Warpspeed Guru Joined: 09/08/2007 Location: AustraliaPosts: 4406
Posted: 07:45pm 16 May 2019
Yup, that is pretty much what I was seeing. In my case the required dc was +15v, and under no load conditions would reach about +20v. I just added a 16v zener, and problem solved.
I would probably still be doing it that way if those little Chinese two dollar postage stamp power supplies had not become available.