Low frequency amp? Answered

For a future project (blue barrel infra sub woofer with ducted fan) I'm already looking for parts. I see most amplifiers and amp chips (like the TDA7294) have a frequency response usually 20 - 20,000 Hz. But I'm interested in a range from 0- ca 40 Hz. As far as I understand, the low cutoff is to protect the driver (speaker). Would it be possible to circumvent the low cutoff, or would I have to build from scratch? (I'm thinking in a 70 - 150 W RMS range).

Question by BobS   |  last reply


Quality servos for an low price? Answered

Where can i get good quality servos for an low price?

Question by MACKattacksnipe   |  last reply


New Low-piece Crossbow

I was building crossbows all over the place this weekend, at one moment I had one that was twice as large as the Reaper, but I lacked pieces to make it sturdy. This started out as a low amount of pieces Reaper, but I eventually made it a small crossbow which has about 80-95% of the Reapers power. Although it has the power and probably also the distance, it doesn't have a double arrow trigger(only one arrow) and I don't think it is able to fire properly without trigger. It is however, compared to the Reaper very practical, light and easy to fire/load. Btw there are 4x3 rubberbands on it in pictures. I don't know if I am going to post this one though, maybe if its really needed :P

Topic by Wicky   |  last reply


Periscope

I'm looking for a gaget that will allow me too read book titles of prices on low shelves without crawling on all fours. Hey, I'm 74. I look rediculous in libraries and find it hard to get up. Some sort of a periscope might work, or a traveling low chair to scoot along on and handle to help get up.

Topic by Nina Holland   |  last reply


Help! My low voltage, outdoor lighting wont light up - transformer error codes?

I bought a Portfolio 300watt transformer for low voltage outdoor lighting and hooked up a 100' 12 gauge cable (outdoor rated lighting cable) to it. Then I hooked up 4 low voltage lights (12volt 20 watts each). I plugged the transformer in to a gfi outlet that I ran out from the house. And turned it on. The little display flashes "E" and then "1" . The instructions say that the E means that there is a fire hazard so check the circut. So I unhooked every light except one. Same error. I hooked on a different light and unhooked the first one. Same error. Instructions say the cable needs to be under 250'. And the load less than 300w. I am there, except it won't run. Do I have a bad transformer or is there something that I am missing? Oh, and this is to light my haunt in my front yard, so I am running out of time! Thanks for any advice! Matt

Topic by mckeephoto   |  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


Low cost house building ideas?

Hi Forum. My wife and I have just purchased a piece of land. It was a stretch but the plan is to check out of the rat race once and for all. What we are looking for is ideas, plans, resources, links etc for a DIY home that won't require a mortgage from hell. Any and all ideas greatly appreciated. Also interested in looking at prefab as an option. Thanks. Thoughtfission.

Topic by muddywaters   |  last reply


Does any one know where to get cheap bundles of knex pieces online? Answered

Preferable alot of pieces and new if possible? I have tried ebay but its all used and the box sets are to expensive. Any other sites i can find knex for low prices?

Question by K-Dawg   |  last reply



Low-cost hearing aid for someone old

I know an old person--well, okay, my mom--who refuses to wear an in-ear hearing aid, even though she clearly needs it. For whatever reasons, she thinks its too expensive/too invasive/doesn't want to be bothered, even though Medicaid would probably pay for it etc. Not wanting to be reduced to shouting like I'm on an aircraft deck, I'm wondering if anyone has suggestions as to some sort of inexpensive amplifying device I could rig from some some more or less readily available parts. I'm envisioning something like the old style opera glasses on a long handle, though of course this device would be held to the ear (maybe like the old fashioned ear trumpet come to think of it). This way it wouldn't be too much of a hassle for her. I'm suggesting this arrangement rather than headphones of some sort, which again would isolate her (visually) from the rest of the folks at the old age home. If she could just hold something to her ear when she wanted to hear/converse and then drop it when she doesn't want to be clued in...well, that might be the way to proceed. As usual, low-cost design wins, as I don't have that much to spend. Thanks!

Topic by Dano312   |  last reply


The low-down: Where have I been?

It may be a bit narcissistic for me to think anyone missed me or even noticed I was gone, but for those of you that did notice heres the low-down.Without a doubt, the time I spent working at Instructables last summer was the most fun I have ever had in my life. It was the perfect combination of working among smart creative individuals ( Eric, Christy, Tim, Paul, and Noah), having such an open ended job where I was actually paid to do what I love, and being in bright sunny free thinking northern California. The cherry on top of this summer of awesomeness was going to Burning Man (see pic below). It was something I had wanted to do ever since I had read about it online many years ago, and, as fate would have it, I ended up going the first year I was actually old enough to.I don't think I am ever going to forget driving Tim's manual truck (I don't know how to drive stick) on a deserted road in Nevada, at 3:30 am Sunday morning, the energy drinks wearing off and Tim sleeping peacefully in the passenger seat, while it rained intermittently, with only a vague idea where I was going, and doing this all with just a NY state learners permit. Nor will I forget getting my first sight of the playa, just as the sun was coming up, with all the massive metallic sculptures glistening on the horizion. The week that followed was just pure surreal amazingness. Anything I wrote about my first Burning Man experience wouldn't give it justice, but Tim describes it nicely in his Burning Man instructable.The most surprising thing about the summer though, was that by the end of it I actually looked forward to going back to school. I wanted to learn circuit building and other cool electrical engineering skills that I could incorporate into my future Instructables projects. I wanted to be able to post impressive electronic projects, instead of just minor circuit hacks like the tazer glove and capacitor charger. I wanted to master the movement of the electron.One plane trip from SFO to JFK later, I'm back home. The contrast between Frisco and NY was staggering. If there was one word to describe how NY looked to me at that time it would be "gray". The experience was like watching the Wizard of Oz in reverse, going from the bright, colorful, surreal land of Oz back to black and white Kansas. Don't get me wrong, I love my hometown. I am of the opinion that NYC is the single greatest city in the world (California wins as a state, but in terms of a single city nothing can compare to NY). If you don't agree with me, stand in the center of the Brooklyn Bridge and turn around to get a full 360 degree perspective. Your opinion will be swayed if not changed. Still, September 07 was a very gray month for me. It took me a few weeks to wade through the bureaucratic bullshit of Brooklyn Poly and finally get registered for classes. The classes I did get registered for were all prerequisites and nowhere near my area of interest. I know I am going to have to suck it up and complete them eventually (especially now that my school has merged with NYU, so I get to graduate with a much more impressive degree then the school I was originally accepted into), but at the time I was just too miserable and distracted to pay attention in class. It was even hard for me to respond to e-mails from summertime coworkers because hearing about the activities at the tower brought back memories of a happier time. I was in a state of near-complete mental shutdown, my creativity was shot, and I was depressed. I decided that I needed to take a break from school, so I took a leave of absence for the Spring semester. That leave of absence bought me a time period of 8 months to do whatever I wanted. I figure why not live out my weaboo fantasy, and travel to Japan. I can not say exactly when my obsession with Japanese culture began. Maybe it was subconsciously planted in my brain with the cherry tree in front of my childhood home, cultivated with anime, and brought to fruition when I actually started reading about their history and culture. Whatever the reason, it has been something I've always wanted to do, and what better time to "find myself" then while on a break from college (Its stereotypical-tastic!). There was only one obstacle standing between me and the romantic imagery I had of bathing in hot-springs and meditating in front of Shinto shrines ... money, at least a few thousand dollars of it. Japan aint cheap, and even if I was going to get a job to support me while I was there, I would still need a butt-load of money for the initial travel and living investment. (On that note if any of you Instructablites knows someone in Japan who you could get me in touch with regarding job opportunities or living quarters, or has some advice for living cheaply while there, I'm all ears) I spent most of January half-assedly looking for a job. I did not devote my whole ass to the task because, no matter how much I wanted to go to Japan, I wasn't too excited about the prospect of getting a minimum wage job which utilized none of my skills (I have very unique skills, so finding a job that used them would be next to impossible). It was looking as though my next few months would be filled with minimum wage menial labor. That is until I thought of throwing myself on the mercy of Eric and Christy, and asking for my old job back. I lacked the testicular fortitude to ask them directly, and so reverting to grade school mentality (the one that figures rejection will hurt less through proxy), I asked Tim to test the waters and see if my old job was still available (grade school version: Psst Tim, I've got a crush on Eric & Christy ::school girl giggles:: can you ask if they like me). Tim was kind enough to oblige. A few e-mails later I found out I could come back as long as I promised to return to school in September. (This was no problem because I had already made the same promise to my parents, and myself because I didn't want to loose my 20k a year scholarship).One plane trip at the end of February from JFK to OAK later, I'm back in California. My longterm goal for the next few months is to live as cheaply as possible, learn Japanese, and try to acquire some work that I can do while in Japan. Living cheaply has been easier then expected. I quit smoking (something I thought would be much harder then it was, but after two months of lukewarm-turkey I was able to eliminate my nicotine cravings entirely). I am able to feed myself almost entirely off the excess of others, with the occasional purchased produce being the exception. I bike for transportation (that same yellow road bike in the picture below). I'd say that overall, it took more effort to stop being a consumer-whore then it did to quit smoking, but it feels equally good to be free of both of those bad habits. Well thats my story. I should probably get back to work.New instructables coming soon ...

Topic by Tetranitrate   |  last reply


Low pieces-high range knex sniper rifle? Answered

Is there any low piece-high range knex sniper rifles on this site that have a mag or have a slingshot mech.

Question by thomaswatton   |  last reply


whats the most accurate low piece count sniper ? Answered

Guys im new here but i would just like to know what the most accurate low piece count sniper thanks knex cannon every one who answers in a helpful manner wins them self a free subscribion

Question by knexcannon   |  last reply



Low Voltage, Tube Driven, Guitar, Headphone Amp: 12K5?

I don't have room for a guitar amp right now so a headphone amp is the logical answer. I tried to find a tube driven, guitar, headphone amp but no one seems to make such a thing even as a kit. I don't really have the expertise to design my own circuit but it seems like that's the only way to get one. Would a 12K5 work for this purpose? Basically all I want is a beautiful clean sound I can listen to through headphones and I don't really want to run 200V for the purpose, if I can avoid it. Am I on the right track here?

Question by flagrantfouler   |  last reply


What are some techniques to get low notes out of a bari sax?

Basically, low D and below don't come out easily and often don't come out at all.  Does anyone have any suggestions on what I could be doing wrong?

Question by saxmaster765   |  last reply


What would the cheapest lpa (low pressure air) system be priced (paintball) ? Answered

I'm going to be buying a JT USA Cybrid that operates on low pressure air systems. I need to know what a cheap LPA System would cost. I haven't found a cheap one yet, but I know their out there.

Question by Paintballer98   |  last reply


Why low quality stain odour remover don’t work well ?

Generally we don’t think about the quality stain odour remover for floor or a marble which can easily grab oil, grease, souse, blood  stains, and these type of stains not remove easily by the normal marble cleaner that’s why it's don’t work superior. So what you thing about that type of stain how to remove it easily with or without hard work?

Topic by einsclean 


What is the best youth calibur revolver that has low cost? 500>? Answered

What is the best youth calibur revolver, (So basically lower than .357, I dont care about power much, as long as it can kill a squirrel or rabit, cleanly, and it has little recoil.) and is mainly less than 500 dollars. I've been looking at the .22 (Ruger?) Single Six, (Thats the actuall name, look it up.) revolver. Also, was anyone else but me REALLY friggen suprised there is a .17 calibur? I might loose that under a microsope... my gad, that must be reeeeaaaaaaaallllllllyy small. Like the the size of this "O" in quotes... wow...

Question by PKTraceur   |  last reply


Knex Rifle

I need some recommendations for a low piece, well performing rifle to make.  I just cant find a good one.  I have already built the Sipriani rifle, and it took maybe 5/8 of my pieces without mods.  

Topic by KnexGuy15   |  last reply


gearing Answered

Is low gearing more torgue high gearing is more top speed

Question by chevy62   |  last reply


How do yo do a convincing STABBING effect for a low budget movie ?

Whats the best/convincing way to do a STABBING effect for a movie on a very low budget, less than $1000? The scene calls for someone to be repeatedly stabbed (in some scenes its the chest,others the stomach,back, exct.) with an military/hunting style knife. We obviously DO NOT want to hurt the Actress/Actors so I need to know if anyone out there has any tips or a step by step instructable on how to pull it off? Thank You

Question by wildhero   |  last reply


i am short on pieces. please help me? Answered

I probably have enough to make some thing. I want to build a crossbow but I don't know any low piece usage ones. pleeeeeeeeeeeeeeeeeeeeeeeeeaaaaaase help me!

Question by chopstx   |  last reply


knex rifle?

Does anybody know of a good low piece high power knex rifle?

Question by ooocol22   |  last reply


Why is a bass sound so low? Can I use something like this for a science fair project?

My son has a bass that he loves. He has to do a science fair project for 5th grade. Any suggestion on how he can use his bass?

Question by    |  last reply


I want a powerful and cool looking knex gun but I am low on pieces! Answered

I want a powerful and cool looking knex gun but I am low on pieces! OH and pls make sure it doesnt use yellow connectors.? OH and pls make sure it doesnt use yellow connectors.

Question by ~Z~   |  last reply


What would be a really FUN low piece count knex gun? I'd like for it to have really good range too.

I haven't been playing with knex for a long time, and would like to build a fun, and high range gun. Please suggest a NEW gun.

Question by ~Z~   |  last reply


does anyone know of a good knex M14 Answered

it has to have a working mag and low on pieces

Question by pinderfish   |  last reply


KNEX GUNS SOS Answered

Me and my brother love knex.my brother is 8 and he wants a fort.we dont have much knex.and im stubbern and will ONLY use MICRO KNEX.NOT KID KNEX.I USE THE TYPE I GET FROM ROLLERCOASTER BOXES.back to the subject.i need low-piece microknex guns!I REPEAT:i need low-piece microknex guns.ps a high rate of fire would be nice

Question by TheRoyalJester   |  last reply


3 way light switch push button, working at low voltage controlling line V light

I'm adding an additional light to a room with 2 entrances in an old house. Instead of using the common 120V 3-way SPDT switches to control the light fixture from 2 points, I'd like to use a relay (or something electronic) directly connected to the load of the light, and I'd like to run low voltage wires to push buttons located near the doors of the room. These will control the light by one press = on (if the light is already off), and the following press will = the alternate condition, the light going off. IOW, the push-button will toggle the on/off condition.  There should be a commercially available relay (some kind of latching relay, perhaps) product with the circuit. Can anybody recommend something? Or, perhaps I could put together the components myself. Does anybody have a schematic of something along these lines?

Topic by nehmo   |  last reply


how to make a camera 70mm cheaply?

I want to make a camera with film strips 70mm with low cost and cheaply.

Question by K.S.S.S.V.Sagar   |  last reply


knex rifle search

I am looking for a knex rifle or sniper rifle that has a low piece count and step by step instrutions.

Topic by squiddy412   |  last reply


i have 4 12 guitar cab anyone know if it would increase low end to port the enclosur?

Just wondering because i used to have a combo amp with open back that had way more low end in the distortion it was a crate gx120, now running a Marshall jcm800 4100, just seems like i'm not getting as much on the bottom end any advice would be apprciated.

Question by jesusphreak   |  last reply



Anything simple to make with basic tools, please?

Im 15 and I want to make somthing simple, at a low cost that is also quite exciting. Any suggestions

Question by grazer   |  last reply


Some Health Myths, and why they are mythical....

Cell phones and cancer, the LOW TAR cigarette myth, and the "I'll be healthy LATER" myth - any others anyone wants to mention / discuss ?

Topic by Goodhart   |  last reply



pvc pipe building

Check this site out: http://flexpvc.com/projects.shtml After seeing the pvc stepladder project (one of many projects on this page), I'm temped to make some pvc scaffolding for low height applications.

Topic by mikemckay 


Cheap Eyeglasses - No, it isn't SPAM

Ok, first off, this isn't SPAM - I'm not advertising, just trying to figure something out about this company.Zenni OpticalThey sell glasses starting from $8! Glasses from a local glasses retailer cost around $120, at least! How can they afford to go down that low, compared to other stores? Is it their method of production, like they use different, cheaper materials? I've order 2 pairs off of their site, one regular, one sunglasses. I'll be awaiting the results. Still, it's crazy how low they can go, or how overpriced local stores are.

Topic by Bran   |  last reply


Soundproofing?

How could I sound proof my room? Particularly against the "bass" end of the spectrum? I know you can use foam panels that are cheap enough but would they also help absorb the bass too? I'm getting tired of my parents yelling at me whenever I play music. I don't nessesarily play it loud, but with my subwoofer on, it goes low enough to rattle through the whole house even at low levels. I'd like to make this a competition, the best idea I will pick out and do to my room, I may even think of a prize.

Topic by Punkguyta   |  last reply


What is the name of this music?

Hi, This music was very nice, but don't know what is the name of music.this recorded with a mobile phone.excuse, the music have low quality. Please listen the attachment music. Thx.

Topic by trymusic 


looking for multi- speed quiet wall mount range hood 900cfm for a home

1. any one know where I can get a good reliable easy to clean multi-speed(min 6) range hood with max throughput 900 cfm? prefer    - under $900 with good warranty. most of the time use only 100 to 200cfm    - price include any custom, brokerage, if needed to Alberta Canada 2. baffle or other filter  (I'm new to kitchrn hood, want something easy to clean, low maintenance, low operating cost)

Question by gg89   |  last reply


Whats a good knex crossbow for mods?

I would also like if it had a low piece count cause I dont got alot of knex pieces. I would also like if it was adapted to mods.Thank you!

Question by Maow 


attaching the prosthetic

One of the biggest challenges has been figuring out a low cost easy to DIY way to attach the prosthetic to the child's remaining limb. Please share any thoughts, information or ideas you might have.

Topic by CarliPierce   |  last reply



what should i do?

i just got a new bin from lowes for my knex and i have a bunch of empty boxes now and i dont know what to do with them

Question by knexinventer   |  last reply


need low- tech medication taken/counting device,multiple strands , like a ranger klic bead counter

I have tried many of the sync programs including telephone call in reqall syncing with evernote. i may have to give that i try again, but there are times i don't have my phone /itouch within arms reach, I also have had problems where the syncing in evernote seems off and i need to keep a better count of pain meds,One is an extremely powerful very fast acting buccal tablet.. 5 to 15 minutes for breakthrough pain. Due to the change in pain daily and sometimes extreme breakthrough pain, my cognitive mind is shot and i am still trying y best to keep my daily count accurate, and counting helps me try and lower it by changing my activities. My ability to focus and write has gone downhill.. i have one med i may take 3 times a day at 10mg, or many times try and break it up to more frequent times but same dose, rather than 10mg(2 tabs) at one time i may take 5 and 3 hours later take the other 5 mg, i do this to avoid the side effects of the other meds, so i don't get as sleepy ,lethargic, i have another med i take usually 4 times a day, but sometimes 6 times and difference lucky 3 times.. so i need a 3 to 6 string. Another med i take usually 3 times sometimes 4, and may also break them in half it avoid the sleepiness,, that would be a 3 to 5 beads. i also have another that i may take 1 a day or 8 a day, that is the one that ruins my memory, so lately only taken before sleep, since 30 minutes after taken it , i will forget, and have done things like put the bottle in different places or turned it upside down, but doesn't help wherein i am out. Needless to say mu cognitive mind is very bad. i have plenty of leather and different beads so i have the supplies. i cant figure out how to do it, and since i have million things to do, 2 years behind schedule with a lot of medical procedures that take hours to do. plus need to figure out how to modify equipment so it works better for me. I cant focus on how to make this simple Aztec/Inca counter . I know it is simple, which kills me to ask, but i hate waking up dead. Which has almost happened too many times., i have to get ready for doctors so excuse any grammar errors please. thanks in advance , i lose my pens and papers all the time so that method became unreliable. i figure beads that i can snap on my belt loop would be the best fix.. A bead counter for one strand and i should be able to figure out the rest. i hope  

Topic by escapefromyonkers 


Where can I get a decent Airsoft AEG Rifle for under $50?

I'm looking a decent Airsoft AEG Rifle for no more than $50. I know that $50 is a very low budget, but I only want this for small games with a couple friends in backyards/woods. Low FPS is fine. Only real requirement (besides it being an AEG rifle) is that it doesn't fall apart right as I get it. The only thing I've been able to find is a Crosman Pulse R71/R73, and both seem to have poor build quality, therefore a little over priced. Thanks a bunch!

Question by Gatherix   |  last reply


Poll

Which one should i make? A m16 with some accessories grenade launcher maybe mag and charging handle or a true shotgun w/ mag and pump and should I post my sling shot sniper rifle with my own mech and low pieces

Topic by Katarukito   |  last reply


Should i post this gun????

Should i post this gun???? it will be my first gun specifications: uses low amount of pieces uses a firing mechanism similar to the killerk srv1 firing mechanism, has a good range if you use a small rubberband defects: it is made with small pieces

Topic by gomas211   |  last reply