everytime when we get our chips , we always need to bond wire the chip to connect the PCB. Even though the factory always claims that the bonding wire is 0.8nH/mm for ...
5
votes
4answers
252 views

Winding my own inductor-resistance

I am building a boost converter 12VDC-24VDC with output current of \$I_{out}=250\:\mathrm{mA}\$ and input current of around \$I_{in}=600\:\mathrm{mA}\$ and need to design an inductor for it. I've ...
3
votes
2answers
173 views

Why does the current rise and fall linearly in a DC-DC converter?

I don't understand why the current in a DC-DC converter rises and falls in a triangular waveform pattern. I think it has something to do with the energy in the magnetic field, but I don't know any ...
1
vote
4answers
113 views

Alternative ways to catch an inductor's flyback current

This guy had a bit of problem installing the flyback diode to his relays due to physical obstruction. Now if that is really an issue will this be a good alternative way, for perfboards and ...
2
votes
1answer
318 views

This is an inductor symbol, right?

This is from the PCB in a microwave oven. On the right side, there are two symbols with the labels DU and OMIF. They look like inductors. Is that correct? sidenote: this is found underneath a relay, ...
2
votes
3answers
221 views

20AWG wire inductor and 8A, possible?

I have a inductor made up of ~5cm of 20AWG wire. Switching frequency of the inductor is 500kHz. And the duty cycle is somewhere between 10-30%. Maximum current through the inductor is 8A at around ...
1
vote
2answers
135 views

Estimate current through inductor in DC circuit with PWM control

I am designing a circuit to control an electromagnet (coil with iron core) through a N-channel MOSFET driven by a PWM signal. I can't figure out how to derive the relationship between the PWM duty ...
3
votes
2answers
267 views

How to calculate the Back-EMF energy on an Inductor?

The Back-EMF generated by an inductor in Volts is: \$V = -L\dfrac{di}{dt}\$ Where \$L\$ is the self-inductance and \$\dfrac{di}{dt}\$ the rate of current change. Now, let's say I want to store those ...
1
vote
2answers
96 views

Is an LR Phase Shift Oscillator possible?

All the phase shift oscillators I've seen use RC stages each of which produces a 60degree phase-shift. Is it possible to inductors instead of resistors? My understanding is that inductors also cause a ...
5
votes
2answers
726 views

What is this symbol on the schematic?

What is this element on the far right of schematic described as "270 OHM"? Is this some kind of inductor? What is its purpose in this device (this is a reference design of dc-dc power supply of sim900 ...
2
votes
1answer
93 views

Buck converter design problem/confusion

I have problem with designing buck converter. I have tried to design it by using instructions from this site: Buck converter And here are my parameters: V input - 72V max V output - 12 V ...
0
votes
0answers
38 views

Floating simulated inductor. Simple implementation?

I would like to build an analog delay line (basically many stages of LC filters). To get a long enough delay I need pretty big inductors, in the 500mH+ region and I need many of them (at least 16, ...
1
vote
1answer
171 views

Trying to understand this oscillator… there's no emitter grounding or bias

I dissected and drew up this oscillator circuit from a cassette machine the other night. It's purpose is for biasing the tape. I'm curious though as to how this oscillator functions since the base is ...
7
votes
2answers
153 views

Electrical behavior of holding magnets when you pull them apart

I'm going to buy a holding electromagnet and a strike plate to hold some things, and I want to design my circuit (arduino-controlled) not to fry like bacon. I'm aware that since a holding magnet is ...
1
vote
2answers
85 views

Can this gyrator handle high current and/or high voltage?

Since I first got introduce to the Antoniou Inductor while in university, I've always been amazed at it. I've never built or used one, but I am thinking about using it to simulate an inductor for a ...
0
votes
2answers
84 views

Electric current of inductor

I have a homework problem that was solved by our instructor: "Calculate the electric current of the inductor at \$t=0^+\$." He calculated \$1/30\$ but the answer sheet was says \$-1/30\$. Which ...
0
votes
1answer
318 views

Coil Winding Sense of Inductor/Transformers and Output Polarity

Given a solenoidal coil, if it is wound in one sense (say clockwise), would the output from it, in terms of polarity, be equivalent to another coil, wound in the opposite sense (counter-clockwise), ...
4
votes
3answers
302 views

When do I twist the wires going to transformer winding terminals, and why do I do it?

I sometimes see the wires of winding are twisted outside of the transformer (or inductor), as seen in the images below. What is the purpose of this? When should I twist winding wires and when ...