I want to know if it is possible to convert something you plug into a wall and hook it up to a 9v battery.
Topic by elizila | last reply
I really would like to try and make a portable tv I am wondering if it was possible I have a decent lcd screen out of a car gps but the only markings on it are vdd , avdd ,vgh ,vgl, pol,vcom, gnd and there are some contacts that say q1 ,q2 ,q3 r0, and c1 I was wondering if somebody could tell me how to connect it to a chip and if it would be possible to make a receiver out of an old VCR
Topic by tong-b | last reply
Hey guys, I've got a set of 5.1 speakers from an old non functional home theater system that I'd like to make into something portable, maybe even able to play sound from an iPod or computer. However, I'm a complete newbie to sound equipment and wiring, so does anyone have any suggestions as to how I could go about that? I know I'm not going to keep the 5.1 effect, but just having a portable system with that kind of power behind it would be pretty cool. Thanks in advance.
Topic by AAdaman | last reply
Ive seen how everyone has made a portable backpack stereo and i think that is a great idea but why not use a regular cd player with all its internals and speakers instead of going out and having to buy a separate amp and speakers and connect it all. I have a cd player disassembled and i want to replace the cd drive with what would be a line in to my ipod could this be done so i can use everything else but the cd drive?
Question by lomn | last reply
Hello, i have a portable dvd player that isnt working right any more. I was just wondering if anyone knew anything cool i can make with it. I just found this site and im really excited! Ton of great things on it. Thanks if anyone has any ideas would be great!
Question by DTWalz21 | last reply
I saw the website of Ben Heck (benheck.com) and I was wondering if it is really necessary to modify the heatsinks for the GPU/CPU and replace the fans. I am planning on making a portable xbox 360 in an alluminum suitcase with the LCD screen from a computer monitor. Is there any easier (legal) way to wirelessly obtain xbox live? What resolution monitor should I get? Any advice?
Topic by MattGyver92 | last reply
I need to power a 12v dc Digital Photo frame in an interior area with no available plugs. I can charge it at night, but need it to be self powered during the day. What can I use as power? I was thinking of possibly a Computer battery back-up or a portable battery used for jump starting a car. Any and all ideas would be helpful. Basically making a battery powered digital sign board. Thank you!
Question by larry925 | last reply
I want to wirelessly power this led strip, is that possible? i also could use a usb, would that work? http://www.amazon.com/LEDwholesalers-Controller-2034RGB-3315-3215/dp/B0040FJ27S/ref=sr_1_4?ie=UTF8&qid=1396659149&sr=8-4&keywords=led+strip
Question by wlhsrobotics | last reply
Hello I am looking to build a portable speaker with some old speakers I found around my house, powered with batteries. I want to know how much voltage my speakers need to work, on the speakers casing it says 5 watts and 4 ohms. Is there an equation I can use to find out what the voltage is of my speakers based on the watts and ohms level? Based on my research it looks like I will need an audio amplifier, can you suggest a cheap and cost effective audio amplifier and leave the weblink on the comments. Please keep the reply basic as in not a tech wizard lol thank you.
Question by RookieSean | last reply
I built a TV from an old laptop screen and one of those LCD control boards you can get from eBay but I’m curious how to go about adding a battery to it to make it portable. So, my question is, how do I go about battery safety and how do I control charging and isolation? For example, if I plug the TV in because the battery is dead, do I just have a charging board between the input and battery and let the charging board take care of the rest? And the same question is applied to when the battery is at peak charge but I don’t want to use the battery just simply plugged in. The battery is a 12v 2A lipo and I don’t want any fires. I’ve thought about adding a switch to simplify things but that’s inconvenient and armature I could make a circuit that would cut off the flow when the battery is at peak I suppose but I’m not sure of the schematics or if that is the right approach. I’m good at building just not figuring this stuff out….
Question by aniox | last reply
I have a Nikon D200 Digital SLR that uses a CompactFlash (Type I/II) MicroDrive and when I'm in the field I take lots of high resolution images that takes a long time to download through the USB port of a laptop. I would like to be able to just carry a self-contained portable hard drive (i.e. 2.5" hard drive in an enclosure) with it's own battery source and just be able to insert the MicroDrive to a card reader connected to the enclosure and download all the images of the MicroDrive without the use of a laptop. A commercial version already exist but they are very pricey like the Epson P-2000. Basically I want the same functionality of the Epson P-2000 but I want the option to use whatever size drive I choose. How much battery would I need to power a hard drive? Would I have to use some sort of circuitry to transfer the images from the MicroDrive to the hard drive with a push of a button? Does anybody already have any instructions on how to build this?? Any help would be greatly appreciated. Thanks
Topic by DickDastardly71 | last reply
I plan on modifying an old bookshelf speaker into a self-powered speaker with iPod Dock, radio and 3.5mm inputs. I have pretty much all of the plans down, but I don't know what would be the best RECHARGABLE power option to use. (That's where you come in :3) I will be using this (http://www.ebay.ca/itm/251137327317?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2648) amplifier board, and it will probably not be used too much (Camping mostly. No more than a few hours a day, and there is electricity on site if needed).
Question by ap1922 | last reply
It needs to be cheap, long range, easy to make, no cameras, portable, and preferably directional and how can i make an emp shield
Question by DELETED_madscientist167 | last reply
On the hunt for software that will allow me to do layout designs for veroboard circuits, however all I've found requires installation and doesn't have a portable version available. Does anyone know of any that has a portable distribution, bonus points if it contains breadboard and PCB sections too. Forgot to mention, Windows user here. Thanks!
Topic by Auraomega | last reply
I am looking for help[ on a posible project. I have a Toshiba laptop that I love. I have a Palm Portable keyboard from an old Palm VIIx that died years ago. I am now wondering if there is any way to convert the Palm keyboard for use with my laptop. Does anyone out there have any ideas?Thanks,Stoff
Topic by Stoff | last reply
I was messing around with some op-amps, building variations of the CMoy amp, etc. But I became depressed quickly -- these ICs' data sheets say that at the safe maximum of 15 volts, they can only pump out around 1/4 watt of power on a single channel! Well, i have a full range driver that really needs more power to sound decent. I was wondering what the normal way of constructing an amp would be if I were looking for 5 to 10 watts of power. *edit*: i'm not looking to run this thing off of batteries... i'm sure at 10 watts, a couple of D cells would get drained rather quickly... I recently cracked open an old 4.1 computer sound system (by microlabs) and scrapped the 5 drivers (4 satellites and a 5 inch sub), two big 3700 uF caps, and two JRC4558D dual op-amp ICs from the amplifier. I read up on the JRC chip (actually, just the data sheet from the RC5448D, the texas instruments flavor, i guess the JRC is discontinued) and it seems that this thing only puts out a max of 200 mW per channel, and typically around 90 mW. Ok i know those speakers didn't get THAT loud without distortion, but i am CERTAIN it was more than 800 mW for those 4 satellites. I am a new computer engineering student, so i can understand the physics behind the electronics, but i am nowhere near the level to start reverse-engineering that amp board. So how did these speakers get driven so hard? THANKS for reading!!!!!
Topic by samurai1200 | last reply
I love videogames. I am going to buy an xbox 360 soon. The only problem is that i want to be able to play in the car, in the backyard, wherever without having to mess with a buncle of cables and a huge TV. This gave me an idea. A modder named Ben Heck (http://www.benheck.com) creates portable game consoles from existing ones. I could possibly use the motherboard and extend the ports, put it in an aluminum suitcase, and use an LCD computer monitor for the screen in the lid. I already have most of the materials I need, but I have a few minor concerns. I don't want the unit to overheat leaving me with a dead xbox. I don't know what resolution LCD monitor I should try to get. And I'd like to know if it's possible to hook up a battery that could power the completed unit. Can anyone give me some advice?
Question by MattGyver92 | last reply
I've come up with a plan to make a potable mobile charger for my galaxy phone with a rechargeable 9 volts battery.My original mobile charger(220 VAC input) says it gives an output of 5VDC at 0.7 amperes and hence I decided to make it with the given ratings.So here's my plan-I'll use a 7805 to regulate the 9VDC from the battery to 5VDC.The 7805 gives a maximum of 1 A output.So here's my question should I use a current regulator(LM317) to limit the current from exceeding 0.7 amps or will the phone's battery draw the sufficient amps from the LM7805?Maybe it might be a good idea to assist the output with a resistor as a safety measure.So,what do you say?
Question by Adarsh_tronix | last reply
Iv been trying to wrap my head around what im trying to do and cant quite figure it out. Pretty much i have salvaged 8 18650 size cells that i would like to run in parallel to make a portable battery. In order to boost capacity, i would like to buy new cells and make another pack that is parallel also. I want them parallel so its a nominal 3.7v system that i can boost to 5v for USB devices I know its bad to run old and new batteries in parallel do to various reasons such as self discharge. My idea is have 2 usb ports for one pack and 2 ports for the other pack and have an input/output protection PCB per pack. Now to keep this more portable i only want to use 1 charger and this is what confuses me. I can charge each pack separately, but that would require me to swap packs on the charger, and i would rather not have to worry about doing that. Long story short, how can i charge 2 battery packs at the same time but keep them isolated from each other? Diodes maybe? Also with how the protection circuits work having the charge leads connected to the output leads and the batteries on there own leads, when the charger is outputting over one amps, will it hurt any device plugged into it or will it regulate the current down to one amp with no harm done? Link to usb charger and protection circuit. http://www.ebay.com/itm/221424010115?_trksid=p2060353.m1438.l2649&ssPageName;=STRK%3AMEBIDX%3AIT http://www.ebay.com/itm/400679842464?_trksid=p2060353.m1438.l2649&ssPageName;=STRK%3AMEBIDX%3AIT
Question by Ksp3cialK | last reply
Hi all, I have built this design with a few modifications to accommodate for the parts that I already have. I used a stereo 1/4 inch stereo jack, but I connected the 2nd signal to the battery negative and the ground to the circuit ground. This way the circuit switches on when I plug in a guitar. I also used headphones only instead of a speaker, so I don't need a switch. Now the circuit works and it is amplifying the sound, except there is a very load hiss. I am assuming that a certain frequency in not being filtered out but this may not matter when using a medium quality speaker because of its low frequency range. However high quality earphones can play this sound. Is this correct? Does the headphone work for anyone with the hiss? Thanks in advance
Topic by geniass
I realized last night when the power went out during a bad storm, that the move to digital TV has elimintaed my ability to watch the incoming weather on my portable TV. I felt blind! Is there a way to get receprtion on that small TV anymore?
Topic by Ladywyngs | last reply
My girlfriend wants me to make a portable battery powered ac outlet for a plug in air freshener (why not just plug it into the wall??) I have searched the Internet, but could find the right idea I'm looking for. I have seen ideas of converting a battery powered item to ac, or a big solar panel ac outlet. Is what I'm wanting to do even possible?
Question by Derek3191 | last reply
Sir, I am really sorry to ask this but i don't know much about electronics but i want to make portable amp for speakers using MC33171 but I don't know which capacitors and resistors to connect to it. Please can you tell me which components i should use. I am gonna use DC current ,around 3.7 to 4.5 voltage. Thank you
Question by harryjone | last reply
Hi, I got The Lenco portable DVD Player DVP-X7. I can hear sound and view the picture on an external device. The problem is that the picture on the screen of the portable dvd player is on the right side and cut of. So only half the picture is visible with a black bar beside its and the rest of the screen is grey. its like the picture have moved to the right and now you can only see a part of it. Please help.
Topic by m8r_vn6oua
I have a portable generator (tiger diesel generator's alternator of 220v 750 watt rated power output) connected to a 1 hp ac induction motor using a pulley-belt system. The rpm of both the alternator of the portable generator and the ac induction motor is 2800 rpm so the size of the pulleys that i used are almost the same. Initially when i bought the generator i tested the output with a digital multi-meter and it checked right.(working powered by the diesel combustion engine). But i have coupled it with the ac induction motor i can only draw out 12 v ac at around 1 amp. I tested this from the same out put plug of the original generator. so I'm wandering what went wrong. Any one have an insight to this I would be grateful for your comments!
Question by nahom.ghawariat | last reply
Since most of my venues are off the road, I need a battery that is not too heavy so I can cart it on foot. My presentations are usually only one hour long. My equipment is as follows: A Sony 2000 lumen lcd projector. On the back plate it says:100 - 240 volts/ 2.4 - 1.0 amps, 50/60Hz. An Armco DVD-DX600 dvd player. On the back it says: AC 240 volts -50Hz -25W An AMPEX AX575MS amplifier. On the back it says: 18W+10W*2(RMS) P.M.P.0.1000w, Impedence 4(OHM) Frequency response: subwoofer amplifier: 20hz-20hz; satellite amplifier 100hz-20Khz; subwoofer speaker:20hz-300hz; satellite speaker 100hz-20khz; separation: >45dB; S/n ratio >75dB My presentations are usually only one hour long. What’s the total current load of my system? What size battery do I need to run this rig for one hour? Do I need a marine battery? A deep cycle battery? Any specific battery you would recommend? Thanks, MamaJoy
Question by Mama Joy | last reply
Question by brandona | last reply
Question by subham19 | last reply
Question by app0 | last reply
Ever since i've seen this portable audio cooler, ( www.addictronics.com/projects/stereo-cooler ), I've always wanted to make one. But unfortunately the person who posted the article never clearly had instructions posted on the blog. I've been looking around for a long time, and have not found other sites that have decent enough instructions to follow along. It has to be able to be powered through a car battery, and the speakers will have to be directly powered through an amplifier or right through the car stereo. I have the specific model of stereo in which i plan to use, and it had a 10 CD changer with it. But I want to use the Radio on its own, as well as somehow wire an RCA cable to it, for use with iPods or other mp3 players. I believe the model is [ KE-2303QR SUPERTUNER ]
Question by dledger | last reply
Question by tejjammy | last reply
Ok I've done many searches but do to this being a bit unique I haven't found a solution thats spot on. So here's the story! I found this cool bathroom, above the sink, multi bulb lighting fixture by the trash. (Oh like you don't shop the same places? He he) I really want steampunk looking lighting for a convention booth I am setting up in march. Tricky part is no power. So, I grabbed the fixture, blasted with a base coat of paint and am posting here for guidance on making this battery operated. Anything is possible I know but in this case I would like a few requirements to be met 1. I'm a maker, and a broke one at that, I don't want to spend $250 on a battery go anywhere plug in device ...its expensive plus if I can make my own I'm happier, mmo cheaper I'm even more happy, mmo with more "found" parts I'm even more happiest! ;-p 2. I'm a lil thing, 90lb soaking wet... I had to hump 120 pound packs w heavy radios back in my USMC days, however I'm not in the corps so I don't want to pack a 120 pound battery thru a convention center for my Lil display. Light as possible battery solution for my light please!;-p 3. I can't use solar at this location, I do have limited space and finally 4. If possible I'm trying to keep this looking nice. This is for my display table. The broke part...I need to make money and that means slick looking booth that people will be drawn towards, handing over their hard earned money for amazing well lit steampunk treasure. I love duct tape, even mentioned it on my dating profile...but it doesn't scream style. Just saying ;-p I'm not surrounded by fellow makers or tools so me chatting ideas out with friends and fine tools isn't happening...so I'm here i n hopes my fellow interweb maker family can help me out here. I have basic electrical knowledge, basic tools, color blind but I think were OK with these few colors here. I took photos to assist the visual and stir creative juices. Mahalo for taking time to read and inspire!
Topic by feeorin | last reply
I would like to use a flat monitor with my wii to make it more portable , would like to use a 20 or 22 inch lcd if possible.
Question by exoticken | last reply
I want to make a portable bluetooth speaker, but I cant seem to find the right bluetooth module. I don't want it to cost too much because I'll probably end up taking it apart, and it has to have low voltage requirements to operate off of lipo batteries. Any help here?
Question by qquuiinn | last reply
I have a one-hour commute on the city bus to work. I would like to work on my laptop, but cannot stablize it in my lap during the bumpy ride. How can I build a small portable tray that can hook to the seat in front of me, with vibration suppression (rubber shock absorbers)?
I have a bunch of speakers lying around, and I recently bought an amplifier kit from Velleman. Specs: Music output: 7W/4ohm RMS output: 3.5W/4ohm or 2W/8ohm Total harmonic distortion: 0.05% (1W/1KHz) Frequency response: 20Hz-20KHz (-3dB) Input sensitivity: 40mV/150Kohm Signal/noise ratio: 86dB (A weighted) Power supply: 8-18VDC/0.5A I have two 8ohm 2W speakers, and two speakers that I can't seem to find the specs for, but it's the same speakers in the picture. I was just wondering if I'd be able to wire up the two 8ohm speakers together and connect it to the amp, but from the specs of the amp, I'm guessing I can't do that? And out of curiosity, what happens when you wire up speakers that don't suit the amp? Also, would 4AA batteries be sufficient enough to power this? And any extra advice/input would be greatly appreciated!
Question by Justin Lam | last reply
I have a portable dvd player without input jacks. I would like to have it use rca ports.
Question by willrandship | last reply