5 watt LED

Hello, forgive me if this is not the right blog to post i was just not sure where to ask. i have a 5w led that came off a flash light i would like to either do my own flash light or install it in my house as a light, how can i do that and what do i need to power it, the only thing i know about the flash light is that is a 5 watt. also i dont know much about leds so if you guys can help that will be really cool. thanks

Posted by Nelson_Yepez 7 years ago

LED help!!

Hello, forgive me if this is not the right blog to post i was just not sure where to ask. i have a 5w led that came off a flash light i would like to either do my on flash light or install it in my house as a light, how can i do that and what do i need to power it, the only thing i know about the flash light is that is a 5 watt. also i dont know much about leds so if you guys can help that will be really cool. thanks

Posted by Nelson_Yepez 7 years ago

resistors and watts

I know how to use ohms law to calculate what size resistor I need but what I really need to know is how to tell/calculate what watt rating I need to use whether it be 1/4, 1/2, 1/8, 1,10 and so on.

Posted by pattyshaw 6 years ago


I was out buying the parts for the free electricity from telephone port in wall, but the resistors have no wattage posted. The man at the electronics store said he needs the wattage for the correct resistors.

Posted by 3l3ctr1cman 10 years ago

Airbrush compressor TC-20, how many watts???

Hi guys, i recently bought a mini compressor for cake decorating. Its a "ABD TC-20" and i bought it at TCPglobal. Problem is, i dont know how many Watts it uses! You see, i bought it as a pressent for my wife. "Nice? Yes!" "Bought with my nose and not my brain? Yes! Im living in Holland, and our network works on 220volt at 50Hz. The compressor i bought works on american standerd, 110volt at 60hz. So i need a converter to make the machine work without frying its circuits... If i buy a converter specificaly for this machine, it has to have the right amount of Watts. i know, i can buy a converter that handles Watts in the range of 1000Watts, cuzz more watts on a converter is better, but than i'd have to buy one thats quite expensive. Because if the compressor only uses, lets say, 50 watts, i could buy one that has a max of about 100 / 150 for a waaaay lesser price than the one thats more powerfull. It would be 50EU for the smaller converter against 200EU or more for the bigger one. So, if you happen to know something on this subject, i would be more than happy with any info you've got ;-) greets! P.S. At the moment i wrote this, the package is stil on its way from america to my house. So i dont have a box or machine sticker to sneak the info i need from...

Posted by AriedeB 5 years ago

SSR and a hotplate

Dumb question. Have a heating plate that uses 1100 watts and runs on 120 volts ac. if 1100 watss / 120 volts = more or less 10amps, Could I safely use a 10 amp rated ssr aka solid state relay or use something higher.

Posted by Computothought 3 years ago

1 watt Frequency Doubled Violet Laser

I want to make a 1 watt violet laser, by using a 1 watt 808 nm laser and channeling the laser through a KTP crystal. Judging from my humble knowledge of second harmonic generation, That should create a 1 watt violet laser beam. Correct?

Posted by Nexoid 7 years ago

20 watt PA amp transformers.

Today I bought a 20 watt PA amp at a garage sale for 5$, and there were 2 big transformers in there. Any ideas of what I could make?

Posted by mrbubl3s 7 years ago

50 Watt LED Wired To DC/DC Converter

Hello, I want to wire a 50 watt led to run off of 12 volts.                                                                                                                                   here is info on components:                                                                                                                                                                                    50 watt led                                                                                                                                                                                                           forward voltage:30-36 Vdc                                                                                                                                                                                  forward current: 1750-3000mA                                                                                                                                                                                                                            DC/DC converter:                                                                                                                                                                                                  input volts: 12DC                                                                                                                                                                                                      output volts: 48DC                                                                                                                                                                                              output current:3A                                                                                                                                                                                                Can I use resistors to make this work?                                                    

Posted by flatfish 4 years ago

Free Radio Berkeley ~1 watt PLL xmitter

Hiya, I was wondering if anyone here has put together the FRB "1 to 1.5 Watt No Tune PLL Transmitter/Exciter"?? I have some questions...

Posted by nak 11 years ago

100 watt LEDs

Hi there I am wanting to drive 5 100 watt Cool white LEDs at half power total of 250 watts. Each LED spec is 32-34 volts DC @ 3.5 amps. Ideally I would like to drive from one power supply. or 2 at most, any advice would be welcome. please email me at tn21@live.co.uk

Posted by JohnT10 3 years ago

Tweet a Watt now works with Google Powermeter

The Tweet-a-Watt is a cool hack that was made by Adafruit (Limor Fried and Phillip Torrone). It would tweet your energy usage from one outlet so you could be more aware of how much juice you're pulling through the lines. Now you can connect it with Google's Powermeter and get some nice graphs of your energy usage. Hit the link for more info and get the code to do it yourself. Tweet-a-Watt now works with Google Powermeter!

Posted by fungus amungus 8 years ago

Set of dome tweeters (Too high wattage)

I have a set of dome tweeters that ran grwat on an old amp i had, thing blew out a few years ago, and just barely runs through another amp with the crossover and woofer. there is some jumpers in the crossover that say Tweeter attenuation -4dB stock setting --- -2dB 0dB Just as i put it right there. I want to know what attenuation means and how i can use the same amount of power into the tweeter, but make it louder. (It's pretty quiet.) Right now it is set at -2dB. Except the dB and numbers are lined up.

Posted by Yerboogieman 9 years ago

12 Volt 5 Watt Solar Panels- $19.99

UL Solar has 12 volt 5 watt solar panels for $19.99. I bought a couple of these about 2 years ago. The price has not been this low since then.     http://www.ul-solar.com/5_Watt_12_Volt_multicrystalline_solar_panel_p/stp005p.htm Luxstar is not affiliated with UL Solar.

Posted by luxstar 5 years ago

9 volt battery to power 5 watt tube amp

I searched for so long for the internet to answer me and nothing i want an inverter that will take a 9 volt battery and power a 5 watt tube amp. the amp is handwired, there's no circuit board and i want to believe its possible

Posted by ethan.heil 5 years ago

100 watt sub woofer amp

I'm looking for or to make a 100 watt amp, I can't seem to find any. If you know where i can find one online or a schematic to build one please let me know! Also is it possible to resist or lower the amps from an amplifier or will I have to specifically get a 30 watt amp for the mid range speaker. I am attempting an "led music box on steroids" project hahaha.... basically what I am going to do is make a clear plastic box and put leds and speakers and a 6" sub in it. Kinda bored and looking for a fun project and this came to mind. I'm open to any suggestions to make it better or ideas on how to power the speakers. Thank you in advance! The sub woofer I'm looking to power http://www.electronix.com/100-watt-woofer-speaker-ohm-p-13521.html and the mid range speaker http://www.electronix.com/30-watt-midrange-speaker-p-13507.html Might think about putting a tweeter in too

Posted by zcm87 6 years ago

Speaker and Amplifier Wiring Please Help!

As you can see I have a car amp and some speakers, can anyone with speaker or amp knowledge please tell me (or even better draw a diagram :D) of the best (most efficient / loudest) way to wire all these up, the specs are as follows… AMP 2/1 channel amplifier Max power – 400 watt 4 ohm stereo – 2 x 75 watts RMS 2 ohm stereo – 2 x 100 watts RMS ROUND SPEAKERS (midwoofers) 4 ohm 25 watt RECTANGE SPEAKERS (tweeters) 4 ohm 4 watt Thanks for your help! (P.S my plan is to build a portable sound system powered by a car battery)

Posted by superrob 6 years ago

DC to AC Inverting for boat

This spring I am looking to build a pontoon boat from scratch (Besides the pontoon logs). Its going to be a large boat and I am wanting a few amenities to go along with it. Im trying to figure away convert the car battery wich is on the boat to power appliances such as mini-fridge, lights, radio, box fan, and maybe a PS2 with Television. I need a high wattage out-put to power everything too. For sure: 8 lights - 75 Watts ea. 20 inch tall Mini-fridge - 200 watts Stereo - 150 watts Box Fan - 120 Watts Maybes: PS2 - 180 watts 20" Television - 300 watts I want this to work if all the for sures were going at once. I want to know how many car batteries I will need approx for 10 hours (or longer) of use with the "For Sures" And I want a clean way of doing this. Any advice would be much appreciated!

Posted by d_child 10 years ago

LED Fixtures

I need instructions on how to construct an LED system with remotely located 1 watt fixtures with the furthest fixture being 50' from the power source I'll need to drive at least 10 of the 1 watt bulbs. Thanks for any help 

Posted by zappenfusen 8 years ago


I need to create a Dummy load of 50 amps at 18.5 volts DC so I will need to dissipate 1000 watts, was thinking of using 10 x 100 watt 100 ohm resistors from EBAY will that work, there are others at 4 Ohm etc, what ohm should I use?

Posted by TrevorP55 1 year ago

Help wiring an LED array

I'd like to buy some LEDs off ebay and build some LED arrays but I'm confused as to how to wire it. For example, lets say I have 100 watts of LEDs (aka 1 watt x 100 LEDs or 10 watts x 10 LEDs) as an extreme example and each LED has a max voltage of 12 volts. Then lets say I have a power supply that provides 100 watts at 12 volts. How would I wire it? I'm worried that if I hook it up, lots of LEDs will just burn out. Just help me understand what I need to watch out for here. I'm obviously a super novice. Have pity.

Posted by WillE2 3 years ago

LEDs Driveway Solar Setup

Help with LEDs (2 Part Question- Answer what you can) I got a reel of 5 Meters SMD 3528 Epistar LEDs Power Source: 12 Volts DC Wattage: 60 Watts Power Consumption (W/m):18 Watts / Meter LED Chip Model: SMD 5630 LEDs Number/M: 60 pcs / Meter How many Amps needed in a charge controller? Solar Cells Average Power (Watts): 2.6 Wp Average Current (Amps): 5.2 Imax Average Voltage (Volts): 0.5 Vmax Do I need to wire the solar cells 3 in series to reach 15.6 volts (Calculated loss so not 12v) and then parallel to reach 60 watts for the LEDs? (I plan to have around 70 watts just for incase and rely on the charge controller to lower voltage to 12V.) ------------------------------------------------------------------------------------------------------------------------ (I am using a standard car battery. An old one that has lost a lot of juice, but I tested the LEDs on it and it still works.) Is this okay? Am I doing things right? Thank you all for your help!!! :o)

Posted by Learning Exp 3 years ago

Testing 3 Watt LED's

I recently purchased 13- 3 watt LED's. I'm trying to establish a high out-put LED light. I also purchased a LED Driver Transformer 48 Watt 120 Volt to 12v DC 4 Amp. First I would like to test each LED using the same divider. I'm thinking that if I create a voltage divider two 330 ohms to limit the current and reduce the voltage to about 6 volts that would allow me to test with the driver that I purchased. Secondly, will this driver be enough to drive all my LED's and would I have to reduce the voltage down too since it appears to push out enough wattage and amperage for the total number LED's I'm putting together? I'm building my circuit based on this video. http://www.youtube.com/watch?v=4qYZahe2s5o&NR;=1 Link to website data of 3 Watt LED. http://ledsupply.com/indusstar-1up.php Assistance would be greatly appreciated. Regards, 

Posted by lancruz 7 years ago

This is how to blow an amp

Try hooking a 1200 watt sub up to a 75 watt POS amp. It lasted for like 20 seconds and something blew and it all shut off. The sub is still fine though but damn now I need a new amp :( Any ideas? I wonder if I could build myself one?

Posted by Punkguyta 10 years ago

using 1 watt LEDs with a 4017

I want to build a chaser type light array using a 4017 counter divider circuit, 555 timer and the ever popular 1 watt luxeon LEDs, but I don't think that the 4017, or the 555 can withstand the current that will be going through them. I know in most cases you can simply toss a heatsink on the component and it will be fine, but I don't know if this will work with the ICs. https://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?langId=-1&storeId;=10001&catalogId;=10001&productId;=12749Here is the spec sheet for the 4017. Thanks

Posted by John Culbertson 11 years ago

LED 3 Watt Testing

I recently purchased 13- 3 watt LED's.  I'm trying to establish a high out put LED light.  I also purchased a LED Driver Transformer 48 Watt 120 Volt to 12v DC 4 Amp. First I would like to test each LED using the same divider.  I'm thinking that if I create a voltage divider two 330 ohms to limit the current and reduce the voltage to about 6 volts that would allow me to test with the driver that I purchased.  Secondly, will this driver be enough to drive all my LED's and would I have to reduce the voltage down too since it appears to push out enough wattage and amperage for the total number LED's I'm putting together?   I'm building my circuit based on this video. http://www.youtube.com/watch?v=4qYZahe2s5o&NR;=1   Assistance would be greatly appreciated.  Regards,

Posted by lancruz 7 years ago

I bought some nice Technics speakers..well..

I'm gonna bug people once more, but this should be an interesting question for all. I bought some nice Technics SB-A53 tower speakers yesturday, they sound pretty good. Google it or look at the picture below, 260 watts each.Here's the question:Seeing as these speakers are rated for 260 watts EACH, thats 520 watts all together. My surround sound amp outputs 110 watts for each channel, this is JUST fine for how loud I listen to things (most of the time =) but I need to "test" them, I'm being serious here. I get up to -5db (thats what the volume units are on this unit) and it still isn't as loud as I KNOW they go.Here's my idea, the amp has a B channel specifically for a second set of "front" speakers, If I were to connect the left and right channel of each speaker channel together (the negative and positive leads together, not all together, but seperatly together). Would this get me 220 watts per channel? Or just make some drastically horrible sound?

Posted by Punkguyta 11 years ago

High Power LEDs

I have 3 10 watt LED emitters to sell (2.9 cm x 2.0 cm x 0.3 cm) Colour temperature is about 6000K I'll ship anywhere in Australia I don't have a good quality camera right now Send me a private message and I'll see what I can do

Posted by .Unknown. 6 years ago

Help me to make a led panel

Hello guys.. I want to build a led board for my planted aquarium... the total watt requirement is 84 watt.. so I decided to add 16 5watt 12 volt smd led chip... but I hv some confusion about the circuit.. plss help me to build the board.. its urgent...

Posted by আহারেব 6 months ago

LED Power consumption ?

I'm building a solar powered lighting for a farm, what will be the power consumption for a 10 white led.

Posted by yousaf65 8 years ago

How do I manually turn on a computer powersupply??

I want to turn my old 480 watt computer power supply into a bench power supply, but I have no idea how to turn the thing on without connecting to the computer. The power supply is a 480 watt Reactor. I heard there is a standby 5v, and will turn on full power when you give it some logic input. Please post. Thx

Posted by GoodAtIt 11 years ago


I am making an inverter whivh converts 12 V dc to 230 V ac i am using 2 33 ohm resistor of 1 watt to connect the load on transformer whenever i switch on the ckt the 1 watt resistor are heating to much and multimeter does not show any voltage i am using 12 Volt dc 2.5AH battery as power supply what is the problem

Posted by AbhishekR2 3 years ago

What's the Difference Between Watts, Amperes, and Volts?

I always find this really confusing. Also I have a MotoMaster 12v solar panel supposedly for a car or something from Canadian Tire but I got it for electronics projects. I can get a voltemeter to detect voltage coming from it but I can't get it to work a motor or light or anything. It has two normal alligator clip leads.

Posted by Aeshir 11 years ago

Need Circuit Diagram for 5 Watt 12v LED Connect to 6v 5Ah Battery

Hai Friends, I have 5 pieces 5 watt led's. Led Specifications: Model - 5 watt, Forward voltage (VF) DC 9 - 12v, Forward current  (IF ) - 900MA, Output lumens  - 800 - 900LM, Color temperature -  6000 k, operate voltage - 9v to 12v DC I want to connect these Led to a 6v 5Ah Battery. (Used in emergency lamps.I want to replace the old tube light in the batteries and replace with these led's.) I need the circuit diagram for the project.With Low and high Brightness modes.Please help me. thanks in Advance to those people, who are going to help me completing this project....

Posted by jinto1729 3 years ago

Post your speaker systems here!

What kind of speaker system do you have? Doesn't matter if it's computer speakers or concert stacks :p Me: -Kenwood 1060vr surround amp 110 watts per channel - 550watts -Technics tower speakers, twin woofer mutual effect system, 230 watts each Mirage nano sub (canadian made) with ribbed foam surround (clean sounding!) - 300 watts I still have yet to get the rear channels set up, but it's useless without the remote as you need it to turn the surround channels on *has pissed off look*. Anyone have a kenwood 1060vr remote??

Posted by Punkguyta 11 years ago

Need a 30 watt "LASER"

Looking for an inexpensive laser cutting/engraving system. I will be taking it apart and  customizing it to fit onto another machine.  Currently, we have a rotating blade to cut sheets of material, but this set-up causes many issues.  A contact free solution would be best.  So I want to mount the laser carriage above the cutting area; the rest of the laser parts will be contained in a metal cabinet under the machine.  The laser would need to be able to travel 12-16 inches in 1-2 seconds and cut through 1-5 mil paper/poly material. I have a fair amount of experience with lasers, I have know how to sight them in and understand the technology.  We currently have 45, 100 and 400 watt galvo head lasers, as well as a 90 watt XY laser set-up. So, what website would you direct me to, to purchase an inexpensive laser system?

Posted by benjaminleebates 3 years ago

resistor Q

I'm building an LED circuit and I have the right ohm but the W is 1/2 when 1/4 was calculated out?

Posted by mrshow555 10 years ago

Required Power Supply for Peltier (TEC12715)

I'm going to build a Mini Airconditioner based on Peltier Module. I'm going to use 10 Peltier Module for better cooling. 1 Peltier requires Umax (V):15.4 Imax (A):15 Max power consumption (watt):231 Watt. Which Power Supply Driver is required to run all 10 Peltier Elements. [I am from Non-Electrical Background].

Posted by Karthiie keyan 3 months ago

[ask] Blinking led advantage

Hi all, i want to ask in order to use less power (voltage, current or watt, i'm confuse about that) to light led. If i power up 100 leds blinking in parallel, blinking one by one, 50 hertz or higher, Am i get kWh (kilo watt hour) lower value instead powering 100 led without blinking...? Thx

Posted by shinjiyuubix 8 years ago

Crate GT15R Personal Lead Amp 15 Watts with Reverb

I have a brand new Crate GT15R 15 watt amp for sale, I bought it to use with my cigar box guitar, but have gotten too busy to play much. I've only used it about 5-8 times, it works perfectly.This rugged amplifier combines outstanding features with serious clean and distorted sounds. A Reverb control is provided for greater flexibility. RCA input jacks allow connection of a CD or tape player for playing along with your favorite music, and the Headphones jack lets you practice in private.I am asking for $85I will set up the sale on Ebay, pay with paypal.PM me please.

Posted by bumpus 9 years ago

Energy with Seesaw system

In this sketch you will find that I have attached 10 shake flashlights on  the both side of a balanced seesaw system and this seesaw is moving with a 6 volt motor but  I have used 10 no. shake flashlights and each flashlight will produce only 2 volt as a output which will be less than input . On the first hand each flashlight is producing only 2 volt and on the second hand the total 10 no. flashlights systems are producing 20 volt . If we try this concept than input is more than output but if we add total output then it is greater than input. please answer me that will these flashlights will be light up or not as mass is not an issue in this device. Note(1)each flashlight is separate with another flashlight . (2)to move a balanced seesaw there is need of less energy or input. These flashlights are mounted permanently ,horizontally on the both Arms of a seesaw(making+ symbol and view my sketches) and this seesaw will move side to side just 2 to 4 centimeter only.remember we will only shake the only one arm of this seesaw with corner and flashlights will not slide as these are mounted permanently on the arm of this seesaw. suppose if a flashlight require 10 watt power to glow up then we will have to apply 20 watt so that so that this 20 watt input could also counter some mechanical loss also.but this 20 watt input will be sufficient to glow up these 10 flashlights as all flashlight are permanently attached on this seesaw so each will shake with equal force or applying force will be equally distributed in these flashlights..in other words we are giving 20 watt input and out put is 150 watt with these 10 no. flashlight.we can do it with our hand power to test it to shaking the seesaw.

Posted by vikram_gupta11 1 year ago

Resistors are too warm

Hello,I am building a multi-touch surface using the FTIR method and after the surface is powered for about 10 minutes there is a heated smell in the room, I have noticed that the resistors are very warm and that a couple have started to brown or burn. I really need this table to be able to be safely powered at least 18 hours a day.Here are my specs:LED's:I am using 88 Infrared LED's (T 1 3/4 INFRARED LED, http://www.allelectronics.com/make-a-store/category/340250/LEDs/Infrared/1.html )--8 LED's per series--forward voltage of 1.5v --forward current of 100mAResistors:I am using 2, 10 ohm 1/4 watt resistors parallel (so 5 ohms) with each of the 11 series'Power Supply:The power supply output's 12 volts DC and 1.2 ampsWhen I calculate using http://led.linear1.org/led.wiz it says I only need 1ohm 1/4 watt resistors, I haven't tried this yet but it doesn't seem to me that this would rectify the situation. My guess was that I need 1 watt resistors, but the calculator didn't seem to agree.Any thoughts as to what my problem is? is it safe to go with 1 ohm 1/4 watt resistors? or do I need 1 watt resistors? Any help would be very appreciated, thank you!

Posted by hapticdata 9 years ago

Need advice to find 12V dc/ac schematics

Hi, Im looking for schematics for a Chicago electric - 2000 Watt / 4000 Watt Peak Power inverter part number 95596 from harbor frieght. i did search there site with no luck, and i could use it asap. Or if you some advice about how I should go about repairing it, that would be great. It simply will not power on. TY in advance for your help :)

Posted by intheshed123 7 years ago

Customize product that uses 4 - 6 watts 120V AC to run on DC

I have surfed this site for a LONG time now and have never posted a question so this is my first...!!! I have a product that I am trying to customize a little but i need some help.,.. The product uses 4 - 6 watts at 120V AC and it plugs into a regular polarized plug... I am trying to make it run on 12V DC but I really don't understand how to do this or the conversions involved.... I have build a 12V 1A circuit but how can i safely make this product use this circuit...??? If it can run on DC power how many Amps will it use...??? Thanks for any replies and I am really looking forward to making this work if at all possible...!!!

Posted by SummitSeeker 6 years ago

Math help needed for converting volts/watts in solar

Here's what I know: Watts (P) = Amps (I) x Volts (E). What I don't know is if I have a solar panel that is rated at 12v, 0.125 mW I can do the above equation to get that my amps are 0.01. Does that sound right? My real Q, is what is the best power battery to store this energy? Should I only use 8 "D" cells? Could I use a 12 v motorcycle battery? If I use Ni-Cd batteries, is the fact that the batteries are rated at 2500 ma make any difference? Is there a website where I can get a good feel for what batteries are good for what type of activity, solar cells, etc? thanx, sam

Posted by wanzie 7 years ago

ultrasonic cleaning machine

What is the output voltage of 100 watts with 40khz frequency and 220 input voltage generator of home made ulta cleaner for having greatest efficiency?

Posted by mehran1376 1 year ago

LED indicator

How should I drive an LED from a 38 volts power supply? The led wizard says I need a 1800 ohm, 2 watt resistor, but it also says' it'll disipate excessive heat. I recently took apart a surge protector and found that they drive an LED from a 120volt source by having a diode, LED and what appears to be either a 1 or 2 watt resistor. I need help driving an LED from a 38 volts power supply just as an indicator.

Posted by guyfrom7up 10 years ago

New Light Fitting Smells Of Fish When Hot

Hi, I have just fitted a new light fitting. After it gets hot (60 Watt filament bulb) The room smells of fish. I believe that the smell is coming from the hot plastic, probably from the plastic that holds the shade in place. I don't want to reduce the wattage, The label on the connector says it is rated for 100 Watts. How can I get rid of the fish smell? Thanks

Posted by anon_private 2 years ago

Wiring your LED

So I just built a new garage and I want to make my own LED lighting for my work bench. I was looking at 1 watt luxeon leds and I was wondering if I need a resistor with those leds? I was looking on ebay and it said that the driver is already installed? I will run these with a PC power supply rated @ 800 watts will this work? Can anyone guide me thru this? Ive been looking on here and reading as much as I can... Thank you.

Posted by BeachKid 9 years ago