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Where to find a small form factor 12v Battery?

I am looking to build an LED light that can be powered directly by a 12v source or use an internal battery. I expect that the fixture form factor will be about 4" in length by 2" to 2.5" in width and no more than 3/4" in depth. Internally, it needs to fit two LED units (each draws 0.1-0.2amps and only one would be on at a time) that are 1"x1"x5/8" each, the inside component of a single pole double throw waterproof switch and the remaining space for batteries. I would like to fit the maximum amount of available capacity as possible in as small a space as possible. I am looking for battery suggestions - small form factor, 12v, preferably available via a regular source (i.e. don't have to be special ordered from China), low self-discharge rate, ability to withstand temperature extremes (specifically 120F-140F degree heat). I'll consider wiring up batteries in parallel and serial to get the charge depth and the proper voltage. Any thoughts? I looked at A23 12v batteries and 2CR-1/3N 6v batteries (wire in serial) but I'd like to find something with more available capacity. Also, I'd prefer a non-toxic battery, but will consider lithium, and the ability to be recharged would be a big bonus. I'm guessing there's nothing out there that would give me enough life to be happy, but I thought I'd ask. Thanks!

Question by kcls    |  last reply


Can some one make this sewer cam?

Can someone make the sewer camera at this link? http://www.dtldeals.com/  It looks really easy.  The only thing I can't find right now is the color camera with LEDs (This is not an IR camera, which are easy to find.)

Topic by jeffpaulwilson    |  last reply


Water dancing in a Speaker

At 6 volts,* the speaker cone filled with water produces standing waves. at 10 v,  maxing out the speaker, water droplets splash up.  i coated the paper cone of 1 speaker with liquid electrical tape to waterproof it.   an identical speaker went unmodified.  water doesnt seem to harm the paper cone. both speakers work with water. when directed down into a bucket of water,  sound stirs the water. * chopped dc voltage from an ordinary ac to dc transformer

Topic by Toga_Dan    |  last reply


4x questions about SMD LEDs.? Answered

Hi ... I would like to ask : 1. how many SMD LEDs I can power from USB (in general) 2. would and USB port handle 90 of these (uk.farnell.com/avago-technologies/hsms-c191/led-smd-he-red/dp/1058373) LEDs ??? 3. Would you rather buy 2pcs of these LED STRIPS (cgi.ebay.com/45-SMD-White-LED-Strip-Lights-Lamp-Waterproof-Flexible_W0QQitemZ370324943281QQcmdZViewItemQQptZLH_DefaultDomain_0) to get the 90 pcs ??? 4. Could I power these 90 SMD LEDs from the strip by USB (after modifying it...'cose its for 12 volts). Thank you in advance, for your answers. Zholy

Question by zholy    |  last reply


How do I get a 7-color LED to just blink continuously?

I'm working on a sculpture that involves LEDs.The basic instructions I've been using come from steps 2 and 3 from this tutorial - https://www.instructables.com/id/Beating-... I'm attaching the leads of the LEDs directly to 3 volt lithium watch batteries. However, I decided to try to use a 7-color blinking LED, and I'm having troubles.The LED packaging says it has "single-color, color-changing or flashing modes." The LED has one anode and two cathodes. When I attach the anode and one of the cathodes, nothing happens, and when I use the other cathode, it cycles through all of the modes in about 30 seconds, and then turns off. The only way I can get it to start again is to take the leads off and start again, but this isn't an option for my project, being as the entire circuit has to be covered in glue to waterproof it.How do I get the LED to just blink continuously? Any help is greatly appreciated.

Question by hezzer    |  last reply


Where can I find an amplifier for this portable sound system?

I am working on creating a waterproof sound system to bring to college. I have already created a 3-d model on Google Sketchup and I have two waterproof full range speakers and one 8 inch woofer. I want it battery powered and would either use a lead acid battery or try to salvage enough Lithium Ion cells from old computer batteries to power it for a long enough period of time. The question though is where to find an inexpensive amplifier that will run on 12 volts, is small, and has decent bass. Does anyone know of some websites on which I could find an amplifier? In the past I have bought desktop systems and converted them to battery power (on the rare occasion that they actually run on 12v dc after the transformer and rectifier), so I know it is possible. Thanks!!! **edit** It seems I forgot to include the specifications of the speakers! Anyway, here they are: 2 - "high fidelity full range speaker", 5" dual cone, "power capacity:30Watts system", 7 oz. ceramic magnet, "4 or. 8 Ohms system" (I measured 3.6 ohms with an inexpensive multimeter), They are on Ebay!! 1 - "Model:  Acoustic Audio MARBASS8 Color:  Black Acoustic Audio 650 Watt 8” Car/Marine Audio High Performance Subwoofer 650 Watts Peak Power Handling / 325 Watts RMS Power Handling Recommended Power:  30 Watts to 650 Watts 2” Parabolic RFL Voice Coil 60 oz. Magnet 4 Ohm Impedance Oversized Butyl Rubber Surround Poly Zirconium Cone Polyimide Voice Coil Former Mid Q Design for Versatility in Enclosure Compatibility Flat Progressive Roll Spider CEA Cooling Technology Vented & Extended Pole Piece Low Carbon Top & Bottom Piece Weather-Resistant Design" This is on Ebay too!

Question by HowToEngineer    |  last reply


What is the best way to power 25 red 3watt LED's and 5 blue 3watt LED's with a 100w LED constant current source driver? Answered

Please excuse me as my technical skills are not as good as I would want them to be :D So, I am trying to build a grow light with this setup: 1. 25 red 3Watt LED's - DC Forward Voltage (VF) : 2.2-2.8Vdc - DC Forward Currect (IF) : 700mA 2. 5 blue 3Watt LED's - DC Forward Voltage (VF) : 3.4-3.8Vdc - DC Forward Currect (IF) : 700mA 3.100W LED Constant Current Driver http://www.dx.com/p/waterproof-100w-led-constant-current-source-power-supply-driver-100-240v-146055#.VRh4f-HkWqg Power: 100W; Input voltage: AC 100~240V 50/60Hz; Output voltage: DC 8~12V; Output current: 8A (label on the box says: 12V 8A) What would be the best way to wire the LED's for maximum efficiency? I'm thinking somehow in parallel, but how exactly? Thank you.

Question by voltskaterzb    |  last reply


LED bracelet inlay

This is my first post so please excuse if I am in the wrong place :( I have a boot bracelet with a leather back and ornate bling glued to the leather and sewn at the edges. I want to add small LED strip lights, weather proof, cutable every 3 lights, double-sided adhesive to the center (between leather and ornate mesh side. I want to be able to turn it  on and off.  I figure 6 mini strip lights should be more than enough.  Here are the lights I have: Features: Superbright 3528 SMD LEDs with high intensity and reliability. 5 Metre strip with 600 LEDs Self-adhesive back with double side adhesive tape. Maintenance free, easy installation Long life of 50,000 hours Flexible strip which can easily be curved around bends. UUltra-bright but running at low temperature Viewing Angle : 120° Input volts: DC 12V This Cool White strip light has 600pcs Double Density,SMD 3528 LEDs The Strip is Customizable for any length you want, Cuttable every 3 LED's without damaging the rest strips, flexible and can be bent at any angle, Works with a 12 Volt Power supply Low power consumption, Eco Friendly, High Quality, high intensity and reliability, High Quality Cool White, Double Density 600 LED's, 3528 SMD 5M/16.4 ft, high intensity and reliability, Long lifespan,   Hopefully that helps.  What I need is a battery source that can be added to the inside of the bracelet that will light it up and allow me to turn off and on (push on/off is better than switch). The source would have to be in something waterproof like a latex substance and can only take up a minimal amount of space 1.5 - 2".  Obviously the batteries would have to lay flat (flat coin-like batteries?) Is there ANYONE out there who can give me ideas?   Thank you!!!  

Topic by harley0805    |  last reply


Battey power supply for a 3528 LED strip

Hi, I am attempting to add this 5M 3528 LED strip to a dress, ideally I would like it to run off a battery power supply as I want to be mobile. I am very new to this LED experimenting, so any help would be greatly appreciated. here are the LED strip description Superbright 3528 SMD Red Green Blue(RGB) LED, high intensity and reliability     Waterproof flexible LED strip     60 SMD Red Green Blue(RGB) LEDs per meter, total 300 LEDs for 5 meters     Self-adhesive back with double side adhesive tape     Maintenance free, easy installation     Every 9-LED cutable without damaging the rest strip     Flexible ribbon for curving around bends     Ultra-bright but running at low temperature     Input volts: DC 12V (12V 2A for 5meters 3528 300LED light strip)     Viewing Angle : 120°     Long life span 50,000+ hours Can I get away with powering it with a simple AA Battery power supply like this: http://www.ebay.com/itm/170470242640?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649 or does it have to be something more heavy duty like this: (and would this get to hot to carry as a power supply on your body?) http://www.ebay.com/itm/12v-10ah-Sealed-Lead-Acid-Rechargable-AGM-Battery-Power-Patrol-SLA1097-/140718332819?pt=US_Rechargeable_Batteries&hash;=item20c3775b93 Thank you for your wisdom and time.

Topic by allofasutton    |  last reply


[vid] Addressable led strips

Greetings; I just finally got my sparkfun led strips working with the fastSPI code posted by Daniel Garcia. Not enough info to post an instructable yet -- What projects would you want to see done with this? I was using just bitbanging to make the arduino spit out the animations in software serial, and it was brutal hard on the processor -- barely had enough cpu to shift out the data, let alone calculate the animation.  Special thanks to the fastSPI code I found the hardware serial can do all the communication work and the processor can concentrate on animating. I will be posting a full ible but need more ideas! From my vid description: Got 64 RGB leds wired up using only 2 spi communicaton wires in excess of 100fps leaving tonnes of cpu overhead room for calculating the animation. *(I have to use delays to slow down the animation or its too fast to see with the eye, let alone capture with a camera) Strip: http://www.sparkfun.com/products/10312 (x2) Waterproof self-adhesive rgb addressable strips. INSANELY bright for 5050 leds. at full white 2 strips draws just under 2 amps/5 volts, they get a bit warm but nothing serious. uC: Arduino mega 1280; I found my duemilenove didn't have the storage capacity for this program. Anything 'uno' or better should do. Library: http://code.google.com/p/fastspi/ Special thanks to Daniel for writing his amazing library. Has support for many types of led strips and absolutely destroys software serial for getting the data out! This is the sample animation that comes with the library to get you started. It took just a bit of tweaking the software and wiring to get it working. Planned projects: Ambilight for computer Midi drum/keyboard visualizer Random party light/vu meter suggestions?

Topic by frollard    |  last reply


[newsletter] Electric Motorcycle, Make Wine, LED Umbrella...

Sign-up for our newsletter here. Apr. 10, 2008 Welcome back! We have lots of news for you today. New contests! Discover Magazine has partnered up for a Green Science Fair For a Better Planet for you eco-makers, and for the bakers we're having a Cake Contest. Enter something awesome! Instructables and RoboGames will be hosting a Robot Contest! If you build robots this is your chance to share your knowledge and show off your bot. Get ready - contest launches April 15! Contest winners announced! See who won the Pocket-Sized Speed Contest, Pets Month, and the T-Shirt Hacks Speed Contest. We will be hosting a Show & Tell at the SF Bay Area Yuri's Night 2008 this Saturday! If you want to show your projects off, let us know!! Check out these cool instructables! Double-Decker Drum Composter Make a spinning double drum composter to make soil for your garden. posted by iPodGuy on Mar 16, 2008 Recycle Plastic Shopping Bags into 'Yarn' Recycle your plastic bags without melting them or releasing noxious fumes into the air. posted by tlmacnolan on Apr 1, 2008 LED Frosties Light up your party's cooler with some waterproofed LED lights. They're simple to make and easy to reuse. posted by fungus amungus on Apr 1, 2008 T-shirt to sexy top Transform a boring old t-shirt into something that makes you the star of the party. posted by diana.cristea on Apr 5, 2008 Take a Picture of the Steam from your Meals Learn a few tricks for capturing that freshly-cooked look in your photos by reading this Instructable and the helpful comments. posted by Brennn10 on Apr 2, 2008 Cool prizes from Discover Magazine! April is Photo Month! Bake and decorate! Electric Umbrella Turn an ordinary umbrella into something whimsical and magical. posted by sockmaster on Apr 8, 2008 How to Make Wine Making wine is easy to do with the right stuff, equipment, and proper sanitization. posted by Seakip18 on Apr 8, 2008 Turn broken speakers into a snappy media cabinet Broken speakers are pretty but useless while media cabinets are ugly but useful. A melding of the two objects was all but inevitable. posted by GoodRubbish on Apr 7, 2008 $5 Macro Lens - for land or sea use Make a cheap macro lens for a camera with no built-in macro feature. Fit for use above or below the waves. posted by Warthaug on Apr 2, 2007 How to build a 72 Volt electric motorcycle No gas, no oil and almost silent. 72 Volts, 70mph, pure fun. posted by Stryker on Apr 8, 2008 Now go make something awesome, and I'll see you next week! - Eric

Topic by fungus amungus    |  last reply