Here's what I have and here's what I need: I have a 12v source of virtuall y unlimited current (car battery). What I need is a way to easily and chea ply produce plus and minus approximately 5 volts (not critical) at about 3 amps for an automotive application. From here I have to drive an op amp to produce say plus or minus 3 volts to drive a transducer with will require a t least 2 amps at full swing. I can do this by buying DC converter modules , but at this current level they're pricy. Doing some checking, I've come across "rail splitters", something I've never dealt with in almost 40 years of repairing electronics.
Any advice appreciated.