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

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coupled inductor in series

I'm planning on using a dual inductor in series mode to increase the inductance. I realize that the total inductance will be L1+L2+2M where M is the mutual inductance (when the polarity is connected ...
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45 views

Value of inductor

I need to wind an inductor with a value between 47uH - 200uH. I have a 10 mm (in diameter) ferrite core from an RF choke used in an old radio (probably lossy ferrite). The core is 3 cm long (I also ...
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4answers
522 views

Shorts in parallel - out of curiosity

Normally a current would take a simpler route, hence why a resistor in parallel with a short gets no share in current. Again two equal resistors in parallel get equal share in current. These ...
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72 views

Where to salvage inductors?

I need a toroidal inductor for my ZVS flyback driver. The value should be between 47uH to 200uH. It should be able to handle 6A. Where can I salvage them from?
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41 views

Complex power for RL and RC [closed]

Is this true? Or is this true? Ø and Q are from this equation: When current is lagging the voltage, is this leading or lagging power?
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3answers
95 views

Inverse Laplace Transform of RLC Circuit

The voltage across the power source equals the summed voltage across the resistor, capacitor, and inductor at any time (t). This is shown in the equation below: ...
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1answer
50 views

Axial inductor between the plates of a cylindrical capacitor

What happens if you put an axial inductor between the plates of a cylindrical capacitor (capacitor supplied with AC signal)?
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60 views

Inductor specifications for AM circuits

I am working with the book "Build Your Own Transistor Radios" by Ronald Quan in which he has a lot of AM projects. I am having a hard time figuring out what I need to buy from his specifications. For ...
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2answers
84 views

what will be the resistor to find the time constant?

simulate this circuit – Schematic created using CircuitLab What resistance should I use to find the time constant? is it 30 ohm or 1130 ohm? what if the capacitor is an inductor will I be ...
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1answer
65 views

How to find the complex power for a current source?

The relevant circuit is shown below, We should first find the complex power delivered by the independent source. I derived it but my answer was different than the answer given. So, I am wondering ...
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3answers
78 views

Properties of inductors with a magnetic core

If I take an Iron core,for example a simple nail, and coil wire around it, I create an inductor. Now if I strongly magnetize the iron core, will any properties of the inductor change?
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40 views

impact of inductor and capacitor at resonance [closed]

It is said that inductor and capacitor cancle each others effect during resonance bt do they still have any effect on the circuit??
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2answers
91 views

Would using litz wire for an inductor change the inductance compared to regular wire?

Litz wire is multistranded wire where each strand is insulated from the others along the wire's length, but they are connected together on each end. This is useful primarily to reduce the skin ...
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1answer
105 views

How to create this copper coil to withstand much heat

Hopefully this is not as off topic as it might seem. Some background information: I've created the coil below to use as an induction heater from regular 230Vac household insulated wire. The coil is ...
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1answer
129 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
113 views

Inductors Vs. Capacitor [closed]

What are the advantages/disadvantages of using a capacitor in filter circuits instead of other passive elements?
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1answer
55 views

What are important inductor parameters to specify for use in a matching circuit?

The title could be more clear: I have a matching circuit but the datasheet is restricted. I'll post a reference matching network as a schematic here. simulate this circuit – Schematic ...
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1answer
78 views

How do I calculate the hysteresis losses of a straight line inductor?

In using a particular type of conductor for an antenna in AC frequencies between 3MHz and 30MHz (HF), it was suggested that magnetic hysteresis losses may be significant if the permeability of the ...
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1answer
65 views

Am I right in analyzing this simple RL circuit?

I'm given this circuit which is in steady state: At some point the switch closes. What happens to the voltage across the inductor and the current through it? Well, the way I see it is that if the ...
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2answers
103 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 :( ...
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1answer
134 views

Inductor with Ground Shield

I am having some problem with one of the boards I am working on, the noise from the inductor is coupling to an analog circuit and I was wondering if there are inductors that has a ground shield. I ...
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1answer
258 views

50/60Hz inverter output inductor design

Given a SMPS PWM inverter (for example an UPS) supplying voltage/current at 50/60Hz, how do you design an output inductor? I don't mean how you compute its value in uH/mH nor its current rating in A. ...
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2answers
83 views

How does a capacitive receiver work for a fox and hound set?

I have been scouring the internet trying to find this answer, I've found hints and ideas, but nothing concrete, like an actual theory of operation. I'm making a fox and hound wire tracer for my final ...
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2answers
63 views

Initial current in an RL circuit

I would like to confirm that I am going about this exercise the right way. "After a long time of being open the switch closes at t=0. Find $_L(s) and i_L(t)." (See picture below) Do I need to take ...
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1answer
393 views

How to use Boost Step-Up Converter MC34063

I am trying to use a MC34063 switching regulator to step-up 5v to 12v. I have wired it up as shown below, I think its the same as the datasheet. But I only get ~4 volts out. I know the capacitors ...
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1answer
76 views

low-cost idea for Identifying passive tags by inductive coupling/pulses

Hi electronics experts, I want to build a circuit that can identify few (4-10) tags wirelessly by proximity. No need for multiple simultaneous detection. I don't need any memory on the tags - just a ...
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3answers
336 views

What is the difference between a transformer and a coupled inductor?

Transformers and coupled inductors seem very similar. Is there a difference in construction? Or only in use? This question asks something similar, but the answers don't address my question: Coupled ...
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1answer
89 views

Use CT current sensor to measure AC current of a single device

So I recently bought 3 current transformers with the goal to measure the current of 3 washing machines. All I want to measure is if the machines are running or not so accuracy isn't really a concern. ...
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1answer
45 views

Inductor using thick film technology

Can we make inductor in thick film technology to use as in hybrid micro circuits? If so what is the wattage limitation?
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1answer
108 views

Magnetic coupling of inductive loads

I have been working a little bit on a hobby project of mine involving inductive power distribution. I have never done anything like this before and before I hook things together I would like to avoid ...
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1answer
82 views

Initial Conditions and current for an RLC circuit

It is required to find \$i_L\$ and \$v_c\$. It is quite easy to find \$v_c\$ from \$i_L\$ using simple integration. So, for now finding \$i_L\$ will be the concern of the question. Prior to closing ...
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1answer
52 views

Simulation of tuned circuit with initial inductor current gives flat zero

I'm playing with ngspice, and wondered if I could get a signal out of a simple RLC circuit using an inductor with initial current. There are no power or current sources. The results aren't what I ...
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1answer
111 views

Linear Transformer and Ideal Transformer: electric circuit question

The question is to determine k in so that no current flows in Zx. I literally have no clue how to start. If there is no current in \$Z_x\$ that would make it an open circuit, so for it to be ...
2
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3answers
205 views

Steady State RLC Circuit With Dependent Current source

I'm trying to figure out the reason why in the following circuit, at steady state, the current ix is zero. My best guess is that because there is a parallel branch which by KCL should equal 100ix and ...
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1answer
87 views

Ideal inductor in series with a resistor:

The question is to find the thevenin equivalent circuit across a and b. The inductors are ideal transformers. I stretched the inductors 180 degrees to make the circuit easier to analyze. From ...
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1answer
97 views

Basic electric Circuit with inductors

Its required to find \$v_o\$. The question should be easy but I am not getting the same answer as offered by the textbook which is 2cos(400t-53). I am getting 5cos(400t-53). I tried doing in two ...
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2answers
61 views

Question about a short-circuited inductor

If an inductor is ideal then it has no resistance, but only an inductance, how does the short-circuit affect the inductor? Why would the voltage across it be zero? I know that the 6H by mutual ...
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0answers
64 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 ...
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1answer
68 views

Replace unknown inductor [closed]

I have a PCB board from my washing machine which has an faulty inductor (marked as L4) on it. This inductor is in all probability used to limit the current on the Vdd of a series of ICs. Now its a ...
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1answer
41 views

Wire wound inductors naming

I see some SMT wire wound inductors are named like 3R3 or 4R5, much like a resistor, why so? I expected them to be like 4H5.
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180 views

Maximum limit on the Buck converter inductance value

I found the minimum inductor required for a buck converter using the following formula - $$L_1 = \frac{V_{in\,max} - V_{out}}{I_o \times K_{ind}} \times \frac{V_{out}}{V_{in\,max} \times ...
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3answers
85 views

Power factor meaning on induced motor

Let say A 440-V 60Hz three-phase star-connected four-pole induction motor developed 10 hp at 1745. The input power is 10kw at 0.85 lagging power factor. the no load input power is 0.6kw My ...
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1answer
185 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 ...
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2answers
207 views

Equivalent inductance of this gyrator

According to this link, the following schematic is equivalent to an inductance R1*R2*C placed between input and ground. Under which conditions is this true? As a guideline, we assume Vcc=9V. See this ...
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2answers
117 views

Inductors in parallel won't share current well

I have a question about putting two power inductors in parallel. It seems like they won’t share the current very well. The reason I say this is that inductors lose inductance as the current ...
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1answer
70 views

voltage across the inductor

this is question about voltage induced in a inductance, I know, rate of chage of current induces emf in the inductor. direction of the emf induced will be oppsite to the change that is causing it. ...
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1answer
402 views

How does an inductor generate back emf equal to a source driving it?

I have a question about the way inductors fundamentally work. How can an inductor be modeled as accurately as possible? I tried to approach this problem from the basics of electromagnetic fields, but ...
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1answer
271 views

How to produce a simple beep/sound without using piezo-buzzer

I am designing a fairly simple board where I need to sound a simple chirp/beep every couple of minutes, however, layout space is extremely limited. Therefore, a full-blown piezo buzzer is a no-go; ...
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1answer
191 views

What are these components?

I have an old mobile phone circuit board. I have several questions of components on this board. look the board: What are the components shown with red squares? are they filters(I think, I'm not ...
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4answers
315 views

Fundamentally knowing when to use capacitors / inductors [duplicate]

I've always stumbled when looking at even simple circuits that use capacitors or inductors and trying to work out why it is there, without using "past experience". What I mean is, if we need to limit ...