Dc converter

Do you know any dc converter that step up the voltage from 2 volts to 5 volts?

Thanks for the link but this is a dc usb converter and I need something tiny that in the input enter 2 volts or a little bit less and in the output has 5 preset volts.
My problem is that, i´m using in a weareable project a conductive yarn which has a high resistance and the signal is being deteriorated in a mid-long distance and to drive a transistor I need 5 volt in one of its pin and with his yarn it´s impossible to get it for its attenuation, so i have two options to change the yarn or to search something that step up de voltage.

leibniz81:
... this is a dc usb converter and I need something tiny that in the input enter 2 volts or a little bit less and in the output has 5 preset volts.
... I´m using in a weareable project a conductive yarn which has a high resistance and the signal is being deteriorated in a mid-long distance and to drive a transistor I need 5 volt in one of its pin and with his yarn it´s impossible to get it for its attenuation, so i have two options to change the yarn or to search something that step up de voltage.

Are you possibly using a USB voltmeter module and need to raise the input voltage from the conductive yarn from 2V to 5V?

If not, could you provide a simple diagram, including the part numbers of any ic's you're using?

leibniz81:
Thanks for the link but this is a dc usb converter and I need something tiny that in the input enter 2 volts or a little bit less and in the output has 5 preset volts.

a) That wasn't part of your specification, all you said was "2V to 5V"
b) They're not exactly huge.
c) Use your imagination - USB connectors can be removed!!

(if you're too lazy, just get one without the USB connector installed eg. http://www.ebay.com/itm/370868628527 )

2V isn't an awful lot to work with. You can get smaller ones if you had a little bit more voltage, eg: Power Regulators & Converters for sale | eBay or http://www.ebay.com/itm/360805830632

Pololu makes several very efficient and inexpensive boost regulators. This one will generate 5 V from as little as 0.8 V http://www.pololu.com/product/798

Thanks for all the answer i´m about to order the pololu dc module, I think for its features and size is more suitable for me. i´ll tell you when i receive it.