I need to make a 6.5 vdc - 500ma power supply I have no clue how to make it 6.5v. any help is deeply appreciated
Question by BluTiger | last reply
Aside from it being an ugly hack, is there any reason I can't strip the wire back from the end of a printer power cable and solder it to the plug terminals of a 5v wall wart transformer? This shouldn't be a fire hazard since the power cord should be rated correctly, correct?
Topic by randofo | last reply
Hi all. I have a really old dell laptop(given to me) that is missing a power supply. It requires 20v and 3.5 amps to run. I want to make a digital picture frame out of it. I wont be using the battery or cd player and maybe not even the hard drive(not yet decided). Any idea's on what to use as a power source? I don't need to charge a battery just need power. Could I use an old pcu? I know that I could combine the two 12v lines to get 24 ish volts but won't that fry the old thing? I don't want to buy a replacement power adapter cause it is so old and may not work anyway(plus I wont lie I'm cheap lol). Any suggestions?
Topic by jmiller634 | last reply
OK so recently I have noticed that almost any sort of power can be converted into a different type, sorta. Anyways, it takes power to create radio waves or any wireless wave. Would it be possible to just send out plain radio waves and get something to pick them up and convert them into usable power? Now I know the farther you were from the source, the weaker the power would get, so you might have too send out a fair voltage signal to get some good range. Also, would it interrupt any electronics in range or anything like that? I was just thinking about this and wondering if it is even possible to get actual wireless power around your house or something without using batteries or interrupting anything in your house. Thanks.
Question by noobererer | last reply
I have a battery powered laser on top of a spinning disc. This laser runs out of battery fairly quickly, I need to make it last longer somehow. Could I wire the laser to multiple batteries to make it last longer? If i manage to find a mains powered laser then it spinning constantly wouldn't work as it would have a wire. I ideally need to find a way to power this laser (probably 2 lasers) for most of a day with something that fits on a fairly small spinning disc. Any ideas? Cheers
Topic by happysnail | last reply
What I am trying to do is built a LED board that beats to music. I have found many way to make it beat to the music, but my problem is I don't understand how to power the LEDs. I am new to building electronics, and I am still learning. Anyways, what my hope to do is use build a board 46in long running one LED per inch. This will be dived up into smaller sections to run different beats off my home theater system. I am trying to run all of this using 4 TIP31c, and I understand how to use them, I just am not sure how to power this. Thank you!
Question by Togroovy4u | last reply
I have a 1.2 V nimh battery and a 3.7V li ion (no protection circuitry) battery, which would add up to 4.9V if put in series. However, I want to turn it into a temporary USB power supply (5V) so ignoring all the things regarding putting 2 batteries of different capacities together, is there a way to kick the voltage up a tiny bit? I was thinking something like filtering the output of a joule thief, possibly. I also have a solar panel (4.5V, ???A) and was wondering if that could help, but I don't want to rely on it too much.
Question by .Unknown. | last reply
I want these so badly, and I live relatively close (about 300 miles away).http://cgi.ebay.com/Qty-46-Pulse-Capacitors-7000v-230uF_W0QQitemZ200268515465QQcmdZViewItem?hash=item200268515465&_trkparms=39%3A1|66%3A2|65%3A15|240%3A1318&_trksid=p3286.c0.m14You can make one heck of a capacitor bank, releasing almost half a megawatt in a split second.My only problems:I don't have 1600 dollars, crycry.These things are so large that if I were to line them up side by side (so that the thinnest parts create the overall thickness) it would be 25 feet long, 14 inches wide, and almost a yard tall. THE POWER BOGGLES THE MINDI'm so mad, if I was an adult I'd buy these in a heart beat... sigh... deal of a life time... I hope not...and best of all, they are PULSE CAPACITORSthoughts? comments?
Topic by guyfrom7up | last reply
There is a lot of conflicting information on this and I would like to know if my speakers/amp would get damaged. Using 80w speakers and a 50w amp will there be any problems with running on full volume? And if I got a 100w amp with those 80w speakers will there be damage, even if I added a heat sink to the back where the voice coil is? The speakers say 80w max but not really reliable as they are well priced Chinese speakers. Speakers: 80W Audio Sensitivity: 88dB Frequency Range (Hz): 100-20Khz 4 Ohm Amp: Efficiency: 90% Rated output power: 2*50W+100W Working voltage: DC18V to DC24V The maximum output current: 4A Frequency Response: 20Hz-20KHz Can drive a 3-16 ohm speakers In the condition of rated voltage 24V The sub woofer channel at rated voltage 24V state can drive 2-16 ohm sub woofer Bass cut-off frequency independent regulation 20HZ-20KHZ adjustable Very confusing conflicting info online with under rated amps causing clipping and over powered amps frying the speakers. Originally I thought it was only bad to over power the speakers. Any help about what is worse, is appreciated.
Question by bonze77 | last reply
I think it would be beneficial to create an A/V switcher that has power plugs for each of the slots in addition to the a/v components. So if you select #2 for example, it would power only #2 as well as display whatever is plugged in to #2. Could someone create a tutorial for this? Thanks
Topic by evillordnikon
Hello everyone I have an idea to build a solar power suppl for a laptop using a 12"x12" solar cell. M question is this, if I solder the leads from a power inverter to the solar cell, it should be able to power or charge a laptop correct? Is there something else I would have to do?
Topic by DaMadProfessor | 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
Could someone recommend a dc motor strong enough but @ the same time gentle enough to be used for power assist. The item will be a custom built dolly used for lugging around camera equipment. The total weight will be approx. 50 - 75 lbs. Thank you to those that help.
Topic by sofiadragon1979 | last reply
I want to make an attachment for my bike that generates and stores power when I ride it. I'm thinking of using and old car's alternator, but I don't know much about electricity, so I'm asking for help. Also, how can I store the power? In a battery? I'm planning on hooking up a plug outlet, which might be removable to save space. Thanks!
Topic by jaredsalzano | last reply
Hi Guys! I need some help. I recently got several pc power supplies and I don't know how to turn them on. That sounds stupid, but I don't really work with them much. I tried plugging it in expecting the fan to at least turn on, but nothing happened. No outputs from any of the leads either. What am I doing wrong? Thanks!
Question by transistorguy | last reply
Hi, I have read about technical specification of a thermoelectric peltier TEC1-12726 . The U max =15v , I max =26.3 and Qc max =257.27w. I would like to know about the cooling power in wat(cooling generating). It seems that the power consumption is about 400w. I have heard that thermoelectric peltiers have good and high efficiency. I need some more information about any other powerfull peltiers with high efficiency to build an air condition unit. I need to make sure the power is the cooling power and/or power consumption. I would be so grateful to have some good suggestions and ideas as well. Regards Kevin
Question by sajadi007 | last reply
Another Big Update! We've come a long way since 'How to Build a Qwik-Solar' (Over 9,000 views - Awesome!). Qwik-Solar has now 'grown up' and become the iPower Station, producing more power - with easy to assemble frame kits and complete power packs. They can charge any power pack with a 12 volt outlet and include key safety features (switches and fuses) for worry free use. We've made it one of the best portable solar generators which can be used for cookouts, camping, tail gate parties, and emergency power. For industrial mobile solar power - We've teamed up with McGivern to provide solar Work Pods - with up to a 1,000 watt array! Last, we have Suntigo micro-grid kits for homeowners (with exciting news coming soon on new systems!) iPower Stations are available from 45 Watts up to 85 Watts, with or without a power pack. Find all our solar generators here: Solar Mak And Thanks to everyone that's made Qwik-Solar such a success!
Topic by Jonlo | last reply
I built a PSU bench power supply, but it isnt outputing the right voltages. It just out 5v for all lines(12v,5v). It has a purple wire that is said to be the stand-by, but the psu wont start unless it is connected to the 12v or 5v line. It also says that you have to have the brown sense wire attached to the 3v wire but this seems to do nothing. How can I make this thing output the right power(12v @ 22A, 5v @ 50A)?
Topic by tylerb | last reply
I am trying to design a project for homeless people. I need to attach an inexpensive solar panel to a bag. The panel would somehow connect to a (cheap) battery, storing energy to power a waterproof LED for use in the dark. Is this possible? I have seen waterproof LEDs here. But how about the solar power to battery to LED part? I am electrically-challenged, so make this easy, okay? Thanks a million.
Question by Laughing Whitefish | last reply
I have a strip of LED's that have a warning that's says use only with a 12v class 2 power supply. Is this referring to an AC/DC transformer? Should I be able to run them straight from a 12v battery? If I am using a 12v battery is the class 2 circuitry still needed?
Question by MDheliMech | last reply
Hello everyone, my question is regarding power supply for an Arduino UNO with an Adafruit Motor Shield. I want to use 2 motors that are 12V(link below). I know that the power supply needed should be about 1v more than that of the motor, bu if I want to use 2 motors, do I need to double the voltage of the battery? motor: http://www.abra-electronics.com/products/29DM12V-Single-Shaft-6V%252d12V-DC-Motor.html
Topic by vek11 | last reply
I am relatively new to electronic projects building and I have noted that some projects do not state the power and tolerance of the resistors. How should I proceed, are there any guide lines to establish the tolerance and wattage? Thatnks.
Question by ajax70 | last reply
Normally I'm pretty good with electronics, but I need some help with this problem. I'm building a power supply for a cnc machine and I need help designing a circuit to power fans when it's over a certain temperature. Here's some things it needs: 1) 12 volts supply (easy with a transformer and filtering it) 2) power fans when it reaches a certain temperature. 3) still keeps the fans on even though the rest of the system is off. 4) after the system if off and it's down to temperature then the transformer turns off, to save electricity and to not make it hot after a long time. If possible can someone draw up a schematic? Thanks in advance!
Topic by guyfrom7up | last reply
I have approx 200 flashing LED circut boards that I want to make a twinkling display from. Each board has a single LED that flashes about every second, each board also has a single 3v cr2032 lithium battery powering it. What Id like to do is remove the battery on each one and wire them to a DC power supply that can be plugged into 120VAC. So I actually have two questions: Should I wire these in series? Or parallel? What size power supply would I need? Heres a link to a picture of what I have. http://www.rocketproduction.com/wirefree-leds.php Thanks (in advance) for all your help!
Question by McBeeRob | last reply
Hey guys,So, I just got a Peltier plate, a device that gets very hot on one side while very cold on the other. It requires 90 watts of power. I was just curious what would happen if you powered it by USB or 9v battery. I found this tutorial which uses USB, however, I doubt it gets to its maximum coolness potential. Also, if I used a 9v, would that drain the battery in a matter of minutes, or even damage the plate?Thank you.
Topic by Joe426 | last reply
I have a Gateway 24" LCD monitor, model # LP2407, with a bad power supply. Does anyone know where I can purchase parts for Gateway products? Or does anyone know the company that produces the monitors for Gateway? Gateway is useless, they directed me to companies that are resellers or Gateway's computers. I've checked with several local repair shops, all said, "Good luck, buy a new monitor."
I need to cut the cost of power I consume in my house so I came up with a simple project which I "think" might help but need more assistance. I put together two motors joined with gears so that as one runs, it spins the other. The driving motor is powered by 3v and the other 9v. When I start the 3V motor, it spins and the 9v motor outputs 7v. What I intend to do is run the 3v from a battery, spin the 9v to produce 7v -9v, save that power to the same battery running the 3v and also use the same saved power to run something else. The above is on small scale. I need to do this on a larger scale later on where I can save 12v and use an inverter to produce 220v. Any advice on how to make the above feasible is welcome
Question by nabulomi | last reply
Hey yall! I just recently bought a Raspberry Pi! Those of you who want to order know how hard this is, so Im pretty excited because i didnt think Id b able to order for awhile. Anywho, I wnat to make or buy a portable power supply for it, but I am not sure how to go about doing that. I know there are tons of portable CHARGERS out there for iphones and what not, but I am afriad these will attempt to "charge" my PI, therfore frying the board. Do they just supply power and the device recognizes power being recieved, so it displays charging? And I will be attachin a BUNCH of things via a usb hub to the Pi, so I doubt regular bunch of 4 rechargeable AAs will pwer my device for long with all thse extrra things drawing power. So my question is 3fold: can I buy one of those portable chargers to power my Pi or will it fry it? will 4 AAs be enough to power the Pi and all the extra usb things? and will it be more cost efficient to make a power supply? (I definetely want it be rechargeable, though). Any links to products, or guides to make one would be extremely helpful. Thanks in advance!!! Also, I already have a wall supply, but I need a power supply that is portable.
Question by Adum24 | last reply
Hello All- Big problem here and I'm way stuck. I have a Digital camera that is great however the part where I put in the batteries is bad. Ok so I have a cigg. lighter thing that has a USB slot and wen I plug my camera into it I can power it up in the truck just fine. I can also power it up from the USB on computer. Ok so I ordered a thing from Ebay that takes 4 AAA batteries and its supposed to power up USB stuff. It will not power up my camera. it just turns on then off. Then I went to home depot and they have thing thing called power to go - its also supposed to power up anything USB. Once again my camera wil lturn on then right off again. I'm not getting his at all - maybe someone can tell me why and perhaps help me find somethnig that will work as I do love this camera so much - Thanx for your time
Topic by michaeloshman | last reply