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Hello, i have a question. I have the iihone bose speaker for the house, which has an outlet power cord, but i want to use this speaker i. A place where the only available power supply is a usb port, is there an adapter i can buy?
How to power nearly anything off a USB port
If you removed the resistor the LED module itself probably has too little resistance to limit the current to a reasonable value. It's Ohm's law: I = V/R where V is the voltage, I the current and R the resistance. If you have next to no resistance then even for a lower voltage, there will be a huge current that will melt the LED module. Choosing a slightly higher voltage and adding a resistor to limit the current as in the original setup should fix the problem.
I have a question that you probably wont answer. I am doing this for some lights I made. the lights used 3xAAA batteries. outputting 4.5 volts. the lighs had a circuitry that resisted the voltage to the LED and on a brand new battery sent 3.5 volts to the led.When i changed this over to USB, it was sending 3.3 volts to the led but the led was overheating and melting the inside of the lamp.why would 3.5 v off a battery not melt the led but 3.3 v off usb would?
good info. Just make sure you are not drawing more current (amps) than your source can provide. Also be aware of the gauge of wires. P=IV, I=P/V
You can remove the car adapter, but remember that this will have a fuse in it to protect the circuit - if you are wiring it direct put in an inline fuse and this should see you right :-)Windy
Assuming your load connection is 12 volts like it is on mine, I would just hook a 12 v auto outlet (cigarette lighter) up to the load ports on your charge controller and plug your usb power strip into it. Otherwise, you will need to get a step down converter which will more than likely be just as bulky as the existing plug. I hope that helps.
sir can I have help ? my laptop usb port don't produce enough power output so even mouse I can't use it all of my port in laptop didn't work i cant copy any file to/from flash drive, when I insert optical mouse it just blink the red light and didn't recognize at all how can i fix this sir thanks.sorry for my bad english
I just connected a 100 watt solar panel to my travel trailer. It has a charge controller, with a "load" connection. I would like to have a usb power strip in the trailer. Using the pictured power strip, I wonder if I can cut off the car adapter and connect the bare wires directly to that load connection on the charge controller. Any thoughts? Thanks...I am completely new at this!
I have an internal medical device, and I recharge it every two days or so, with special batteries. The external battery I use to recharge internal sacral stimulator, sits in a charging cradle, with detachable AC cord. The cord says input, 1OOV, 24OV, 5O to 6O Hz O.4A.Output, 5V, 2.OA. I have portable car battery jump starter, with usb ort that stores 55,OOO (yes thousand} ma. Slightly larger than paperback book. Going on 4 day wilderness trip. is there a usb to the input on this cradle., OR another option would be if USB to AC adapter exists. (Not common ac wall to usb adapter, other way around. Help, asap!
5V at 500mA? Not really. While the port may supply 5V and may be rated as 500mA you can't normally get both at the same time. In addition to normal voltage drops due to cable resistance, drawing a full 500mA usually causes the voltage to sag, enough to fall below the minimum necessary to power 5V microcontrollers.
Mr. Mastri, Try using a Yuasa motorcycle battery, or maybe two, strapped together to create the needed voltage, current, etc... DON'T use a USB port! You'll burn it out... Yuasa and others like it are lead-acid or advanced types of lithium or similar deep-charge batteries that are designed for high current needs... This is what you'll need for any motor-powered device; scooter, etc...
Chris, you seem pretty knowledgeable about this topic. I have a specific question that may seem vague at first. I am looking into purchasing a device that powers usb devices via fire, putting part of the device in heat or flame and it harnesses the energy and charges usb devices. I was hoping that I could use this device to charge a few other things like rechargeable batteries or a laptop or an led lantern, but they do not have the connections to "plug" into the usb port. These devices only have normal wall ac type port. I've been looking around if there are any usb to ac power adapters or converters out there and I'm not seeing anything. Something that essentially is backwards engineered to work the opposite direction, no matter the slow power transfer it may cause. Basically, is it impossible to plug a normal ac wall battery recharger into a device that is meant to only power usb devices? Are there any devices such as this, like the reverse of AC to usb adapter, but for small output and devices? Thanks for any ideas or responses you might have.Myth.
hahahathanks for the laughsucked m right onto this page as wellOne thing tho, you would have to power the usb device to a generator or your neighbors house
what type of circuit is this
what typ of curcit is it
You better off with LiPo battery. Each cell battery has the max voltage of 4.2V. You can google 10 cell lipo or 10S LiPo.
So it seems that if USB is 5v DC 500mA, and I have a device that is rated at 5v DC 500 mA, I should have no problem powering it. But, could I power it with a Universal Power Backup / USB Charger that is rated at 2600mAh ? I am trying to make the device portable, rather than have to plug it in. Thanks ...
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