Virtual Ground 

TL Serices Virtual Ground or matching Resisotrs Single Supply Virtual Ground Chip TLE2426 Application Notes  20ma That device is a virtual ground maker. T hat is, it creates a reference point half way between the rails. Y ou would supply your op-amps with 24V and Ground and use t he output of this device as your signal/analog ground. TL081 Dual Supply Buck Conversion Pricey                                                        5v bipolar ___ __ TL LOW Z Balanced
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