Have your DC as ripple free as possible.

It's claimed that=A0AC on the supply produces thermal cycling which can
shorten life considerably.
I'd have thought that AC at a >> frequency than the device's thermal
time =A0constant should be no great problem, =A0but it's claimed that it
is. YMMV.


=A0=A0 =A0 =A0 =A0R.

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