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Topic by kara9865  


Is' that nice

Topic by markjr    |  last reply


L'm trying to sale this pics but i don't know how

Topic by markjr    |  last reply

mA on high intensity LED?

I bought a couple of red "Coast LED Lenser" LEDs from Frys ( They are in the standard 5mm package, but they give no forward voltage and the mA looks a bit high, being without a heatsink . If anyone can tell me if it looks correct and not a misprint, i would be very grateful, since coast doesn't have them on their website anymore. Oh yeah, while trying to light one I ran 8.5V@4.5A (PS2 adapter) accidentally (forgot the resistor) and it exploded loud pop instead of melting or burning out the junction like the 3mm LEDs from ebay, if that helps. The specs.   Intensity :                       10,000 mcd   Directivity:                      15* (degrees)   Operating Lifetime:      Up to 100,000 Hours   Wavelength:                  620nm   IF30:                               mA   IFP:                                 100 mA   VR:                                  5V   PD:                                  120 mW   Topr.:                              -30* to +100* (degrees) I'm guessing the forward voltage would be about 2.00V +/- .20V

Question by LuciferTengu    |  last reply

Electronics Adapter Question about mA

Hi guys I have an electronic device requiring 50-100mA at 5V. I only have an adapter that is rated at 1200mA at 5V. Is it safe to use the adapter? Thanks

Topic by noneother    |  last reply

Help me fix ma zune!

I've got to fix this damn zune, there's no warrenty on it and all in all it's a piece of crap. The guy doesn't care that much if it can't be fixed. I've got shit webcam reference pictures. You'll see that the battery has the terminals connected to a small IC board with 3 solder pads on it, and a voltage regulator of some sort on the bottomside of it. The ribbon cable has 3 little metal spades that solder to those pads on the battery. There's voltage coming out of the pads (I don't have a voltmeter, just a tongue but that works just as good). When I've got the ribbon cable soldered to the battery and I touch the end of it to my tongue I can feel current, so why is it that only once in a while I get power to the zune? Like if I wiggle the cable around sometimes I can get a low battery symbol to come up and then it shuts off. I don't know why it's still showing a low batt symbol because I charged it and it feels like there's a good charge in there so what's the problem? I wanna get this fixed so I can play around with it, no I've never had the pleasure of a zune :p. Thanks guys for anything you can help me with. I was thinking maybe the IC came loose from soldering/desoldering the cable a few times, but it still appears to be stuck on the board pretty good. Well look at the pictures and decide for yourself. It's starting to look like I'll be buying a new battery, which apparently the ipod 30/60 gig batteries are the same size/amperage and can be used in the zune and at a low price of $14, I can probably get a battery that'll last longer than the factory one eh?

Topic by Punkguyta    |  last reply

Adapters to use?

Hi i was instructed to use 5v 150ma power supply, for a device i want to power but i dont have that particular adapter. Can i use an 5v 2A adapter for the device. Is it safe to use this adapter?????????

Question by DeenoH    |  last reply

Need help with a circuit. Answered

I want to make a circuit that lights up 14 LEDs in parallel. The LEDs require 3.2 volts and 20mA each. If I use a wall wart that supplies 9v dc and 350mA, What resistors will I need and how should I connect them? Also can the current blow my circuit?

Question by    |  last reply

FREE DOWNLOAD Anarchy Cookbook Version 2000

Beware, this download can can you into trouble with law enforcement as well as injuring yourself, others and property. Read with care, and use your common sense. There are 219 items, but below is just a selection. Versions of this book have been on various sites on the www for some years. ANARCHY COOKBOOK VERSION 2000 Pictures and Reformatting for Word6 by Louis Helm   Table of Contents 1.Counterfeiting Money 2.Credit Card Fraud 4.Picking Master Locks 5.The Arts of Lockpicking I 6.The Arts of Lockpicking II 8.High Tech Revenge: The Beigebox 27.How to make Potassium Nitrate 28.Exploding Lightbulbs 29.Under water igniters 30.Home-brew blast cannon 35.Phone Systems Tutorial I 36.Phone Systems Tutorial II 37.Basic Alliance Teleconferencing 38.Aqua Box Plans 39.Hindenberg Bomb 41.Phone Systems Tutorial III 42.Black Box Plans 43.The Blotto Box 44.Blowgun 45.Brown Box Plans 46.Calcium Carbide Bomb 47.More Ways to Send a Car to Hell 48.Ripping off Change Machines 49.Clear Box Plans 91.Remote Informer Issue #4 92.Remote Informer Issue #5 93.Phreaker's Guide to Loop Lines 94.Ma-Bell Tutorial 95.Getting Money out of Pay Phones 96.Computer-based PBX 97.PC-Pursuit Port Statistics 98.Pearl Box Plans 99.The Phreak File 100.Red Box Plans 101.RemObS 102.Scarlet Box Plans 103.Silver Box Plans 104.Bell Trashing 105.Canadian WATS Phonebook 106.Hacking TRW 107.Hacking VAX & UNIX 108.Verification Circuits 109.White Box Plans 110.The BLAST Box

Topic by Lateral Thinker    |  last reply

Current switch? Answered

I have some solar panels that produce 3v at 175ma. I was wondering if i could somehow make a switch to have it turn on when the panels are producing at least 100ma. Maybe also a switch for 150ma too :) Any ideas?? If additional voltage is needed it shouldn't be a problem :) Thanks!

Question by astroboy907    |  last reply

How do I start my Arduino going?

Hey guys I just got my Arduino Uno and I'm not exactly sure how to power it up using the jack. I now know that I can run it off of the USB cable but how do I hook a battery to it? I've heard that your supposed to use 5 volts, but I don't see how I can get 5 volts. I only use AA and 3v and 9v batteries. So, also, since it can run off a USB port, I'm assuming I can use my phone charger to hook up the USB to it? Isn't it all 5.1 v? Well, please help me out and tell me if how many volts mA the board needs, which is too much and which is to low.  Thanks guys!!! ~electricloser

Topic by HavocRC    |  last reply

how can i turn a 3 volt current into a 12 volt continuous current to keep a relay switch open? Answered

I am building an r/c tank as some may already know from previous questions, anyway my batteries came in and now i have gone to my local jarcar shop only to find out that the relays i require to run a 12 volt 9 amp current need 12 volts at 150ma to stay open! but the reciever from a toy rc truck can only supply 6 volts for which the motors run off and another 3 volts for which the servo runs off . so how can i amplifie this current into 12 volts continuous to keep the relay open? i know whats needed, the voltage will be doubled but the amphours will be cut in halfe or quarters or whatever the opposit of what is needed to make a 12 volt current. i need to know what it is i need and how to assemble it , i am good with most instructions and im presuming that this should be quite simple and similar to that of a solar powerd sla battery charger.

Question by oldmanbeefjerky    |  last reply

what is a slovent solution thingy ma bobey?

(for science exam)

Question by leo rox ur sox    |  last reply

What gases are producded while maing charcloth?

I wish to make charcloth on my single burner propane stove using a tin can on my patio. My question is....will the gases be of a dense smoky nature so that everyone is calling 911? Or are they going to be of an inconspicuous water vapor so I can carry out the process in my patio without bothering neighbours?

Question by eagles_dare13  

Solar specification for Micro RC Car?

I want to develop micro solar rc car, but I'm confused about Volts and mA on the solar panel.The micro rc car recharge through the remote control and the remote control use 3V (Two AA batteries). So, what Solar panel volts and mA should I use? Thanks?

Question by ample    |  last reply

Will a USB Mp3 player charge with 5v and 88MA? Answered

Will a USB device Mp3 (usually 5v and 100-400 mA) player charge with 5v and 88MA? Will it take longer to charge? Or will it overload the charger and break something? Will a fluctuating amperage, always below the device's requirements, damage the device's LiPo battery?Thank you! I'm going to make something cool!

Question by nepheron    |  last reply

What is the difference between a 6v 80mA solar cell and a 6v 830mA solar cell?

What is the difference between a 6v 80mA solar cell and a 6v 830mA solar cell?I am trying to make a solar phone charger and need to know. Thanks!

Question by DELETED_MakerNinja    |  last reply

Specific output of current? Answered

I'm getting a little more knowledge about current measured in mA, but it's still all confusing. From my understanding, your project draws the current needed out of your battery. If my LED uses 25 mA, then the LED will be sucking 25 mA from the battery. If I have two LEDs, then it would be sucking 50mA from the battery, thus reducing its life. So, based on that, how can wall warts have a specific output of amps? How can a wall wart put out 1000 mA? If you use a project that only takes 700mA what happens to the other 300 mA? What if your project use 1,500 mA? And. . . How do you measure the current being pulled through a basic circuit and your average 555 circuit? Thanks,  

Question by HavocRC    |  last reply

What is the funniest yo mama joke you ever heard? Answered

I need some serious burns. Please help

Question by Bert99    |  last reply

What's the difference between Christmas and X-mas? Or is there none? Answered

What I said above.  Also, if there is no difference, then why do they come up with "X-mas" as a name anyways?

Question by DJ Radio    |  last reply

What is does 200 mA stand for on a power supply?

I am trying to figure out the amps on a power supply. It has an input of 120v, 60 Hz, 4w. Output is 6VDC, 200mA. I just don't know what the mA is.

Question by bbierbaum    |  last reply

Ideas for school X-mas holiday shop items? Answered

Out elementary school has a holiday shop ever year, when the kids get to buy items for their families. (.25-$1) I want to make some items to donate, but I am overwhelmed with ideas. They should be simple, cheap, and should only take 10 minutes (or less)  or so to make each. I can sew, crochet, paper crafts, etc.    Ornaments? Bags? Toys?  Thoughts?????

Question by domestic_engineer    |  last reply

How many mA does an Apple iPod Charger use?

I need to know how many amps the charger cable that came with my iPod pulls. Please help!

Question by ElectroFlex    |  last reply

Bd 241c VU meter from a 100 mA ammeter?

I want to make a VU meter from my 100 mA ammeter with my bd 241 c transistor. Is it possible in an easy way, or I 'm just spending my free time with my doing nothing? :D Please take into consideration that I'm a really beginner, so explain like this.

Question by Gernerakos    |  last reply

How to drop 9 volts to 3 volts at 32 ma

Hello, I am a new B here. I would like to use a 9 volt battery to power lights for my RC car. The led lights operate at 3 volts 32 ma. What size resistor will I need to make the voltage drop. Will this also control the current so I do burn up the lights. The lights are somewhat expensive so would like to get it right the first time. Thanks for anyone's help.papadewey221

Question by papadewey221    |  last reply

Cutting and re-wiring X-mas LED garlands (not strips) Answered

Hi, Has anyone had to deal with cutting LED Christmas garlands into shorter pieces and then rewiring-powering them? What should I keep in mind when doing so? As far as my electrical knowledge goes I should first inspect the voltage which is provided by a standard converter already on a garland and then measure the voltage with the load (garland) on in several spots to determine a single LED voltage drop. Then cut the garland to desired lengths and power it with appropriate converters. Is this right? What I don't understand completely however is the voltage drop. Given that this is a series circuit and the voltage(resistance) sums up - should I add all the single LED drops to find out the total drop and therefore subtract that from my supply voltage to find out the LED working voltage? Oh, and maybe I am simply wrong about the circuit being in series? Thanks! Raitis

Question by Raitis    |  last reply

Local members Brain Drain Cape Cod, MA/RI?

I'd love to make a lot of the things on this site but even more than that I'd like to meet members nearby and share ideas, who knows what could come of it! I'd love to make some friends who are interested in this stuff! If you live on or around Cape Cod or anywhere between here and Rhode Island, post here and let's organize a meetup!

Topic by JollyRott3n    |  last reply

Would this solar panel charge a USB mp3 player? Answered

Could this solar setup charge an MP3 player? I can't see why it wouldn't, but I don't want to be missing something important...? With .275 amps it will charge slower than with .500amps ?(right?) Would .1v and .1amps charge a battery that needs 5v and 5 amps? Would it just be a slower charge or would it not charge at all?

Question by nepheron    |  last reply

How to wire small solar cells to increase voltage?

I need 10 solar cells that each produce .57v and .4 amp to be wired together to produce 5 v and 4 or 5 amp. (Series? Parallel? I just can't understand them very well!)A simple drawing would be the best :)Thank you all soooooooooooooooo muchSolved! Thank you for the help! here is a diagram of my solar charger (from what i learned here)

Question by nepheron    |  last reply

85 LEDs taking 20ma each individually wired with a resistor, what ma power supply is needed? Answered

For 85 LEDs each taking 20ma wired individually with a resistor off of a single 9v power supply I would need at least a 1700 ma power adapter correct??...I would probably go with a 2000ma one though just to be safe.?

Question by lamboboy732    |  last reply

Is there a cheap creation to make a 110v 9-45 mA power system?

I am looking at three ways for this right now. My preferred long game is a solar cell block (minor one, i am not sure of the power output calculator cells have, but along that size I am guessing) that feeds into a digital sine wave form for my output ( low end of power is fine.) I need the sine wave chips to do the build on a +/-110 V wave then, but the ampere I need is ultra tiny by current standards. The total power of this concept is about 1 watt. Perhaps a amp limiter off a wall circuit second as my second but probably easier choice. Reading up on some interesting theories, but to test them accurately, I need this base component(s). I will post the results of what I do with the device pas or fail, as I think it will be important to some of the current over unity power system theories bouncing around to have good well documented answers.

Question by JBrenton    |  last reply

power supply 3V forward voltage 3.2-3.4 20mA. How many leds can i light up? Need a resistor for that, and how many OHM?

I am a really beginner, i want leds in serial, and i can't figure out what resistor i need even with web calculator, i do not even know if i need a resistor please help me!

Question by fsfshsyhh    |  last reply

Would a 18.15 mA, 3.2 V solar cell have a strong enough output to charge 4 1.2 V 400 mAh batteries? Answered

I'm currently working on a project that uses 1 Solar Yard Light cell to charge up 4 SYL batteries and am not sure if the cell, (rated at 3.268 V and 18.15 mA), would be strong enough to charge up 4 SYL batteries. The batteries are rated at 400mAh capacity; Fast Charge Rate is 400 mA; Standard Charge Rate is 80 mA. Also, could I just wire the cell directly into the battery pack or would I have to wire it into the circuit board that came with the solar cell? Any help on this subject would be very much appreciated! :)

Question by BucketBasher    |  last reply

How can I use a 9volt charger on a 3.6 battery 700 mA?

So Im doing this project where I have a 9 volt charger and I need to charge a 3.6 volt 700 ma battery. How would i go about charging this battery? I tried to use one resistor but it got extremely hot, hot enough to melt plastic. 

Question by jnajmy    |  last reply

what if your a kid?

Im a teenager and i dont have any tools

Question by AlexJ08    |  last reply

Design of site?

Hi people. Could you say ma something about site design?

Question by Broneplenka    |  last reply

how do i connect 2 sets of leds that have different volts and mA's?

Ok one set reads current: 20mA suppply: 3.2V and the other reads current: 25mA supply: 3.3V

Question by guy86    |  last reply

I need a diy solution to boost 6V DC to 12V DC @850 mA

I have torroids from pc power supply units, loads of transistors, 555s, uControllers, diodes, caps... all sorts of stuff.

Question by yaly    |  last reply

Artisan's Asylum - craft classes & workshop (hackerspace, maker space, etc.) in Somerville, MA

I'm working with a fantastic group of Boston-area people to get a community craft workshop/maker space/hackerspace,called Artisan's Asylum, up and running in Somerville, MA. We have a small space where we will be teaching classes requiring quiet and clean space, and a big - 9,000 s.f.! - space we are working hard to get set up as workshop/studio (and use for noisy/messy classes). Our goal is to offer tools and instruction in as many craft areas as we can. We already have equipment for sewing, welding, wood working, metal working (we have an awesome CNC mill!), and electronics. Our first set of classes is scheduled and will be starting July 5. You can read the whole list here. A few of the subjects are: Building Art Bikes MIG Welding Introduction to Knitting Introduction to Sewing Clothing Modification Introduction to Robotics Learning by Building the Asylum Arduino for Beginners Advanced Photography We have a long list of instructors interested in teaching different topics in the future, and as our big space gets built out, we will be able to offer EVEN MORE classes at a time. AND BUILD ENORMOUS ROBOTS. Or, you know, small ones. To learn more, you can check out our website, subscribe to our lovely and classic - and low volume - announcements mailing list, or check us out on Facebook. If you have questions, you can leave a note here or email me at jfeathersmith at featherforge dot com.

Topic by jfeathersmith  

Is it possible add mA to solar cells in series/parallel circut if you don't use the same number of cells in each circut?

I had in mind 3 circuts running in parallel with one at 4x2v(8v total at peak), and two other circuts running only one cell each, 2v. The mA of each single cell is at 40mA. Would this circut setup make it 120mA? It would be nice to solar power my airsoft rifle's 6xAA 600mAh(3000mAh total) battery pack in less than 30 hours with only a diode in the circut...

Question by ethereal haze    |  last reply

best way to drive 100 leds? Answered

I was gonna wire them all in paralel so it would use 2,000 ma. run it of a 3 v battery with resistors of course the leds need 1.9 v  @ 20 ma any way the wiring could be easier or how would it be easier to drive all those leds to 

Question by ismael01    |  last reply

Regulated pwr supply using one pwr source to supply 3 lasers w/ diff amounts of V and adjstable mA (info in Details)?

I am working on a multicolored laser unit combining 3 different colored lasers (violet, red, and green) and i would like it so that they can all be supplied with power from one source (such as a AC-DC wall transformer). But each one runs at a different amount of mA's and Volts. I cannot figure out how to get the exact voltages and mA's that i need to run each laser from one power source. here is what the circuit needs to do: --- Use one power source to simultaneously supply 3 lasers with constant voltage and adjustable (using a POT) current. --- Be able to continue to supply constant voltage and current to the other lasers if one is turned off (i dont want the mA or volts to suddenly rise and blow one laser if i turn the other off). --- Use 3 seperate POTs be able to individually adjust the mA delivered to each laser (all of them will run at max mA and if i want to turn down the green i would up the resistance of one of the POT's to reduce the mA flow to the green laser) the 3 lasers that i will be running each have different power specs. below is the max power that i will want to run each laser at. the voltage delivered to each laser this circuit must always remain CONSTANT. the mA's delivered to each laser must be able to be LOWERED from the below specs using a potentiometer or variable resistor. 6V 120mA 4.5V 420mA 3V 340mA If anyone could figure out a circuit or design that delivered these 3 voltages and the same or similar ampages to the lasers from lets say a 12v 1amp power source (it could be more or less as long as i can buy it online), i would be eternally gratefull. i could allways change the resistor and POT values to make the mA's match what i need exactly. I have been looking for somebody to help me out with this and i can find absolutely nobody who knows how to do this. thanks for the time. -Jakob

Question by pianoman2011    |  last reply

How do i determine mA for any given schematic in a book or websitewith parts and voltage only.? Answered

AS a home hobbiest only I have a problem determineing appropiate amps for any given schematic. I dont have a problem with construction just determining propper amps so to be sure of success. tanks

Question by kbyrne    |  last reply

How much electricity is dangerous?

I found plans to make a device to give yourself a static charge using a negative ion generator. It outputs 7.5 kV and 10 mA. I've seen it in use and I know it's not dangerous. I wanted to build two of them together making it output 15 kV. Unfortunately that would also make it 20 mA. I'm not sure what the resistance of the human body is so I guess my question is will 15 kV and 20 mA flowing through a person be dangerous? Thank you for the replies and I'm sorry if this is a stupid question. I'm pretty new to my electronic hobbies.

Question by bruechel87    |  last reply

3W LED Driver

I Want to design a 3W led driver with 9V dc and 350 mA ouput.

Topic by gaurravi11    |  last reply