An inductor is a 2 terminal passive device that stores energy in a magnetic field.
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0answers
47 views
Coupling capacitor voltage formula for SEPIC converter
I just designed a SEPIC converter, which is 6 V input, 300 KHz with 50 W, 15V output.
I used MathCAD to setup the current formula crossing the coupling capacitor, it seems correct, but I am confused ...
4
votes
3answers
124 views
How to Power a Tank Circuit with Mosfet without the Inductor Undesireably Triggering the Mosfet
BACKGROUND: I have this circuit that I asked about in a previous question:
Someone kindly explained that the problem I'm having with the circuit is that the mosfet is being triggered by negative ...
3
votes
1answer
58 views
Problem graphing inductor current-time
I am trying to graph the equation VbackEMF = L di/dt
When SW1 is off and has been off since negative infinity, I realize that there is no current in the system.
Now I imagine SW1 being pressed. ...
6
votes
2answers
175 views
Inductor equivalent of capacitor's charge
Because inductors share similar equations in their charging/discharging cycles, I am wondering if inductors have something like charge.
Capacitors have capacitance and charge while an inductor has ...
1
vote
2answers
79 views
What is the current limit/saturation of series inductors?
I am currently trying to increase a 12Vdc 30A (from a computer power suppy) to 24Vdc 12A. The circuit I have used is based on a application note for the NCP3063 boost circuit with an external mosfet, ...
3
votes
0answers
185 views
Joule Thief - operation and the 'supercharged' version
I've made a joule thief, and it works fairly well, but not as well as I would like.
It's powering a 3.2v LED from a 1.2v battery, but it's very dim. I'm hoping increasing the voltage from the JT ...
4
votes
1answer
168 views
LED driver circuit interfering with 555 timer?
Below is a circuit I put together that uses a 555 timer and an LED Driver:
But the strange thing I see is that the timer does not follow the 1.1*R*C equation. The led remains lit for much longer.
...
6
votes
3answers
207 views
What's the best/easiest way to measure an unkown inductance without an RLC meter?
Is there a decent way to measure inductance accurately using an oscope and a function generator? The best method I can find is to build a tank circuit and sweep the frequency until the highest voltage ...
4
votes
1answer
113 views
DIY Inductor: Solve for number of turns without knowing the length?
I'm trying to wrap my own inductors (air coil) for an RF circuit that I am making and I am having a little trouble solving for the number of turns I need to reach the desired inductance.
...
5
votes
1answer
72 views
Cutting an RL Circuit
I was solving some problems with RL circuits today and a thought occurred to me that I couldn't answer... Say you have a Vsource Resistor and Inductor all nicely in a loop. You let the voltage source ...
1
vote
1answer
174 views
Getting Right parts and building ZVS flyback correctly
I recently built a 555 timer flyback driver. I used 2 IRFP450 MOSFET's in parallel to drive it and I got pretty good arcs. Something always seemed to fail, and I always was buying another 555 chip or ...
1
vote
2answers
146 views
Laplace Relation to Capacitors and Inductors
Can anyone recommend a good resource to understand how a capacitor works as an integrator and an inductor works as differentiator? I'm looking for something to show me how the laplace transform comes ...
1
vote
2answers
101 views
Inductor DOT for RF
I recently looked at a reference design for an 433MHz transmitter and noticed that inductor orientation was specified (using the DOT).
On the pcb layout the inductors are placed close, so they will ...
1
vote
2answers
165 views
Discharging RLC. Kirchhoff's second law
I have been trying to solve this homework problem for who-knows how many hours. I could break it down enough as to specify the problem I'm facing into a single question:
For the following circuit ...
0
votes
0answers
36 views
Are there off-the-shelf sources for high-frequency high-current magnetics?
I'm often looking for high-frequency chokes. My typical spec ranges are 500-1000 volts, 10-40 kHz, 5-200 amps. Off-the-shelf chokes in that range are almost non-existent from what I've seen. The ...
1
vote
1answer
65 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 ...
0
votes
2answers
110 views
What are the components needed for this receiver?
I want to build a simple crystal radio receiver. I do not want amplify the signal received. I want to detect the presence of a transmitted signal, and then use the presence of the received signal as a ...
2
votes
2answers
152 views
Solving first-order RL circuits
I apologize if this is a repeated question, but I couldn't find one that had the answers I need.
For the circuit in the diagram, the switch has been closed for a long time and at \$t=0\$, the switch ...
-5
votes
1answer
318 views
About Resistor packages, inductor packages and capacitor packages
I want to know what is meant by Resistor, capacitor, and inductor packages. what are differnt catagories in them.
6
votes
2answers
348 views
Can a Hartley Oscillator be built using Fixed Inductors?
I've been playing around with fundamental circuits (no professional EE background), and became interested in oscillators. I have been trying to build the Hartley oscillator as described here. The ...
0
votes
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
336 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. ...
3
votes
2answers
96 views
2 loads not working together on the same battery
One 12v car battery powers 2 loads. One load is 3.5A and the other is 100mA. The 100mA load is always on. When the 3.5A load gets switched on, scope readings show the amp draw momentarily dropping to ...
2
votes
1answer
85 views
Inductor behavior questions
Using the image below as a reference,
What would the two graphs look like if switched from a, to b, then back to a (instead of c)?
Why is a resistor used in the circuit? Alternatively, what would ...
4
votes
2answers
272 views
Inductor purpose
I've just almost finished building the Single Side Arduino, but I'm missing one component: the 100uH inductor L1, right next to the pin 7 VCC of the chip. I am wondering what is the purpose of that ...
5
votes
3answers
213 views
Anyone know the purpose of these two inductors around a metallic ring?
So this link on ebay shows a power board that I have taken out from my microwave.
What is the purpose of these two wrapped around a metal ring? Also in general what is the purpose of this power board ...
1
vote
2answers
195 views
Does Inductor saturation current play an effect in SMPS design?
I am currently designing a DC-DC Buck power supply and now that I have chosen values for all my resistors and capacitors, I am looking for actual components. I was wondering if the saturation current ...
4
votes
2answers
222 views
What is “Two in hand” coil winding ? How does it affect the inductor?
Having to wind an inductor, I was advised to do it "Two in hand". I understand it means using two wires connected at both ends. Do I need the same amount of turns ? Is the inductance affected (same ...
6
votes
2answers
210 views
Will placing inductors near each other have adverse effects?
I want to place two inductors next to each other on my PCB, will the fields interact in a way that would adversely affect each other?
If it's important they are 1mH each, with a 8V peak to peak, ...
1
vote
1answer
110 views
Help reading inductor label
I'm taking apart some old electronics, and I see an inductor with the following on the label:
TV
1415
-B
Here's a photo:
I searched online but what I found ...
2
votes
1answer
187 views
Current source with no voltage drop
I'm designing a device with 3.6V Vcc and RGB LED. Blue part of an LED has the voltage drop in the range of 3.2..3.6V and i have to drive it with current limited to 30..50mA. This gives a restriction ...
3
votes
2answers
432 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 ...
4
votes
3answers
400 views
How to choose a inductor for a buck regulator circuit?
I am designing a buck-regulator circuit, with possibly the MAX16974 as the regulator. I have never done such a thing before, and actually not too much analog electronics at all. I got stuck at the ...
0
votes
0answers
230 views
How do you directly determine the approx. value of internal resistance of inductor in LC circuit
According to my calculation, it will take 0.005 seconds to charge this circuit to 8 Volts through the 50 ohms resistor.
Using $$ V_c = V_s(1-e^{-t/RC}) $$
How do you determine the effective ...
7
votes
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} > ...
0
votes
2answers
363 views
Power loss from an inductive load
A problem reads "A single phase 50 Hz generator supplies an inductive load of 5000 kW at a power factor of 0.707 lagging ... "
How can there be real power loss from an inductor?
3
votes
3answers
931 views
Behavior of RLC circuit elements at t = 0
I'm wondering what are the behaviors of the inductor, L, and capacitor, C, at t = 0+
Please correct my understanding of the above circuit if I am wrong.
At t = 0, the capacitor acts like a wire. ...
2
votes
1answer
109 views
Deciphering Part Names in BOM
I need help deciphering a BOM that comes with a particular TI reference design. If you look at "Partlist.rep" in the zip file, it looks something like this [I've edited it down a bit]:
...
3
votes
6answers
689 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 ...
2
votes
2answers
217 views
Inductor ground, where to put it
So I'm building a tachometer for my car. It's pretty simple, basically I have a wire wrapped around the spark plug wire about 10 times, and the 30-50k volts travelling through the spark plug wire ...
10
votes
4answers
815 views
Can you store energy in an inductor and use it later?
My company uses supercaps to power the device if power is cut. I was wondering if you could do the same thing with an inductor. If you can't, why not?
1
vote
1answer
221 views
Alternative to inductor on IC
I was running through the datasheet of CC2500 (Low-Cost Low-Power 2.4 GHz RF Transceiver) which has a dimension of ...
1
vote
3answers
445 views
How to implement and tune a LC band-stop filter?
I have designed a simple LC band stop filter with a center frequency of 433MHz. The schematic looks like:
The caps are NP0 0603 and the inductors are from the Coilcraft 0603HP series. The values ...
6
votes
1answer
189 views
Why don't wires have to be “covered” when making an inductor? [duplicate]
Possible Duplicate:
Why aren't solenoid/electromagnet windings insulated?
Looking at some pictures of inductors, such as this one:
The wires don't seem to be covered with a layer ...
2
votes
1answer
263 views
Are capacitors and inductors capable of absorbing positive power?
A resistor is capable of absorbing positive power.
Why wouldn't this be true for capacitors and inductors?
4
votes
1answer
315 views
Inductive choke with bypass capacitors?
I've been looking at a few power input circuits and quite a few of them suggest an inductive choke with a large bypass capacitor followed by smaller bypass capacitors.
In theory this is what I ...
2
votes
1answer
142 views
Is This Dual Inductor Mode or Series Mode?
I'm speccing out another DRQ series inductor for modifying the DC1787A boost regulator demo board.
I'm unsure whether the placement in the demo board schematic is in "dual inductor mode" or "series ...
1
vote
1answer
221 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 ...
5
votes
2answers
213 views
What inductor to use?
I'm working on a device utilizing Atmel's AT32UC3C microcontroller. The datasheet and design checklist documents provided by example schematics utilizing some type of RF/EMI inductor to isolate the ...
1
vote
1answer
164 views
Why sine wave UPS triggering surge protector again and again
I recently open up brother's APC sine wave UPS to fix and trying to repair some damage that usually happen over time due to age by replacing components I suspect one by one.
When I start doing AC ...
