You might find op-amp based active virtual ground, but here a schematic diagram shows that you can build such circuit using discrete components. This circuit uses most any complementary pair of small-signal transistors such as PN2222A and PN2907A. The diode that is used in this circuit is generic small-signal types like 1N914.
You can also use other transistor type as long as you choose from high gain one (al least hfe=100), almost any silicon type will work. Choose one that the current handling capability suits your need. The advantages of this circuit are the parts cost is lower than for any other circuit and has better performance than a simple resistive divider virtual ground. It is, however, the least accurate of the buffered virtual ground circuits. [Circuit's schematic diagram source: extremecircuits.net]
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