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Placid Stability

I have a Placid BP that works fine on the +rail be the - rail starts at 15V then looses 0.1V every couple of seconds finally bottoming out at around 9V.

From then on tweaking the adjustment pot makes no difference.

Any idea why?

I have had very similar thing with mine...

I just tapped on the trimpot few times with my index finger and ever since all is fine :D