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Any reason I shouldn't use a TL431 as a virtual ground?
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Zero999:

--- Quote from: imo on November 14, 2018, 02:06:56 pm ---If enough headroom you may try with 78L05. Not centered, but it works.

--- End quote ---
The only potential problem with the LM78L05 is it can only source current, A virtual ground typically needs to both source and sink current. A resistor and capacitor connected to the output, will enable it to sink some current, as the cost of extra current drain.
Benta:

--- Quote from: Hero999 on November 14, 2018, 09:05:46 pm ---
--- Quote from: imo on November 14, 2018, 02:06:56 pm ---If enough headroom you may try with 78L05. Not centered, but it works.

--- End quote ---
The only potential problem with the LM78L05 is it can only source current, A virtual ground typically needs to both source and sink current. A resistor and capacitor connected to the output, will enable it to sink some current, as the cost of extra current drain.

--- End quote ---

OP is buffering the output with an LM358. But I like the TL431 better.
iMo:
The 431 can only sink the current, the 78L05 only source..
358 buffer with 2x10k at its +inp could be the simplest solution..
bd139:
Ok I blew up my last TL431 but found an LM385-2.5 in the junk box so have used that. It works nicely with that.

This is driving a quadrature oscillator (and some other stuff I haven't breadboarded yet).



Nice and stable. Works down to Vcc of 5.5V which surprised me.

1V/div. Baseline markers on left.



Thanks everyone for input! Learning a lot here :)
Alex Nikitin:
You may consider the INA133UA .

Cheers

Alex
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