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USB Port And PSU


That persistent feeling / memory that stays with one after a profound dream? Personally, I'd rather have the device burn that my laptop, thus I prefer my USB ports to be able to handle higher currents. I won't argue about it anymore, since we're talking about different things. As a result, you might have a device that charges from one port on your laptop, but not from the other.

I have the iihone bose speaker for the house, which has an outlet power cord, but i want to use this speaker i. it will only charge with the wall charger it came with, which is labeled as 2 amp output. You would be better to use something like a LM2596S DC-DC Constant Current and Voltage Adjustable Module, which gives you something like 1.2v-30volts adjustable and up to 5 amps output with Wird geladen...

Convert Pc Power Supply To Usb Charger

Usually there is a sticker on the power supply which gives the maximum current for each line. Whatever is supplying the USB has to be plugged into 120 VAC anyway. Low-quality adapters often either have wacky voltages (too high or too low), lots of ripple (varying voltage), or both. How do they do it?

Mastri, Try using a Yuasa motorcycle battery, or maybe two, strapped together to create the needed voltage, current, etc... My 10 yr old Dell laptop did this when I tried to plug too many things into a large USB hub. One of mine is upside-down, so I always have to remember which one:-) http://www.cardinalphoto.com David Cardinal Yes, that's part of my problem. Usb 12v Does runway 32/33R at Madrid actually have a kink in it?

On the other hand, hook a garden hose nozzle up to the fire hose, and it won't.  pukoh confusing analogy. Usb Voltage Output Yes, my password is: Forgot your password? Unless you seriously know what you're doing, don't open open the case, don't touch the components, don't replace anything inside.

It sound boring, but it's much better than a call devogod My hp stream 8 tablet behaves the same way.

Thank goodness for my Touchstone wireless charging dock for my TP at least. Laptop Usb Output Voltage And Current However due to the popularity of devices charged by USB and their power requirements, manufacturers choose to make USB ports capable of outputting over 500mA, which is not covered by the I didn't see that same issue with any computer/USB ports, but I didn't really go looking for it either, and they eventually fixed the problem. Ask a Question See Latest Posts TechSpot Forums are dedicated to computer enthusiasts and power users.

Usb Voltage Output

Besides the proprietary stuff, Apple offers a pretty good user experience, especially when you need assistance and in store warranty work. http://superuser.com/questions/690074/what-is-the-power-output-of-a-usb-port Kary To further complicate things, there was an Android OS upgrade to the Verizon S4 that caused the phone not to charge at all unless the available amperage was a certain Convert Pc Power Supply To Usb Charger The charging downstream port (USB 3.0) is just a higher speed and more powerful version of the standard downstream port (USB 2.0). Usb Power Supply Circuit or its affiliates

There's only so much current the internal voltage regulation circuitry can handle before it overheats. i gues we now have two ways to turn a power supply on: ps-on to ground or ps-on to pwr-ok. Already have an account? The internal switching transformer wil not be able to cope with the current so you get lower voltage and a hell of a ripple, translating in not a good charge or Power Supply Hacks

  1. or is a completly stupid idea?
  2. The amount of current that is delivered will depend on the circuit board you are powering.
  3. Summary: Higher maximum amperage won't kill your device, but if your device is old and won't accept a charge current higher than 500mA, it's an unnecessary risk to give it the
  4. Watts. (W=VxI) If you try and draw more than 500mA, you may overload the port which will cause it to break Just a warning to look what your circuit needs if
  5. share|improve this answer answered Aug 9 '15 at 7:35 Grandswiss 311 2 Just be careful that the device (and its control circuitry) can handle the extra current! –Andrew Aug 9
  6. http://www.cardinalphoto.com David Cardinal Buffalo came out with an interesting drive that had a capacitor in line so spin-up could be done even on a low power port, then the drive could

http://www.cardinalphoto.com David Cardinal DF-I have to agree that micro-USB is pretty bad as far as the physical connection. i did notice that the Nexus 7 was consuming power faster than the computer could charge it earlier today; it's wall charger can provide 2 amps current vs the .5 of Another possibility someone told me, was to search for a 12V power supply designed for LED lighting applications, but I haven't located any here (I live in Mexico City, and materials Transkript Das interaktive Transkript konnte nicht geladen werden.

Why were there no nuclear detonations in 1959? Usb Power Voltage If you had a 1 amp car charger it simply wouldn't work to provide any current/charge, where prior to the update it did work. There are plenty of other devices that offer the same feature for half the price.

Brad Wood The key is in Ohm's law.

The charger's maximum current will make no difference in this situation. Some of the ground rails didn't work. ncgh Some devices (like my Samsung) will only charge if there is a data connection (inner lines) or the data connection ports are shorted (typical for wall chargers). Usb Charger Voltage For instance, if you have all 4 LED's in series it will require at least 8 V (2 V for each) and that's not a good way to arrange LED's anyway.

You've probably noticed that some wall chargers are stronger than others. Remember that modern ATX PSU need to be turned on connecting the PWR_ON cable (usually green) to the ground. What am I? you can easily find. 5V to 12V boost converter.

I didn't have specs on milliamps or other details about the USB car charging device. It should be fine to use your iPad charger with other USB devices. Also good with our Lithium-polymer battery chargers, so you can just carry a USB cable. If an OEM wanted to, it could program the USB controller on the device to only talk to an "authenticated" USB host/charger.

Explaining laser scanning distortions on water surfaces? BTW Hope you feel like a great big man for replying to a comment from over a year ago with ZERO value add SARodrigues I'd say correcting a misleading reply IS You seem to be saying they won't. 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.