Search for crossover in Topics

about crossover?

I decided to start my own project  ---"a portable 2 way speaker with Bluetooth"--- but i have some doubts, if my woofer hit from 60hz to 10 kHz and my tweeter hit from 3.5 kHz to 20 kHz, what do you guys think my crossover should do its magic ? at 3.5 kHz or at 10 kHz ?? Or maybe any point from 3.5 kHz and 10 kHz is ok?   or im wasting the woofer capabilities if i cut around 3.5khz when it can reach 10khz thanks beforehand

Question by javierj9    |  last reply

Digital crossover..?

Well people, since no one want's to help me 'Build' a hardware crossover, perhaps someone on here might know of how I could use one of my spare laptops and feed my input signal to my amp into the mic port and equalize it/cut off the high freq's and send it back out the headphone jack. Surely there's some kind of program that would give me control over the output signal like giving it a sharp cutoff at 60hz or something like that. I'm tired of trying to figure out what to do with these laptops laying around, so that's why I'm asking would it be possible to turn my dell (2ghz 512mb of ram, simple audio card) into a digital crossover with even a visual output would be nice. Anyone have any suggestions on how to do this?!?? Thanks!

Topic by Punkguyta    |  last reply

Computer controlled crossover?

Hey guys, I've been wanting to ask someone about this idea for a while now. You know how you can get programs like SRS Wow that's built into windows media player? There are also other assorted Equalizer programs (with sliders) or for effect, to change how your music is playing. If these programs can do this merely with cpu power, is there a way I could have a source from the mic/input plug on a soundcard in one of my spare towers, and say, re-route it to the speaker/output on the card, but say, have a subsonic filter in place between the input and the output of the card, using only software? I'm pretty Effin sure this has to be possible, and yes I can take into consideration that there could be some considerable cpu usage for realtime playback. My goal would be to say set in place a 20 or 30hz cutoff point and then run that to my subwoofer amp, or use two seperate towers, and run my other subwoofers I have sitting around, but they need a higher cutoff point as they are only 8-10inch woofers. Could anyone lend a hand?? I know this has to be possible somehow.

Topic by Punkguyta    |  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

Audio low pass filter (crossover)?

Looking at a crossover inside a speaker box, I see some inductor coils and capacitors. As  understand, it seems capacitors are high pass components, and inductors are the low pass components. What is the formula converting frequency in Hz into inductance of the inductor coil and/ or value of the capacitor. (I would be looking for a crossover around 30 - 40 Hz) To me, it seems logical to put this crossover not in the speaker box, but in front of the amplifiers, so the remaining audio spectrum can selectively amplified, which should result in some more power...  True? (I see some recommendations for active crossovers, but the theory is way over my head).

Question by BobS    |  last reply

Need speaker/crossover help - modifying Leslie cabinet?

Hello, I have a Leslie 125 that contains a 20W tube amp and a 12" full-range Jensen. What I want to do is to add a horn to the cabinet in order to get more punch on the high end. I hope to do this without replacing the Jensen, but I will if I need to. What I don't know how to do is to pick a speaker and crossover that will be correct for the 20W amp and the speaker I currently have.  Looking for advice in choosing parts to buy. See image for what I want to do

Question by henktermaat    |  last reply

building a speaker xover

Im lookin to build a pair of passive bookshelf speakers and the crossover that is recommended for the drivers i have selected is at a minimum crossover frequency of 2,500 Hz @ 18 dB/octave. im new to speaker building so if anyone could help me to design this crossover that would be great. also if anyone could recommend any resources on speaker building that would be very helpful. 

Question by bowlen199    |  last reply

2 way Headphone crossover update

Hallo i want to construct a 2 way speaker crossover but i dont know how, im new to the electronics construction.The crossover for my application will be not for a speaker but for a 2way studio headphones from the 70s can anyone help me understand how to construct it and how to calculate and identify witch capacitor or coil to use for specifiec frequency ranges? and where to cuttof the freq ranges for smooth and natural sound?

Question by Jimarmaos  

Does anyone know about designing a multi capsule microphone?

We can create speakers with multiple drivers to cover all of the frequencies of human hearing, so perhaps people have come up with some ways to design microphones in a similar way with crossovers and such. 

Question by ANDY!    |  last reply

How do I tune this?

I bought a passive subwoofer crossover the other day in Toronto at some crazy combination Home Hardware/Chinese ran semiconductor supply shop. It was simply bought as a pcb in a bag for $18, which I thought was a good deal for that much so I picked it up. It has a large inductor coil and a 188uF 50V capacitor mounted on it, along with a positive and negative terminal soldered on for input/output mono speaker connections. I did hook it up to try in line with my sony stereo and turned the default button on my EQ on to restore the original signal and it worked pretty good to block out most of the signals like I was looking for it to do. However even with the boost on my EQ at 30 and 60 hz, it's not coming through to my sub even like before I hooked the crossover up. I was wondering if that's because of the capacitor or not? The little peice of paper that came with it said it was a 120 hz passive crossover and that it was workable with 4 or 8 ohms. I'll post pics tommorow when I wake up as it is lateeeee. I appreciate if anyone can help me as I don't wanna take the capacitor off there to find out that it wasn't worth it.

Topic by Punkguyta  

adjust normal speaker to use as guitar speaker?

Hi, As you know normal speakers (Hi-Fi, cassette players,...) and electric guitar amplifier speakers are different. Apparently guitar ones work in 75Hz to 5KHz frequency range.  I want to make a normal speaker to sound as much as possible, like a guitar speaker. after searching on the internet I found that with band-pass or band-stop passive filter I can achieve that. Anyone have any idea how can I do this and if this is going to work or make any difference? Do you have other suggestions (besides buying guitar amp or speakers ) ? Thanks  for your help

Question by ehsan_zt    |  last reply

true semi auto gun crossover

I have seen and built both ednator55's true semi auto gun and bballkidx's hammer operated pistol. The pistol swings a hammer to hit a rod and the semi a auto rotates a connecter to move a ramrod. This is more of an idea than a question but could somebody try to make a double action type gun. It is semi auto because it rotates a connecter but at the same time hits the bullet with a hammer. This would be most similar to some revolvers. This is just throwing an idea out there but I would be very grateful if somebody built this. Automatic 5 stars in my book. The semi auto gun is weak but semi auto. The hammer gun is strong and single shot. The crossover gun doesn't have to include a mag but it would be nice. Pmgroundhog

Question by pmgroundhog    |  last reply

is it possible to make a simple DIY crossover unit for speakers?

I have been wanting to make a crossover unit for some speakers (i literally have 14+ speakers of various sizes laying around) and i was wondering how feasible this is...

Question by deedeedee9    |  last reply

Do you need any help designing crossovers or tuning your speakers?

I am a professional loudspeaker design engineer with many years experience in Hi-Fi, Pro-Audio and Commercial. I have extensive computer modelling and design tools alongside proefessional acoustic measurement facilities. For a crossover design, send me the details of your project and I can send you the component values and schematic with system modeling etc. You will get your system modelled and EQ to give you the best possible frequency response for your project. For a cabinet tuning, send me the driver details and cabinet dimensions and i will calculate the port dimensions for you. This will get you the best bass alignment for your system and maximise the low end efficiency. The quality of the results will depend on the quality of the information available. Prices start at $25 for simple cabinet tuning. Cheers Dan

Topic by truecolour  

Question about speakers and amps? Answered

Okay, so I want to build a set of two-way speakers. BUT, I'm still confused on this one part. Do I need an amp, or some kind of receiver for them to work? Or can I plug them straight into the device? Thanks for your help, sorry if this is a dumb question.

Question by Zem    |  last reply

Is there an existing diagram to create a USB crossover cable?

I want to transfer files between 2 Linux computers without buying more flash drives, more SD cards, more network cards, more cables, etcetera. I only need this to work once in a great while. Could I simply hack up a male A to male A USB cable and cross the data lines? That is how it goes for all other transfer cables I know of.... I'm guessing that makes the most sense, but I'm still guessing. Can someone tell me if that should be enough to get the hardware "talking" properly. Another question (to post later) will ask about using Linux on the 2 connected systems, but without a proper transfer cable, the second question is moot. TIA.

Question by mmmmna    |  last reply

Would it be possible to create a wireless crossover cable powered by wifi? Answered

I was thinking maybe with an arduino and the proper shield, but I am not sure.  The reason is me and my friend want to cheaply use system link so we can play each other all the time, and we don't want xlink kai or something like that (due to lack of reachability; our computer is upstairs, and our xbox is in the basement).

Question by furrysalamander    |  last reply

I need help with selecting right crossovers for chosen drivers?

Attention Audiophiles What Crossover will suit for these components in a 2way bookshelf speaker? Also if someone can calculate a good volume for cabenit (without going out yer way) would be Amazing. Its my first speaker design im taking it slowly but days n days of research hasn't answered all my questions. (i learn better from doing, unfortunately not reading, and iv'e read myself stupid on the matter Help!) Thanks 

Question by scott_shot  

wiring lights into car speakers

I want to add some electroluminescent tape and panel to the portable speaker i built in such a way that it lights up when i turn the speakers on. my question: would it be possible to achieve this by popping the power leads of the 12v inverter into the positive and negative woofer terminals on the crossover along with the speaker cables already there? 

Topic by ambientvoid    |  last reply

Best way to crimp CAT-5e cable?

 (okay I am now having to retype this out as this stupid editor isn't working properly) I currently work at a dairy (or convenience/general store for you Americans out there) and I have been assigned the awesome job of phasing out the cash register with a fully fledged touch screen point-of sale system. This is how it goes: There is a computer 'out back' that controls the stock levels, reports and so on, and there is the touch screen system 'out front' that handles the transactions.  These two computers need to have a constant connection between each other. We were going to use Wi-Fi but we found that it's too unreliable and not very secure. SO we are using plain old Ethernet cable.  Now the problem: we have no router or switch so do I need to crimp the cable as a patch or crossover cable? And if someone could point me in the right direction to do this, that would be much appreciated (as everything I've looked at tells me something different every time). Cheers! (P.S I know CAT-6 is faster and more reliable, but I'm just using what my boss ordered)

Topic by asasklfjklasfkljasklfjaklfsjkl    |  last reply

Airsoft/Spudgun crossover: Anti-Personnel Explosive thingies

Its a PVC/ABS thing that works like a spud gun, but launches a powder cloud (and potentially BB's). It's remote-triggered, so it can be buried underground, and only the top has to be removed, so it can be permanent. It works in the same way as a spud gun. I'll try to get diagrams up tomorrow, and if I can build it, pictures and an instructable, of course.

Topic by Rotten194  

Set of dome tweeters (Too high wattage)

I have a set of dome tweeters that ran grwat on an old amp i had, thing blew out a few years ago, and just barely runs through another amp with the crossover and woofer. there is some jumpers in the crossover that say Tweeter attenuation -4dB stock setting --- -2dB 0dB Just as i put it right there. I want to know what attenuation means and how i can use the same amount of power into the tweeter, but make it louder. (It's pretty quiet.) Right now it is set at -2dB. Except the dB and numbers are lined up.

Topic by Yerboogieman  

Can Anybody Help me with Audio Terms?

I am on my way to build 3 way speaker system and this my first time. I heard that i have to make crossover into the speakers which will drive the low frequencies to the woofer and mid ranger whereas the low pitch to the woofer. I went to a site that calculates schematics for any sort of crossovers. But they ask me the several things out of them i understood some of them while others made my mind disrupted. so please state the meaning of the following: High Xover Frequency ( fh ) Low Xover Frequency ( fl ) Frequency Spread ( fh/fl )   here there were 2 options I.E, 8:3 octaves and 10:3.4 octaves Bandpass Gain ( g ) Crossover Type In the last one there were several options: 1st Order normal polarity 2nd order reverse polarity 3rd order reverse polarity 3rd order normal polarity 4th order normal polarity What are the differences between these crossovers? Which one is the best and why? If nothing is best so what is the difference? Sorry I am a novice. So guys please be easy on me....  Thanks In Advance :-)

Question by adarshnarsaria    |  last reply

Matching speakers to amplifier

I have purchased 2 Maxamp20 amplifiers ( and i am trying to match speakers to them, i've searched audio forums for information (that i mostly don't understand) and tried asking questions (that have been mostly ignored) and i think i've found appropriate speakers but i want to get a second opinion before i purchase stuff i might not be able to return. i don't have the space for and can't afford the weight requirements of a large enclosure but i want fairly high volume and wide dispersion so im looking at getting 2 of these PA horns ( to mount on top of a shallow down firing enclosure for 2 of these subs ( i know the subs work with that amplifier because they are used in Boominators ( but i have no idea about the horns. also assuming this setup is okay do i need some kind of filter or crossover (not sure of the difference) to split the sound safely between the midrange and the sub speakers?

Topic by ambientvoid    |  last reply

Help with my supplies? Answered

I have 2 units of 4" woofers of 4 Ohms and 25 watt RMS with a frequency response of 40Hz ~ 170Hz 2 Units of 3'' loudspeakers  4 Ohms and 10 Watts RMS with a frequency response of 160Hz ~ 20Khz and these tweeters  Can I make a 3way Speakers with these supplies and if yes please send me the crossover and L Pad schematics. Thanks In Advance

Question by adarshnarsaria    |  last reply

How to redesign an old T-shirt?

I have transformed an old T-shirt, it's crossover vintage-style camisole, I do think I have done a good design. However one of my friend thought I could do better on the color combinations, not just grey and white. Is there anyone have deep sight? Pls give me some suggestions.  Oh, forget to say, the link is here.

Question by DannyLord    |  last reply

Subwoofer Car Amp And a whole lot of mess? Subwoofer and amplifer crossover? Answered

Hi, today what I'm trying to ask is how could i get a car amplifier working in a household environment (i know how to get the PSU going and that side of stuff) My question is what sort of box will I need for the sub woofer and how will I wire it up will i need a crossover if so can you guide me of what to buy anything I should know before I attempt this will this work or am I just atempting something that will end up in a mess?

Question by Daniel Deacon    |  last reply

HELP PLZZZ....Why do i keep blowing my tweeters and horns?

Hello everyone i am kinda knew and would like to know what is going on with my setup. i got a pair of dual 18" speakers, each box has 4 tweeters and 1 horn and 2 18" speakers. when i first got these speakers none of the tweeters worked. i changed them and they popped again. These speakers are being pushed by an ep-4000 amp and they are bridged. Please help me with my problem. i don't want to change the tweeters and horn again and for them to pop. i am open to any suggestion. the speakers sounded beautifully until they all left one by one lol. Am i connecting something wrong? should i connect something to them? please help meeeee......................UPDATE:>>>>>.thanks to everyone for the responses....i believe that these speakers don't have a crossover in them..... but i put filters on each tweeter hoping that would solve my problem but that's when i was wrong and found out the hard way...........those are the speakers at the bottom........if i need a crossover what kind do i need???? what type of tweeters and horns do i need??? Filters??? capacitors??...what you guys recommend?? i want this to last a long time without blowing......Please guide me as i am a noob in this field...... thanks again *********************************************UPDATE 7-14-11************************************ so ive been messing around for a while and i havent had time to post anything up but i finally manged to make some is what i have done.....i went out and got myself two crossover for the tweeters on the top......i believe they were some eminence cross over rated at 3.5k and i got myself some selenium tweeters (4 to be exact) 2 on each the selenium tweeters are connected to the crossover (ONLY THE SELENIUM TWEETERS ARE CONNECTED.....SOUNDS REALLY LOUD WITH ONLY TWO SO OTHER TWEETERS AND HORN ARE DISCONNECTED) and the crossover is receiving the power from the same connection as the sub...but the sub woofers are just connected straight to the amp...........i was in a party and they were pumping beautifully :-) for a good 2 hrs.....then the fuse just blew away.....i dont know if it was because of the frequencies going in them from my drops.......i didnt even wanna use a mic so i wont blow them and they still of now i purchased the frequency controller i forgot the name.....but i can adjust the volume of the tweeters through there.....only thing is ive noticed that even while i have the volume on zero for the tweeters i still see the fuses lighting up like Christmas lights so im afraid their going to pop again.........if they do i was wondering if i can use those other fuse(GOLD FUSE) which is rated at 80amp a way higher rating power then those fuse that come with the crossover(DOUBLE SILVER FUSES CAME WITH THE EMINENCE CROSSOVER)......

Question by dman192    |  last reply

Can I fit a film SLR lens on a DSLR camera?

I have many old 35mm film cameras with some really nice telephoto and zoom lens. Can any be fitted on to Digital cameras? Is there a crossover guide any where on the web.?

Question by HVTXX    |  last reply

Vintage Headphone repair, help needed

I have some vintage Superex Stereophones, model Pro B-VI (with a google search only find an ad in a paper dated 1973 referencing them). They have both a tweeter and a woofer in each ear, and I believe the resistors in the crossovers have gone bad. The high end drops out now and then to pop back in after a short while or after a minor volume adjustment - other than that the volume is crystal clear. Am I right in assuming the resistors could be the issue? The other components in the crossovers are just inductor coils, which are know are for the low pass, so it can't be those. I know instructables isn't a electronics repair forum, but I wasn't too sure of where else I could ask and find knowledgeable people. I love this site. :) I.W.

Topic by incredibleweirdo    |  last reply

can you make a subwoofer from computer audio system go boom booom boooom in a car without adding an amplifier?

I have a spare logitech g51 speaker system and want to use the subwoofer in my car instead of purchasing an entire car designed subwoofer, box, amp, wires, crossovers, etc., etc.

Question by shhsahsim    |  last reply

how can I play PC games on my MacBook Pro at no cost?

My friend let me borrow his SIms 2 game for PC with a bunch of expansion packs, but the game is for PC, I only have macs in my home and I was hoping there was a way to play this game on my MacBook Pro, i'm extremely low on cash and wanted to find a way to do this without purchasing a $50 program

Question    |  last reply

Need help with making an amplifier

First of all I am only considering to make this amplifier I have not gone out and brought any parts yet although I have had a look around. If all goes well I will post an instructable of all the stages required to construct the amplifier.  I am looking to make an amplifier to be used with my computer and various other devices. This is the amplifier schematics I have had my eyes on.. I am new to all of this really but Ive been trying hard and eager to get this working.  Amplifier  I have designed this on Eagle PCB, need to double check the connections. Would be useful for some info on the width of the tracks as this was the element I was most unsure about. I am new to Eagle PCB so im not familiar with standard conventions and tricks.  Pre-Amp I have designed this on Eagle PCB, on a separate board again need to double check the connections.  Power supply  I Have got a basic 35v+/- dc supply schematic, it is based on a toroidal transformer, will probably need a inrush current circuit doing later. I have added the power supply components on the same board as the main amplification stage.  Frequency Crossover I have an idea of what I want to use, I was think a 2 way 2nd order Linkwitz Riley filter because I dont want some of the areas of the midrange to be lost, from what Ive seen on graphs, the low pass and high pass dip significantly closer to the crossover frequency. Ive selected some drivers that I liked. The tweeter has an impedance of 8ohms and a frequency response from 1.6khz to 20khz. The woofer has an impedance of 8ohms and a frequency response from 30hz to 4hkz. I read somewhere that it was ideal to crossover exactly in between the two i.e 2.8khz, let me know if you think otherwise.  Also Ive read up a bit on L-pads, would it be suitable/ worthwhile in this application? is it necessary to have the impedance seen by the amplifier constant, if so where it be? Ive looked up the components on a website supplying crossover and audio devices, there are many types of inductors and capacitors I am not entirely sure which type would be most suitable.  If somebody could help me out in designing the amplifier and understanding how all the circuits could come together I would really appreciate it. I  would definitely do an instructable of the construction of all the stages of this amplifier. Thanks in advance. 

Topic by Jarez Patel    |  last reply

Portable speakers in a PS2 Controller?

Using 2x2cm and 2x4cm speakers (4speakers total) preferably with a basic crossover and 4xAAA batteries and a 3.5mm jack for input. Perhaps a volume switch too (presumably this is a simple matter of a variable resistor. I have an idea of what speakers to use... two emac speakers and two 2cm Mylar speakers from maplins. Any help on what components I need ie. amps and capacitors would be great, or pushes in the right direction at least. thanks alot Matt

Question by blue-cat    |  last reply

Archaeologists + Cake nerds, recipes needed!

Sidestone Press is looking for nerdy archaeology cake recipes, if they get enough they're planning on turning them into a book. They contacted me after seeing my dinosaur excavation cake and need more nerdy cake recipes to make a book. This could be a fun crossover, but they can't make the book if they don't get enough content. Make an Instructable out of it and it's like a double-win! Here's the Facebook page, submit your recipe today and have it in a book!

Topic by mikeasaurus    |  last reply

Hi everyone, i need good low power amplifier ICs for speaker . Which IC can I choose?

There are requirements about amplifier IC for speaker :   - Sound quality must be good because I like non-lyrics musics and rock   - Very low crossover distortion and noise.   - Low power ( <30W)   - Output impedance 4Ω or 8Ω   - With bass booster I hope someone will answer ang give me a circuit diagram of this IC ( I need stereo, not mono or bridge ) Finally thanks a lots to people ! ( I'm not good at English, sorry )   

Question by Nikolai Petrenko    |  last reply

4 way spekaers - is the xover schematic correct?

My supplies A Tweeter with a frequency response of 20 KHz ~ 40 KHz, 8Ohms, 75Watts RMS/3000Watts Max, and Sensitivity of 105dB. A 4” Subwoofer with frequency response of 25Hz ~ 160Hz, 4Ohms and 25 Watts RMS Two 4” Full Range Speakers of 4Ohms and 5 Watt RMS Is the schematic mentioned in the pic is a suitable xover for my system please clear the nearest values to me Thanks in Advance

Question by adarshnarsaria    |  last reply

Determining the correct specifications of my subwoofer?

I have purchased a local brand sub-woofer which does not comes with any specifications except the following: Impedance: 4 Ohms Output RMS:20 Watts Frequency Response: 40Hz~170Hz Effective Cone Diameter(D): 4" However i wanted to know the following Equivalent Volume(Vas) Free Air Resonance (Fs) Total Q (Qts) Actual System Q (Qtc) Resonance Frequency (Fb) Is there is any way to determine these Thanks in Advance....

Question by adarshnarsaria    |  last reply

i have a receiver that reads at 120W is that enough to drive 2 speakers a tweeter and an external subwoofer ?

I have a receiver that reads at 120W is that enough to drive 2 speakers a tweeter and an external subwoofer the receiver says on the back 120V 120W 60Hz 170VA  so im guessing it runs at 120W per channnel at 8 ohms so would i risk blowing the amp or speakers if i plug an external subwoofer to the speakers and tweeters the recever does not have a sdubwoofer channel so would i damage anything at all with it in the channel as well by external subwoofer i mean it has its own power source its own crossover its own amp it has an rca in put or you can use the terminal plate it has as well this is the JVC RX 212

Question by fastcar123    |  last reply

Any help with my speaker building questions?

I'm not sure you'll be able to answer this. I was hoping to put one massive woofer (15") and send all low frequencies to it, and then put in two tweeters, hoping that it would somehow overcome the most likely overpowering bass. Is this a viable setup? Ideally, I plan on building these speakers for parties, where I just throw this in the car, drive there, and we're ready to go, don't need to deal with tiny crap speakers anymore. So, ideally, I want to create stereo sound on my tweeters, but just let it go for the woofer, since bass would obviously have no need for stereo. Would I need two crossovers, or just one? In my head, I imagine that I only need one crossover, followed by a stereo amp for the tweeters and a mono amp for the sub. I'm not 100% sure on that circuit though.I plan on using these parts:woofer:;=296-24635-1-NDwoofer amp:;=296-24635-1-NDtweeter amp:;=296-18033-5-NDSo, with that in mind, I'd love your help. Other Miscellaneous Curiosities:1) If you have any links as to where I can figure out the most audio efficient layout in order to achieve the best sound with this, that'd be a help too.2) Do I need a mid to help beat the woofer?3) In order to figure out the required power from the supply, I just need to add the max possible wattage from all the drivers, right?Thank you, Instructibles community.

Question by headinmysights    |  last reply

How big a battery for a portable ( bike) sound system?

Have several amps and several speakers... 1 The most modest: a 2.1 computer sound system, probably ca. 5- 10 W RMS, 18 V (I want to connect this to my 18 V portable drill batteries- how much run time ?) 2 The medium size: a 12 V  (2, or one) 16 A fused: 2 average 9 x 6 car speakers 3 The meanest: A big 4 channel amp, bridgable, 12 V, fuse is 36 A, a big sub and 2 average 9 x 6 car speakers Volume is determined by the MP3 player, I hope being able to make it, amp inputs are selected by a passive crossover I like the volume loud, but not extreme (< 100 dB). Runtime 5 - 3 hrs. How big a (car) battery I would need for solution 2 and 3 ?

Question by BobS    |  last reply

Sound card configuration problems

Want to configure my 7.1 sound card, which is embedded in the motherboard. Run windows 7. I used to just split the 'green' channel between my small 2.1 computer speaker system and home built full range 'rear' tower speakers with passive crossover, powered by an old 2X 100W RMS Sony amp, with very satisfactory results (movies, mostly reggae music). But finally I got a nice 10" subwoofer!  Time to make a proper setup! So I tried to plug the tower speakers in the black channel, and for now, the headphones, in the orange channel (while wiring the sub into a 4 X 40W  mono setup- Parallel , I assume????). To the control panel, sound, manage audio devices, speakers, configure (5,1 for now). Works like a charm: all tests OK, can hear all test sounds.  Restart... But W Media player, as well as other players (want to customize with Foobar_X_over eventually) don't provide any sound, except for the green channel. What am I doing wrong?

Question by BobS    |  last reply

LEDs or even EL wire that reacts to sound (not just an audio line)?

I want to know if it's possible to create a set-up that will allow me to utilize a small (mini) microphone and then filter the sound to have specific LEDs react according to the frequencies.  The filtering might need to happen through the use of custom built crossovers in order to filter sound, and that's fine. For simplicitys sake: let's say I want lows to light up red LEDs, mids to light up blue LEDs, and highs to light up green LEDs based on the audio that is around me. I don't want to have to tie into a phycial speaker or audio out as this needs to be extremely mobile.  It needs to be able to be battery powered as well. I'm seeing TONs of projects out there that take advantage of the physical line out or tap into the wire as it goes into the speaker.  Unfortunately, this won't work for what I'm wanting to do. I've come across this goodie, but I'm not sure if it's exactly what I need? Any ideas would be greatly appreciated!

Question by jbennett38    |  last reply

SEW DIFFERENCE! How to transform throw-away T-shirt into a wave of T-shirt?

It's difficult for me to throw away my T-shirt, they like my friends, we do have deep feelings with each other. So I decide to transform them, to give new life to them.  Here are what I tried. Actually, I do like sewing things in my daily life:). I share a brief recipe at Instructables. You can review Basically, I just have fun. However, more and more people were attracted and give me suggestions on how to design better, which inspire me to redesign more creative cloth.  In addition, I encourage everyone to redesign their own thing but not throw them away, because the things you used in your daily life  stands for your emotions in that stage, it's your life and your own thing. We can transform them or send someone who need it. Hopefully, DIY makes things different and make you different.

Topic by Wells_Tu  

Need a suitable Class D amplifer for transformer application

Hi,Hope this post find you well.My intention is to make an 3-phase power calibrator !Similar to this link, My current AMP design might be class AB type. I am not worried to much about PWM generation ruther I am thinking how can I move class AB to Class D amplification. A lot of the design effort relates to maintaining linearity and avoiding crossover distortion. In this case, 2 amplifiers( current, voltage) output will feed to CT and PT! Lets consider transformer load .REQUIRMENTS :1. The amp input should be plus and minus 7volt AC, 45-65Hz( 1 Hz has been converted to 1024)2. Amp operating voltage should be more or less 24v. 3. 2 channel signal (not sure PWM) should be use , one for current, one for voltage. 4.Can run current transformer(input 16.5 V/1.5 A) and potential Transformer (input15v/2A). PT output may be 15VAC.5. If possible both voltage and current amplification is required in one IC.6. Both positive and negative half signal should be amplify

Question by Hasan2015  

Updating 1980s X Terminals? Answered

Okay, so I've been trying to solve this problem for quite a while now, and I've simply run out of ideas. In my father's optical store, all of the POS computers are X Terminals. They are all connected to a main server in the back. The server is connected to a device which is kinda like an ethernet hub - on its a box with 16 RJ-45 jacks, and a cable coming out of it which connects to the server's parallel port. Each of the jacks are connected to a small adapter cable (filter? crossover cable?) and that cable has an ethernet cable coming from it into a patch bay on the wall. I'm almost completely sure that the cable is *not* carrying a tc/ip signal, because the back of the hub-box-thing explains that each of the wires in the cat-5e cable are assigned to carry specific parallel port signals. So, I'm pretty sure we have a parallel connection running over cat-5e. Also, I'm pretty sure the server is running red hat Linux, which is running an x-11 emulator. Anyway, from the patch bay, all the signals continue through Ethernet cable until they reach the terminal. There, the cable is plugged into an RJ-45 to parallel adapter, which then plugs into one of the two parallel ports on the back of the terminal. What I'm trying to do is to replace all of those huge, old and ugly X terminals with newer computers and monitors. I've tried connecting the parallel connector on the adapter to various computers and trying a bazillion programs, but I can't seem to emulate an x-terminal. So, any ideas?

Question by aelias36    |  last reply

Multiple Speaker Building Questions! :D

Hey guys, first post here, so be kind, I suppose. :PI'm building a set of speakers, loosely based off of the super loud, super long lasting speakers instructable (found here ) I wanted to take these, and make them significantly better.First of all, I was going to substitute in car speakers. The upside of that is that I also get bass without having to go out and buy woofers and wire up a crossover. I've been looking around on partsexpress, and it seems like most have an impedence of 4 ohms, and range from 75 to 150 RMS. I'm aware that the general rule of thumb is that you double the RMS for the amplifier. However, I'm not sure about soe of the other parts. Should the speakers be wired in series or parallel? If they're wired in parallel, should I be looking for an amp with 2 ohms of resistance, since it's two speakers at 4 ohms? If not, can speakers be easily wired in series?Next question, batteries. Where in the hell do I get some good LiPo batteries? I know this thing is going to go through electricity like candy, so I want high wattage and high capacity.The wattage brings me to my last question. These speakers are rated for a maximum input of 70 watts or more. I can't get a battery to go anywhere near that capacity. Will the speakers be harmed by a lower wattage supply? Significantly lower, I might add, most probably not more than twelve, even if I array the batteries into my own pack. How will that affect the speakers?Sorry, one last; concerning the rule of thumb in which you should double the voltage of the speakers RMS for your amp, if I can't find an amp that does that exactly, should I have my amp be slightly overpowered, or slightly underpowered?Thanks for all the help on this one :)

Topic by headinmysights    |  last reply

Batteries, amps, and watts, oh my! Help with my speaker build?

Hey guys, first post here, so be kind, I suppose. :PI'm building a set of speakers, loosely based off of the super loud, super long lasting speakers instructable (found here ) I wanted to take these, and make them significantly better.First of all, I was going to substitute in car speakers. The upside of that is that I also get bass without having to go out and buy woofers and wire up a crossover. I've been looking around on partsexpress, and it seems like most have an impedence of 4 ohms, and range from 75 to 150 RMS. I'm aware that the general rule of thumb is that you double the RMS for the amplifier. However, I'm not sure about soe of the other parts. Should the speakers be wired in series or parallel? If they're wired in parallel, should I be looking for an amp with 2 ohms of resistance, since it's two speakers at 4 ohms? If not, can speakers be easily wired in series?Next question, batteries. Where in the hell do I get some good LiPo batteries? I know this thing is going to go through electricity like candy, so I want high wattage and high capacity.The wattage brings me to my last question. These speakers are rated for a maximum input of 70 watts or more. I can't get a battery to go anywhere near that capacity. Will the speakers be harmed by a lower wattage supply? Significantly lower, I might add, most probably not more than twelve, even if I array the batteries into my own pack. How will that affect the speakers?EDIT: I could realistically reach more than that, although it'll start getting really expensive really fast.Sorry, one last; concerning the rule of thumb in which you should double the voltage of the speakers RMS for your amp, if I can't find an amp that does that exactly, should I have my amp be slightly overpowered, or slightly underpowered?Thanks for all the help on this one :)

Question by headinmysights    |  last reply

Instructables Build Nights!

Instructables is pleased to present the first in a new series of Thursday Build Nights here at our San Francisco HQ!These are small-group sessions focused on specific projects - you MUST RSVP to attend, as we can only handle a certain number of participants. Registrations will be handled on a first-come basis. We're starting with a bit of craft/tech crossover, and plan to run sessions on a variety of topics.October 2: Intro to Chain Mail with SpiderOctober 23: Halloween open build night.See the descriptions below for details, including things to bring and/or materials fees. To sign up for one of the sessions, simply private message Christy with your name, email, and phone number. We hope to see you there!October 2: Beginning Chainmail with SpiderLimit: 10 participants (confirmed RSVP required)Materials Fee: $10 Start Time: 7pmProject is a European 4-in-1 chainmail bracelet. I'll teach 4-in-1 because it's the most widely useful chainmail weave. Students can use this same weave to make jewelry, armor, sculpture, lampshades, iPod cozies, etc... The materials fee is $10, which covers copper jump rings and clasp, plus the loan of appropriate pliers. I'll bring other goodies for people to look at, and I'm happy to answer any and all chainmail-ish questions.Additional kits and tools will be available for purchase after class.October 23: Halloween Costume & Decoration Open Build NightLimit: none, but please RSVPMaterials: Bring your own!Time: 6pm-9pmWe'll be working on our Halloween costumes and decorations -- bring your work-in-progress along and join the fun! We've got plenty of floor/table space, a couple of sewing machines and other useful tools, and enough skill and imagination to share. It's always easier to get excited about your project when you're working with a group. Please RSVP so we know how much snack food to acquire, and how much of the office to clean up. We'll kick you out at 9pm, or when the last Instructables staff member has to head home.

Topic by randofo    |  last reply