6v to 5v convertion for usb

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Can i use a resistor for this? how can i calculate the =D9 required?

USB power is nominal 5V, not 6V...

Perhaps you mean power *to* a USB device? No (correctly functioning) USB hub will provide you with 6V.

To convert 6V to 5V, you'd use a low-dropout regulator. Go to a manufacturer's web page such as TI's here:

...and enter your specs.

---Joel Kolstad

My guess is he probably wants to convert 5V USB power to 6V at 300mA for some widget he has.

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B hub

some

I have 6V 300mA , and I am trying to make it 5V to give power to a USB

thank you all for your answers my friends

A USB what? It might help us to help you if you tell us what actual device you are trying to use. A USB host already supplies power, up to

100mA at power-up and 500mA after enumeration, so at that power level there's not much need for an external power supply. If you haven't got a host, there's not much you can do with USB, apart from light an LED or charge a battery. But if you insist, get a 5V output, LDO (low dropout) regulator. i assume you will be using stripboard or some such to build it on, so something in a TO220 package, say an LM2940, might be readily available.

...or power some really cheesy amplified speakers. ...or a little desk fan. ...or a beverage cooler. ...or warmer!

...etc... it's amazing how ubiquitous the USB connector has become for low-power, logic-level power supplies!

thanks

Actually I have a set of hp flat panel speakers, that I want to connect to another monitor. these speakers take power via a usb connector and the monitor I have has just an output that gives 6v . So I think I must convert this 6V to 5V in order to avoid burning the speakers' USB

Just put two 1n4007 diodes or something like that in series and your speakers should be fine, they can't need that precise a power supply.

Dimiter

------------------------------------------------------ Dimiter Popoff Transgalactic Instruments

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