just found this: http://cds.linear.com/docs/en/application-note/an148fa.pdf need to read ... > On 18 Sep 2017, at 22:13, Michael Zacherl <sdiy-mz01 at blauwurf.info> wrote: > > To understand correctly: your question is implying the oscillation only would occur with a signal present at the input, i.e. the ins not tied to ground?