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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2answers
59 views
Find the current in the circuit after 20s if the initial current was 0
An inductor in an electric circuit is essentially a coil of wire in which the voltage is affected by a changing current. By definition, the voltage caused by the changing current is given by ...
2
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2answers
101 views
Wireless transmission of energy through a layer of non-conductive material
Is it possible to effectively transmit energy by electromagnetical induction?
I have a plate of nonconductive material (5-10 mm) and I would like to transfer electrical energy from circuit on one side ...
5
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1answer
82 views
Controlling an electromagnet strengh with arduino
This previous question Controlling an electromagnet with Arduino deals with binary control (ON or OFF) only.
On my side I need to choose the strength of the magnetic field.
It is a home made ...
6
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3answers
263 views
How to wind a toroid for 170 uH Inductor
I am planning on buying a toroid core from Digi-Key. I want to be sure that this is the right type and that I can achieve 170 uh inductance with 22-18 AWG wire. How can I wind this and what is the ...
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1answer
66 views
R-L Transients Storage Phase: “Inductors” Help?
The below expression is for finding the induced voltage across the coil (inductor) at a certain Time Interval. Furthermore, the additional expressions are to find the induced voltage at 1T and 5T. I ...
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1answer
113 views
calculating inductance formula
what is the formula for caculating inductance on the basis of
1)No of turns.
2)Diameter of the wire
3)Diameter of the wounded circle. ?
how to calculate the capacitance value in ceramic capacitor ...
4
votes
4answers
344 views
How do I select the correct inductor value for the following buck regulator?
First of all, I suck a bit at math, and I'm no electronics genius, so the stuff I do is for fun and for learning purposes...
I'm working on a buck converter circuit to convert my USB Vbus 5V to 3.3V. ...
4
votes
1answer
138 views
Proposal for building Low-Current 220VAC Current Detector
I have been reading many such articles and have found no way to simply detect flow through a mains wire at low current.
At .27A for one LightBulb, I was calculating .05mA out of commercial 1:2000 ...
3
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1answer
89 views
Name for circuit with multiple paths with aim of reducing inductance
Trying to find the best way of describing a circuit that uses multiple separate physical paths to reduce effect of inductance on by HF signals.
Is there a term for such?
3
votes
1answer
318 views
Simulating real world transformer with LTSpice
I'm studying LTSpice, and I'm playing in transformer simulation. I want to modelize a real world power line transformer in a reasonable way: I mean I don't need an exact simulation of some specific ...
1
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1answer
59 views
Capacitive pen input sensors on screen edge
I've got a couple Kobo Touch devices in my possession. I've recently started hacking on the software. I'd love to enable stylus input by putting a Wacom or similar tablet behind the screen, but I ...
3
votes
2answers
438 views
PCB Trace inductance
I am planning to do a high current (200A+) PWM in a PCB and I am afraid the PCB traces inductances will be a huge problem...so I have some questions:
1- How may calculate the trace inductance?
2- As ...
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1answer
104 views
circuit equations derivation problem
I'm trying to derive from scratch the differential equations that characterise Chua's circuit.
Here are the ODEs I obtain from that diagram. Current is positive if conventional current goes + ...
7
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2answers
249 views
Transformers as Inductors (Weird Results)
If a transformer's primary and secondary are connected in series, then the total inductance of the result, is greater than the summation of each coil separately.
That is to say: \$ L_{total} > ...
3
votes
6answers
696 views
how a phase delay occurs in capacitors/inductors with visual images
Capacitors provide a phase delay between the current and voltage. Current leads the voltage by 90 degree. I was taught these only with the equations. But I want visual intuition, what happens in the ...
17
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2answers
931 views
Why are lightbulbs considered resistive load?
A lightbulb (a plain old incandescent lamp) is typically brought up as an example of resistive load.
Yet the filament is actually made of several feet of very thin wire cleverly coiled to form a ...
1
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1answer
228 views
How to determine the force of a solenoid based on inductance
I'm looking to potentially build my own small solenoids, I thought perhaps that I could take an Air core inductor, a spring, piece of plastic, and conductive core and build my own. Is there a way to ...
0
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1answer
580 views
Does anyone know what is the inverse of the inductance?
That's for a homework. I'm asking what is 1/L, where L is inductance?
I mean, as the inverse of the resistance is conductance, what is the inverse of the inductance.
2
votes
1answer
120 views
Inductance of a HDD BLDC Motor Phase
So I have set up a little experiment which involves a HDD BLDC Motor, a scope and a multimeter. Pretty simple, I know. Is it possible to determine the inductance of a phase by the voltage the phase ...
5
votes
3answers
441 views
Long transmission line inductance with SPI
I have a PCI 5V GPIO card which bit-bangs SPI over a 10-foot cable. The SPI clock is running at 800Khz. The cable connects to a board and the SPI lines feed directly into the SPI IC's. I know SPI is a ...
4
votes
2answers
935 views
How do I use a transformer as an inductor?
Lp: Self inductance of the primary winding.
Ls: Self inductance of the secondary winding.
Lm: Mutual inductance between the primary and secondary windings.
Assume that I need an iron core ...
2
votes
2answers
508 views
Determining the coil inductance of a relay when the relay is on
I'm trying to measure the coil inductance of a relay when the relay is on and the normally open pairs of contacts are closed. The relay has a rated AC voltage of 110V and a rated current of 21mA. I ...
1
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4answers
323 views
Is there a something else I could use in this circuit instead of inductor?
I'm making the analog interface for MCP3909 chip ,
I'm having a problem in finding any inductor where I live ..
I've two question :-
Is there a substitute of this inductors ?
What's the reason ...
5
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1answer
541 views
What does the “L” in inductance stand for?
"R" is resistor/resistance, and "C" is capacitor/capacitance, that makes sense. But where comes the "L" for inductor/inductance come from?
edit: Wikipedia says it's possibly in honor of Heinrich ...
7
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3answers
656 views
Cooper Bussmann's screw-in Edison-base mini breakers aren't for inductive loads. What does “inductive” mean?
I'm thinking of buying some Edison-base screw-in miniature circuit breakers to replace some of the fuses in my house. There are some made by Connecticut Electric and some made by Cooper Bussmann.
...
1
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0answers
106 views
Salient Pole Machine Inductances
While dealing with a salient pole machine, the stator-rotor inductances get modified through the addition of an extra term which is multiplied with the cosine of twice the electrical angle of ...
1
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2answers
683 views
Transformer Design: How do I set an N1/N2 ratio by means of selecting winding inductances?
I'm trying to simulate a transformer by using a circuit simulation software. In my requirements sheet, three specifications are given for the transformer:
Maximum power (\$P_m\$) of the transformer ...
11
votes
2answers
337 views
Negative Inductance and Cascaded DC/DC Converter Instability
I'm trying to debug a pair of cascaded DC/DC converters and have ran into a brick wall. The local FAE said that it is probably something to do with "Negative Input Inductance" on the second converter ...
1
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1answer
341 views
Do diamagnetic material exhibit induction?
Silly question perhaps, but do metals with the property of diamagnetism also exhibit inductance? Would a fluctuating magnetic field induce a current in a diamagnetic metal?
1
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2answers
1k views
Inductance and “kick back” voltages
I'm trying really hard to understand inductors and their related kick back voltage when the current is suddenly interrupted.
Example ascii art:
1 2
| |
+ ----- ~~~ --_-- -
...
0
votes
2answers
388 views
What is the best way to filter out noise on data line?
I am working on a product that has a controller connected to a device via an 8 conductor cable (an ethernet cable). The cable length varies depending on where the device is installed but the length ...
2
votes
3answers
449 views
Does direction of current flow affect induced current?
I am working on a pcb design. On the board there are two separate areas where I have a constant 5VDC trace running close to and parallel to another trace which has a pulse-width modulated 5V signal ...
2
votes
1answer
663 views
Series to Parallel inductance conversion
Reviewing some material I thought I understood, but it turns out there's some subtlety I'm not getting. The usual formula for calculating the Q of a non-ideal inductor is \$\frac{Xs}{Rs}\$, where Xs ...
4
votes
1answer
247 views
How to estimate inductive coupling between distant air coils
I have two air coils. They both have diameter d. There is a distance D between their centres.
D is much greater than d (more than 10x greater)
Both coils are at different angles, a and b, relative ...
3
votes
1answer
130 views
Peaking Inductance
Could anyone please explain the working of so called 'peaking inductors'? I know they are used to enhance the bandwidth but how do they do this?
1
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3answers
700 views
types of resistors and inductance
So while trying to interface a 5v SPI to a 3.3v SPI device, using the inline resistor method outlined below,
http://www.sparkfun.com/tutorials/65
I discovered that at high clock speeds (above ...
6
votes
6answers
490 views
Could induction thaw ice?
Last week we had very cold weather; and as a result there were lots of frosted pipes (iron and plastic). I spent a lot of time defrosting metal pipes with a torch, but could not do the same with ...
13
votes
1answer
659 views
What is this squiggly trace for?
It's on pin 14, which is the master clock input (MCLK) of a WM8761: Low cost stereo DAC. I'm guessing it's meant to act as a small inductor? But why would you want that on a clock input?
4
votes
4answers
421 views
Theory: With an AC circuit adding capacitors will cause the current trend towards leading
so if you add enough caps can you emulate what an inductor is doing, ie. Lead the current so far that it appears to be lagging?
I assume this doesn't work, why not?
