Questions tagged [inductor]

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

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25 views

How to create optimal solenoid actuator

I would like to create a solenoid like this one: It should be powered by 5V and of course I want it to take as little current as possible. I know it will probably still take a current of around 0.75, ...
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53 views

Amplifying voltage from an inductor

I have a primary inductor connected to a voltage source with frequencies varying from 100kHz to 15MHz. This primary inductor induces a voltage across a secondary inductor via coupling and I want to ...
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51 views

How does an LC network enable a shoot through state for an inverter

I was researching about inverters when I came across the Z source inverter. The Z source inverter is unique in a sense that it enables a shoot-through or a short circuit condition by closing any two ...
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24 views

Finding effective mutual inductance between a parallel inductors and a separate inductor

The effective inductance of two parallel coupled inductors can be calculated as \$ L_{eff} =\frac{ L_{1}L_{2} - M_{12}^2}{L_{1} + L_{2} - 2M_{12}} \$ where \$L_{eff}\$ is the effective inductance ...
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90 views

How often are inductors used in electronics

I am a relative beginner at using electronics, and am tight on money for my first load of electronics that I am going to buy. I was wondering if I should get some inductors now or wait for a bit ...
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50 views

Find voltage across inductor in RL circuit

I have this circuit in wich I try to find the voltage across the inductor (VL) at t = 0+ and the switch OPENS at t = 0 simulate this circuit – Schematic created using CircuitLab Here are my ...
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45 views

Permeability Discrepancy of an Inductor

Background: I bought a material 77 ferrite rod for a homemade inductor. The core was 0.5" in diameter and 7.5" long with a claimed initial permeability of 2000. When I recieved it, I tested it out ...
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22 views

Volt-Sec-balance and Capacitor-Charge-balance

I have a problem to get to an conclusion with the VS- or CC-balance. I know that the voltage over an inductor in an switched topology behaves in an stationary state like this: So the voltage-average ...
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30 views

Query on writing KVL equation for an RL circuit

Say I have the inductor in the following circuit with certain current already in the circuit flowing in the specified direction: simulate this circuit – Schematic created using CircuitLab If I ...
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89 views

Why use an inductor as a fuse?

I opened a small "wall-wart" power supply that had failed, and discovered the culprit to be a low-value (100µH) standard (axial, green) inductor. This inductor had a visible crack along it, as if it ...
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43 views

Why does a circuit with only reactive components have infinite Q factor?

So I came across the statement in my textbook. So I have been trying to understand why this is the case, however I just have not been able to understand
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1answer
88 views

Making an Inductor with Proper Inductance

Background I am planning to build a 0.0625 mH inductor, which will be sent about 15 kV max (10 uS pulses, 10 per second). The inductor will be made of 14 AWG copper wire in a tub of mineral oil. The ...
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59 views

2 band inductor value?

An old circuit board I have (that is very old) has these inductors on it. I can't find any mention online of a 2-band color code. What value would these inductors be? I thought maybe one of the ...
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34 views

Deriving Coupling Coefficient based on Parallel and Series Inductance (of coupled inductor)

Problem statement I was wondering whether it's possible to use a coupled inductor (e.g. this) as a signal transformer. However, these coupled inductors typically have a tradeoff between the ability ...
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50 views

Full wave rectifier with inductor filter

The capacitor-only bridge rectifier can't remove the ripple under heavy load and for a linear lab power supply I need to have an output without any ripple under load. after simulating the bridge ...
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16 views

Relay for rollershutter motor

A few years ago, I build a controller for our garden door rollershutters (2x 2m wide), 230VAC 2xL-N controlled. In some initial tests, the inductive load killed the cheap mechanical relays found on ...
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1answer
68 views

Substituting an inductor - cannot find any pieces containing inductance needed

I am a beginner electronics hobbyist trying to follow an old schematic / instructions to build a theremin. I have all of the pieces except one. This piece (Toko 154ANS-T1019Z) calls for a "68 µH, hi-...
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1answer
46 views

Inductor coils, core, and a gap between

I am speaking, here, not in the more usual sense of a gap in the continuity of the core material. I mean, in reference to a rod of core material, that the outside diameter of the rod is sufficiently ...
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37 views

Why is lenz law not applied in this crcuit analysis

So in this circuit, initially the current and voltage is 0. At t = 0 the voltage snaps to V. Now my analysis is: According to Lenz Law the voltage developed will ...
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1answer
86 views

Back EMF in an inductor with an AC supply

If a pure inductor is supplied with an AC voltage we will always have AC current and time changing electric field in the circuit. That always changing electric field will cause changing magnetic field ...
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1answer
41 views

High frequency filter circuit design

I am a trying to design a design an Electrosurgical interference suppression (ESIS) protection layer to filter out high frequency noise caused by Electrosurgical equipment during surgery. I am using ...
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3answers
54 views

How to choose the appropiate analog power supply filter inductor

I'm currently studying designs for a pulse oximeter for use with Arduino, I have seen two Schematic designs form the same company, https://www.protocentral.com/sensors/1113-protocentral-afe4490-pulse-...
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1answer
48 views

How does adding a capacitor change the frequency response of this inductive LPF?

I know that a simple circuit like this in an ideal case will have a frequency response of a single pole LPF, where the cutoff frequency is given by: cutoffFreq = 1/(twoPi*L*2R) This is reviewed here....
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85 views

Is Inductor peak current same as the Inductor Inrush current

I am using a DC-DC converter which is having an inductor rating of 68uH and 2.05A. Output Voltage of dc-dc is 23V and output current max is 300mA Schematic : I am using a current probe and ...
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1answer
53 views

Inductor Design - How do I know what value of Bmax and Current Density to choose?

In order to decide what type of core I need, I need to calculate the Area Product Ap which is given as: $$A_p \simeq \frac{LI^2}{JK_uB_{max}} $$ Where I is the current, L is the inductance, J is the ...
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Tesla Coil not working

I made a simple miniature Tesla Coil following a youtube tutorial (https://youtu.be/AehL3BodduE) As you can see in the photos, I 3-D printed a PVC pipe like piece and wound two copper wires one over ...
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47 views

HX711 : Inductor on supply line and feedback

I'm re-implementing the great HX711 breakout board from Sparkfun (schematics : https://cdn.sparkfun.com/assets/f/5/5/b/c/SparkFun_HX711_Load_Cell.pdf). I'm trying to understand the exact role of the ...
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1answer
68 views

Placing multiple inductors (buck) close to each other on PCB

I have three buck converters on my PCB. 12V to 0.82V @ 25A -FP1308-R21-R, Fsw = 650 kHz, TPS548D21 12V to 1V @ 8A - IHLP2525CZERR47M01, Fsw = 1 MHz, TPS548A20 12V to 5V @ 3A - Inductor is XAL5030-...
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2answers
189 views

If induced voltage (back-emf) is equal and opposite to applied voltage, what drives the current?

Suppose we have a circuit with a voltage source, a switch open and an inductor all in series. If we close the switch, the potential difference of the voltage source is instantaneously applied to the ...
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118 views

How do I really turn 3.7volts to 5 volts (simple explanation, please) [closed]

Look I understand a couple of things in electronics but I need clarity with this one thing. See for power banks to produce 5 V from 3.7 V, how exactly is an inductor used? I have a 5 V regular and I ...
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26 views

How to identify a circuit component (bipole) knowing the voltage and current?

I know a bipole was passed by a current of \$i(t)=5cos(6t)[A]\$ and a voltage of \$v(t)=sin(6t)[V]\$. Given the convention that the direction of the current is inverse of the direction of the voltage, ...
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81 views

Why is the impedance zero at cutoff frequencies in a series RLC resonance circuit?

I see that, in many derivations in the frequency analysis of series RLC circuits, \$X_L - X_c = R\$ or \$Xc - X_L = R\$ is considered at lower and higher cutoff frequencies. So does that mean that the ...
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3k views

How can there be a current without a voltage?

Recently while trying to understand inductive AC circuits better, I got very confused with a question. Let's suppose we have a purely inductive AC circuit with ideal wires and a switch. Let's also ...
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1answer
41 views

Choose RF block inductor value

I have inductor to block RF. My signal is between 1 and 2 GhZ. How should I choose the value of this inductor ? 1µH is enough ?? What are the other parameters to take care about ?
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1answer
31 views

Active RF Antenna power PCB layout: where to place the inductor for a bias tee?

I have an active RF antenna that is powered through an inductor in a bias tee network. How should I draw it on PCB layout? I have 3 ways to do that. In these layouts, up is capacitor, bottom is ...
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160 views

Question about ideal transformers and inductors

Recently I was studying about alternating currents and transformers and I got confused about some of the concepts. I tried a lot of sources but none of them seemed to address the problem. I ...
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2answers
117 views

Does AC phase shift violate Ohms law?

Ok, so I am not new to electronics by any means, but I still can't grasp one key concept: AC voltage-current phase shift. I understand the math behind it, but I need someone to explain to me how it ...
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46 views

What would be the voltage across the across the inductor just after time t=π/wo if the diode wasn't present?

Basically, this is a diode and an L-C load. Now I was wondering if suppose the diode wasn't there and it was just a source Vs, inductor and capacitor. Everything else would be the same except when ...
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48 views

Buck inductor current ratings

we are designing a buck using MIC23350 to generate 1.8V @ 2A. Input - 2.5 to 5.5V - typical is 3.3V or 5V. Switching frequency- ~1100khz. Nominal current is ~0.5A, Max current can be 30% higher. ...
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24 views

How to choose replacement capacitor/inductor in a simple RLC blackbox?

Assuming there's a circuit that we can't see but we can guess how it works based on what it's made for. We know (or just are pretty sure) it's an RLC circuit with no digital parts. From what I've ...
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46 views

Wireless power transfer circuit to attain ~5W of power on the receiving end

I am designing a WPT system to run a ws1812 based pixel chain. The ws2812 pixel chain runs on 5v and consumes 500-800ma of power, means 2.5w-4w. The system I made is not able to transfer adequate ...
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35 views

What material of a core put into the inductor would decrease the current?

Consider the \$AC\$ circuit: For various \$U\$ values set by the potentiometer, we have measured the current \$I\$ flowing through the circuit with and without core put inside the inductor \$L\$. As ...
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1answer
43 views

How can I find mutual inductance and coupling coeffecient of coupled inductor knowing turns ratio, primary and seconday inductance?

Trying a simulation in PSIM I have turn ratios and primary and secondary inductances but don't know how to find mutual inductance and coupling coeffecient of coupled inductors
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44 views

MIC4830 output voltage too low

I have built the typical applicaiton circuit from the MIC4830 datasheet. I have used the values for 0.4inch2 EL panel running at 900Hz (REL=0.369MOhm, RSW=321kOhm). The input voltage is 3.3V. My ...
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103 views

Is it possible to input DC PWM signal to a transformer?

I need to create a 100-120V 50mA output from a transformer. I do not need continuous steady output (no need DC 120V a 120V pulsating signal on output is enough.) N1/N2=1/12.2 secondary impedance ...
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2answers
74 views

Ringing seen when a zener diode is used with series diode as a snubber

I am trying to simulate the snubber circuit as given in "A zener with series diode"? there is some ringing seen at ouput. Here is LT spice ckt: Simulation result shows some ringing at ...
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1answer
84 views

How can we calculate the force of attraction between a coil and a ferromagnetic object?

As the question states I’m trying to figure out how I can calculate the force of attraction between the magnetic field of a solenoid (coil) and a ferromagnetic object. I suppose we should somehow ...
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55 views

Pulse Transformer design problem: cant understand for sure whats the reason or irregular output waveform?

A ferrite core pulse transformer provided with 12V PWM signal (as primary winding input voltage) as shown in Fig-1, produces irregular output voltage across the secondary winding as shown in Fig-2. I ...
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1answer
63 views

Voltage across inductor immediately after the switch is closed (again)

The switch in this circuit has been open for a very long time (such that the circuit is in DC steady state condition). What is v2? The correct answer is v2 = 0 V, but how does that make sense? I ...
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1answer
44 views

Voltage across inductor immediately after the switch is closed

The contact switch in this circuit has been open for a very long time. The switch is connected to the circuit at time t=0. What is the voltage across the inductor (VL) immediately after the switch is ...