John Larkin wrote:


Al polys can make voltage regulators oscillate. Tantalums have a nice
middle-of-the-road ESR that makes 7800s happy.

My favorite cheap "MDO" regulator, the LM1117, loves a 10 uF tantalum
on its output.
I've had excellent results using two 22uF aluminum electrolytics, one on the
input, one on the output, of ZLDO1117 regulators. I've built several
hundred devices with that setup, to produce 1.2 to 3.3 V supplies for FPGAs.

Jon