As people have probably noticed on this forum,over the past few weeks I've been trying to solve a lot of problems caused by using an op-amp with a single supply. Thus far, my attempts have ranged from "almost" successful to not even close. Since I can't seem to solve the problem at the other end, it stands to reason the best way to solve it is at the beginning and try to get a bipolar power supply, thus avoiding all of the earlier problems entirely. But I have no idea how! So I ask the good folk of the E&E OCAU forum: how does one create a bipolar power supply from a single DC rail? I've heard all about charge pumps and bipolar DC-DC converters, but I'm having trouble finding out whether such things would be suitable for my needs - or even possible to obtain as individual parts. Ideally I'm trying to keep cost and size down. Since I'm indending to power a BB OPA2134PA from it, absolute maximum current draw should be no more than 90mA (2x5mA Iq and 2x35mA Io) - and I suspect it will often be significantly less, likely never even reaching 20mA. As referenced in the thread title, the power source will be a standard USB port, meaning a total of 5VDC and 500mA will be available to me (though I should try to keep it under 100mA for compatability). PS I promise this will be my last silly question on the subject of my side-project. If there's a solution to this part, the rest of it should pretty easily fall into place.