dc inductor

Do inductors work with pulsed dc? like would they become more resistive with frequency? Or would they do nothing because it's not ac and the electrons can't "bump" into eachother.

Topic by guyfrom7up   |  last reply


Inductor coils?

How would one go about determining the milihenries value of an inductor coil pulled from an amplifier, well different ones I have found. And living up to it's standards, google has found me no information but what an inductor coil is and it's function, but no information on how to find inductance rating.

Topic by Punkguyta   |  last reply


Inductor winding?

Once again, I come to you for help. I recently became interested in some kind of 555 device metal detector. The schematic calls for a 10mh inductor. However, my local Ripoffshack doesn't carry inductors, and instead I decided I could make my own. It's just a coil of wire right? Right, so I have some formulas to find inductance given things like length and width, and I wondered if there's anything I need to be aware of. Does a ferrite core increase inductance? Where can I get a ferrite core? Do I need one? Is there a sweet spot for inductors? Thanks, Mr. Merino

Question by mrmerino   |  last reply


Inductor Heating Problem Answered

I'm having a bit of trouble with an inductor implemented as part of a boost converter. The circuit works fine except for the inductor gets very hot within a few seconds after turning on. There are also noticeable high pitched noises coming from it associated with varying current loads. I'm not really sure what the issues are as the circuit is within the maximum DC current rating (circuit draws around 120mA, inductor is rated for 250mA) and resonant frequency is also quite low (around 1.5kHz). Datasheet for the inductor I used can be found here. Some help would be appreciated in determining what the problem is and in locating a suitable replacement inductor. Thanks.

Question by andy70707   |  last reply


Effects of Inductors Coupling?

This is a follow up post from this thread >> https://www.instructables.com/community/Guitar-Wah-Wah-Pedal-Help/ (It was about how to fix my Wah-Wah guitar pedal, it turns out the Inductor was not working, so I replaced it) I replaced a broken 500mh INDUCTOR in my guitar pedal with a new one. It works now. However, I am planning on keeping the broken inductor in my wah wah pedal (because it yielded a cool volume pedal sound). I want to rig up the circuit so that I can switch from from the GOOD conductor to the BAD conductor. My questions are: Will there be any major effects from having two inductors coupling? Should I be wary of the 'winding' of the coils? If so, what should I do in order to be consistent with the winding? And out of curiosity, how could I rig this up?  Here is the schematic >> http://www.voxamps.com/downloads/circuits/wahwah93.jpg 500mh Inductor = L1 I have 3 terminal DPST switch. This is how I imagine rigging it up: I'm thinking of having wires from the inductor terminals on the PCB wired to a terminal on the SWITCH, then to the INDUCTOR, and then back to the PCB. The same follows for the other (bad) inductor. If this is not clear, please let me know, or feel free to post a better way to rig this up. In summary for this last question How could I rig this circuit to switch between two inductors? Thanks.

Topic by Grizzly_Bear   |  last reply


Coil inductor make?

I have, what I believe is, a neodymium ring magnet (pictured) that measures approximately 1.6 cm across x 0.3 cm thick and it has an inner diameter of of about 1 cm. I have been debating on what to do with it (also open to suggestions) hence the title. My question is how do I attempt to predict the performance of a coil created with this? 

Question by Dauntless   |  last reply



what is the value of the inductor i have seen?

I have an inductor which has a "562j" written on it. is it 5.6microHenry which has a 5% tolerance.i need your help.thanks!

Question by cons11   |  last reply


how to make an inductor?and how much it (uH)? Answered

I want to make a flyback driver, i need inductor 200 uH

Question by Rendydevara   |  last reply


Can someone please explain to me what a Axial Inductor do?

Axial Inductor- i have a couple of these things, but have no idea what they do.  they look like a resistor.  can someone tell me what are they used for.  thanks

Question by trinidadmike   |  last reply


Digital Capacitance Meter? Answered

Can a digital capacitance meter measure the capacitance of an inductor?

Question by The MadScientist   |  last reply


How to replace an SMD inductor? Answered

I have an 2gen Ipod shuffle which I burnt. Now after a long while I found that an inductor cas destroyed. How can I find it's value?or Can I put a jumper instead?

Question by theVader75   |  last reply


Microcontroller based inductor winder? Answered

 Is there any way, and I'm sure there is but I don't know how to do it, to make an inductor winder that is programable. Any type of microcontroller brand would work, be it arduino, parallax, pickaxe, whatever. Basically what I would need is a code, and a schematic that would drive two servos, one continuos rotation to do the actual winding and one to move the inductor back and forth, to keep an even winding going. The code would have to dictate how many turns the servo does in order to get the desired number of windings. It can even have to be reprogramed for every inductor from the PC, to keep it more simple. --Thanks         P.S. Sorry if this question was difficult to understand, I didn't know how to put into words what I                           had pictured in my mind...

Question by arhodes18   |  last reply


Can you use standard choke inductors as electromagnets?

I am making a project where I need very small electromagnets to attract and hold a small metal flap closed when the circuit is turned on. Flap is about 1cm from the magnet and returns to this position via a spring when the circuit is off. In theory is it possible to use inductors used in electronic circuits (for interference suppression etc.) as an electromagnet? Thanks.

Question by laquermonkey   |  last reply


What is the equation to determine a coil's inductance? Answered

I have been looking for the equation to determine a coils inductance in henries, but I can't find it. I want the one that uses core diameter, wire thickness, and wire length to calculate it. (But I'll take any equation that will allow me to calculate it easily without test equipment) Could someone help me out?                                                                                                                                                         Thanks!

Question by transistorguy   |  last reply


Can anyone help me make sense of a ferrite core datasheet? Answered

I need help understanding a datasheet for some ferrite cores I bought to wind transformers on.  This is the datasheet: http://www.ferroxcube.com/prod/assets/tx513219.pdf.  The main thing I need to know is the inductance per turn of wire on the core so I can design the transformers to minimize inductive reactance and such.

Question by UbuntuNinja   |  last reply


Any tips on winding a toroid properly? Answered

Every time I try to wind a toroid for a circuit, it never works or it is very temperamental and does not cooperate with me. Any advice on how to wind a better toroid?                                                                                                                                                                                                                                                         Thanks! 

Question by transistorguy   |  last reply


Joule thieves?

I am trying to make a joule thief according to many websites and such, but it never seems to work, even if I follow the instructions. The joule thief I'm trying to make is one of the simplest, with a 1K resistor, transistor, tapped coil, etc. I think it may have something to do with the inductor, even though I've tried a whole different types. I got it to work once, though, when the 1K resistor was replace with a 10K resistor accidentally. I heard somewhere that the resistor should be around 1K up to 3K. Any higher and efficiency goes down. Is that true? And why doesn't the joule thief work when I use a 1K resistor instead of a 10K resistor? P.S: I have made many other joule thieves, my first one being from http://joulethief.com/kit.php, and my favourite, the supercharged joulethief from http://quantsuff.com/LED2.htm.

Question by .Unknown. 


How to find inductance of an unknown inductor? Answered

I have some inductors harvested from an old power supply.They don't have an induction rating and I want to measure them.How do I do this?

Question by Derin   |  last reply


What are the effects of Henrys in the use of inductors? Answered

I'm looking for information that might help me find a reactor for my variac setup. I noticed that almost every inductor I looked at has a Henry rating, I'm curious as to how this effects the circuit. After reading up on what a Henry is, I'm not sure I understand what it is exactly. I have also heard of people referring to inductors by their inductance, would they be referring to their Henry rating or their voltage/amperage rating? P.S. My variac is a 125/260v 11A military surplus, for all those interested.

Question by pmk222   |  last reply


Does an inductor start with a magnetic field, or does it only retain one as long as it is powered?

I am trying to figure out how to keep a reed switch on by proximity to a magnet. I read that an inductor stores the current as a magnetic force, so I was planning on just having the reed switch close to the inductor, and just use a small magnet to close the circuit initially. i was hoping the field from the powered inductor would keep the switch closed. Am I on the right track?

Question by redbaron1234   |  last reply


ATTENTION ENGINEERS: Inductor to limit inrush when starting an electric motor?

The situation: I am using a contactor (like a big switch) to start a brushed permanent magnet DC motor. I am not using a motor controller. The motor is a Mars 0909 which draws 4.8 KW continuous and 15KW for 30 seconds The problem: This current can cause arcing at the contactor which can erode the contactor's electrical contact points and perhaps stress the batteries or blow a fuse needlessly. The goal: Reduce inrush while the motor starts up. The question: My teacher suggested I use a large inductor in series with the contactor. Theoretically the inductor would resist the initial inrush of current and then its resistance would go way down. We looked around a bit and didn't find any motors in series with an inductor in series. Is there a reason why inductors an not typically in series with motors? Is this something like a "Peterson coil" or an "arc suppression coil"? Any idea what the formula would be to calculate the size of such a coil?

Question by snotty   |  last reply


Tesla Coil Secondary Winding Question?

Just curious, I'm working on a Tesla coil and I've run out of wire 1/2 way down the secondary coil. Does anyone think I could just continue winding with another spool of wire and solder the 2 ends together?  Thanks!

Question by transistorguy   |  last reply


How does an inductor cause current to lag voltage in the case of an alternating current, and why is this bad? Answered

Basically, can someone help me with this: http://www.alpharubicon.com/altenergy/understandingAC.htm ? What are the EXACT physics behind it?

Question by Xellers   |  last reply


how to measure inductance using a bridge?

My LCR meter can only read inductances of mH to a few Henries. I need to make a 470uH inductor, since in my place inductors are not so common. How can i measure inductances at microhenries if my LCR meter's reading capability only ranges from millihenries to henries? Someone told me to use bridges like wheatstone bridge or maxwell bridge to have an accurate reading, but i don't know how to do it. Can you suggest any reference? I prefer doing wheatstone. Thank you in advance :)

Question by codestroy7   |  last reply


Amperes

Im kind of interested in messing with some basic electronics (which i know very little about) and my question is if I have 2 dc devices that have a 900ma draw on both like 2 cell phones .... do I need 2 separate circuits that can handle the individual loads or do i need 1 circuit that outputs say 2a they both take what they need from?

Topic by cbubel   |  last reply


Would this work as a flanger pedal for a guitar? Answered

I am wondering if the would work as a flanger guitar pedal. For the variable inductor, I am planning on using a hand wound coil similar to one on an old crystal radio(quaker oat box one)

Question by josh1324   |  last reply


"Joule Thief" LED Night Light Kit is Now Shipping

Thank you so much for those who pre-ordered the kits! I have shipped all orders now, and the kits are in stock. New orders will be shipped within 2 days. To purchase, please go to http://www.theledart.com/blog/night-joule-thief. Please see this post for the pricing and more: https://www.instructables.com/community/Joule-Thief-LED-Night-Light-Kit-PCB/ Thanks!

Topic by ledartist   |  last reply


"Joule Thief" LED Night Light Kit & PCB

UPDATE: Everything is shipping now. My instructable is here: "Joule Thief" LED Night Light  Check out the new color changing Joule Thief! KIT Pricing is $10.50 for the kit. Kit 5 Pack Save by ordering 5 packs for $39! PCB Pricing is $4.50 for the PCB. Shipping is $5 for USA, $17 for the rest of the world. *** NOTE: The color of the PCB will be green instead of purple shown in some of the pictures. *** Payment To order, please go to my site - http://www.theledart.com/blog/archives/259. Click on "Add to cart" button and check out via PayPal. Please send messages or leave comments here if you have questions. Thanks!

Topic by ledartist   |  last reply


Can someone help me build this LC resonant circuit? and explain it to me Answered

"An LCR circuit 1 is comprised of a capacitor 3, inductor 5, transformer T primary winding 9 and resistance 11 connected in series. It is assumed that the electrical conductors connecting the various circuit elements and forming the inductor 5 and primary winding 9 are perfect conductors; i.e., no DC resistance. Resistor 11 is a lump resistance equivalent to the total DC resistance of the actual circuit components and conductors. The inductor 5 is wound on a core 7"

Question by Intercom D   |  last reply


SMPS formulas?

Are there any switched mode power supply formulas? I've been googling but I can't find anything... I need to know relation between duty cycle (I'm using square waves) frequency size (value) of the inductor output voltage output amperage how many amps should the inductor be rated for (is it how much your drawing?)

Topic by guyfrom7up   |  last reply


Oscillator Trouble/Math ?

I have a "step-up" transformer from a DVD player that I really want to experiment with, but I know I need some form of alternating current to use it. I just finished taking a 3-week summer camp at which I learned about electronics, and there I encountered the 555 circuit. It's simple to build; I can just connect all the pieces on a small breadboard, considering I have several 555 chips. But what makes me a little miffed is that anything over 6V could burn out the chip's components. So I gave up on the 555 oscillator, and turned to the simple(-er) LC circuit. I want to have around 60 Hz to simulate the mains frequency, but I have no idea what capacitance or inductance I should use. Furthermore, I don't quite understand how to achieve a specific inductance based on coil turns, coil diameter, coil length, etc. If anybody could clear me up on these concepts, I'd greatly appreciate it.

Question by Umniscient 


I already built a metal detector by using 555 timer IC. My problem is 10mh inductor? Answered

Can you give me a details of 10mh inductor? 1. The number of wires? 2. The number of turns? 3. The coil diameter? 4. The coil length? Thank you. I am hoping for your sonnest reply.

Question by teodygwapo   |  last reply


Alright.. So can someone explain to me what each part of a joule thief does? I understand the LED, Resistors and battery Answered

So, in a recent Instructable about a Joule Thief, I was slapped in the face with a gap in my knowledge. I have no idea what the toroid DOES, I know it's an inductor... but is it suppose to transform low voltage to higher voltage? What happens If I wind it more? How about less? What does the transistor in this setup do? In a recent Instructable, as I was saying, they did it with only a regular inductor. I'm in the middle of finals too, my brain feels over used...

Question by Junk_Wizard   |  last reply


Please can someone give a brief tutorial on fm/am communication circuits?

I want to understand inductor capacitor circuits for my rc-car. please can someone give a brief tutorial on 4 channel communication circuits. I have tried searching a lot .. I got to know that inductor and a capacitor together oscillate and create a certain frequency and emit it trouhg the antenna .. whereas the receiver ..through the antenna receives it and again the inductor capacitor circuit sorts out a certain freuency and lets it go ... then the capacitor or a diode(think so) removes all the further disturbances.... I want to know the whole circuit properly ... and which Integrated circuit to use ....

Question by harshesh   |  last reply


Would this schematic work as a simple flanger? Answered

Would this simple schematic create an effect similar to that of a Flanger guitar pedal? The diodes prevent the signal from traveling backwards. On the top, the inductor (variable and homemade) slightly delays the signal from the guitar, and it is rejoined with the original signal below it. Would this cause a wobbly effect like a Flanger? Definition of 'Flanging': http://en.wikipedia.org/wiki/Flanging (link)

Question by josh1324   |  last reply


PCB traces? Answered

so if i have a high current device (inductor) on a pcb? it will run somewhere around 2 amps of power. Is there a minimum trace width to keep my pcb trace from being blown up?

Question by astroboy907   |  last reply


effecient charger making?

I wanna make a charger for 4v, 0.5A batery 1)just suggest me the value of capacitor and inductor for filter ckt 2) and wat ampere of current should be sent to battery for fast recharging (at safe zone

Question by electrical sniper   |  last reply


How is it that I can measure voltage across an unplugged wall wart? Answered

I have a 9V wall wart that's been unplugged for 2 days.  I hooked it up to my volt meter with intentions of checking the polarity as I plug it in.  Without plugging in the wall wart I attached the meter leads to the exposed wire of the wall wart.  It immediately showed a voltage of -10 point something.  I was glad to find the wires were backwards which explains my fried regulator; however how is it that I was able to pick up a voltage, even after discharging it the voltage slowly rose again, unplugged!  Does this have anything to do with earths magnetic effects on the inductor?

Question by Dude Man   |  last reply


Is it possible to build a spark gap using a fluorescent light ballast?

This is for a school project. We need to build a spark plug out of an LRC circuit and a 1.5 V D size battery. I was hoping to do it with a fluorescent light ballast as an inductor. The longer the spark in distance, the better.  Thanks.

Question by paul0   |  last reply


Please can you give me the detail about the metal detector project???

What should be the frequency range for 555 timer??? also during the process of testing when i connect the inductor,everythng goes wrong..buzzer doesnt give sound..why is it so??? Pls can you give me some idea?? Its very urgent

Question by skharel   |  last reply


-12v leads to GND?

First off, i apologize for asking so many questions. google couldnt tell me a single thing about what i wanted to know, which was how the -12v is created and why a computer needs it. so i turned to a broken power supply to see is the -12v connects to a IC of some sort, which i would assume creates the strange voltage, confirmed by a datasheet. i completely traced the traces with a multimeter and at one point a capacitor went to ground close to where the -12v connection is on the board, after an inductor of some sort. the trace continued, and lead to a pin on the transformer, much to my disappointment. BUT that same trace was directly connected to ground, so now i am confused, does the inductor type piece createthe -12v? there was a diode as well, but i thought nothing of it or its place on the board.. i have a feeling i should have, shouldnt i? fed up and confused by the power supply, i turned to my motherboard. where the -12v leads to a smd capacitor and then traces from the capacitor, to ground, and nowhere else as far as i can tell with a multimeter and a dark blue motherboard. then i bring up the picoPSU, how do they make the -12v, if it is even made? is there a chip responsible? or a inductor like i found in the power supply? -5v has been omitted form power supplies, so im assuming that the same can be done by -12v, right? and wouldnt you get a -v type measurement if you put the + test lead on the - terminal and vice versa?

Question by zack247   |  last reply


What specific parts do I need to assemble a good quality crossover for my speaker setup.

Hey guys, I wanna inquire you about the specific types of capacitors, resistors and inductors that I need to assemble my crossover, I don't have the DIY kit, so I'm gonna build it myself. Thanks for the detailed response guys. Your help will be much much appreciated. :)

Question by Dwight ReginD   |  last reply


Electronics Help

Hi ppl,I am currently making a variation on this circuit:http://www.edn.com/article/CA257052.htmlhttp://www.edn.com/contents/images/257052f1.pdfI understand how it all works but do not understand the principle of the inductor capacitor used (bottom left), if anyone could give a brief explanation of this (links are good too) and also some formulae i would b e very greatful!!thanks

Topic by drummer ian   |  last reply


Testing Tesla coil frequency with a multimeter frequency (Hz) meter?

My multimeter can measure up to 20MHz and I was wondering if I could test the resonant frequency of my Tesla coil by running it (untuned) then having the multimeter attached to an inductor a few feet away?  Would this work or would I need some kind of small circuit attached to the multimeter as well? If I could do this would it work with the primary as well?

Question by The MadScientist   |  last reply


help needed on LED music box

I want to build one like https://www.instructables.com/id/Music-LED-Light-Box/ , but with some LED only blink to bass (low range sounds), some to mid range, and some to only high range. Take this as an example: https://www.instructables.com/id/Music-Flashing-LED-Lights-how-to/ except I still like the idea of running through a mini jack. I've done a lof reading and many people have suggested using inductors as low-pass filters. New to electrical things, I am really unsure what to do. My design in mind is with 24 LEDs, 12 blink to bass, 8 blink to mid range, and 4 blink to high range. I'm planning to use a 12v DC charger with LEDs specs of 30mA forward current, 3.5V forward voltage. I understand having a VR will make the LEDs more consistent. Can someone possibly draw me a schematic with the right resistors and inductors? help would be greatly appreciated.

Topic by robertmai   |  last reply


How do I build a DC-DC boost converter?

Hey Guys! I want some advice regarding boost converters. I want to charge a capacitor rated for 450v 1150uF using a boost converter with input voltage >12 volts. What kind of inductor values will I need? What should be the duty cycle and frequency of the square wave generator? And is there any formula to calculate this or a calculator? Thanks in advance, IndianHacker002

Question by IndianHacker002   |  last reply


Joule thief running a CFL?

I've seen a lot of videos of people making joule thieves to power CFLs, with only one or two cells. (These actually work, right?) However, most of them require large (larger than a soda can) inductors and/or ignition coils and transformers. Is there any joule thief (or circuit) out there capable of running a CFL at full brightness, with around 6V, but at the same time being as small and uncomplicated as possible?

Question by .Unknown.   |  last reply


Can someone help me with schematics please?

Can someone please tell me about the capacitors i should be using in this schematic?  Like i know i need a 0.01uf but what type of capacitor? and (V)? also what is a 6pF?   Last question is about the #16 wire.. Im guessing this is just a inductor i can make by wrapping it around a pen 6 times? but do i use magnet wire or any old regular copper wire? thankyou.

Topic by andrewlapham2010   |  last reply


Why does this boost converter circuit not work?

I tried this circuit using a 3.7v supply and instead of a 12v Zener I used a 5v Zener. I also used a 22uH inductor. I get 5v no load but when I add a load the voltage drops a bit and the current is 50ma max. Why is this not working and what could I change to make it work? If this is the wrong circuit altogether, then what discrete circuit would work? http://www.aaroncake.net/circuits/6-12conv.asp

Question by Davis Lambert   |  last reply