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Any reason I shouldn't use a TL431 as a virtual ground?
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iMo:
And finally four variants with 10mA current sources as "the loads" switched on/off at 100Hz, 1us edges, the upper and lower current source shifted by 2.5ms (such it simulates 4 load situations - 0/0, 0/10, 10/0, 10/10mA). Vbat is 9V, an ideal source.
Zero999:

--- Quote from: imo on November 16, 2018, 11:19:31 am ---And the variant N2:

--- End quote ---
Why not use a single 82R, rather than 100R and 500R in parallel?

Using two capacitors, one to the positive and another to the negative rail makes matters worse, as far as supply rejection is concerned. The capacitors bypass dominate the LM358's output stage and the TL431, forming a capacitive potential divider. Try it again without C2 and C3. The LM358 might also oscillate when its output is connected to such a large capacitance, which is something the SPICE model might not show.
iMo:

--- Quote from: Hero999 on November 16, 2018, 03:10:40 pm ---
--- Quote from: imo on November 16, 2018, 11:19:31 am ---And the variant N2:

--- End quote ---
Why not use a single 82R, rather than 100R and 500R in parallel?

--- End quote ---
For clarity. 100R and 1K have been chosen randomly.

--- Quote ---Using two capacitors, one to the positive and another to the negative rail makes matters worse, as far as supply rejection is concerned..

--- End quote ---
Here you are:
Zero999:

--- Quote from: imo on November 16, 2018, 06:07:59 pm ---
--- Quote from: Hero999 on November 16, 2018, 03:10:40 pm ---
--- Quote from: imo on November 16, 2018, 11:19:31 am ---And the variant N2:

--- End quote ---
Why not use a single 82R, rather than 100R and 500R in parallel?

--- End quote ---
For clarity. 100R and 1K have been chosen randomly.

--- Quote ---Using two capacitors, one to the positive and another to the negative rail makes matters worse, as far as supply rejection is concerned..

--- End quote ---
Here you are:

--- End quote ---
I didn't say remove both the capacitors going to positive and negative. Reread the post.  :palm:
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