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Two things became very clear to me once I got into the detailed testing of the project: I have completely stuffed up the grounding and layout of the components.  In particular the Switching Regulator has a convoluted route back to Vin -ve and the route it does have takes it right under the sensitive components (until I bodged in a couple of wires).  Layout is too far apart for many components, including the bypass and decoupling caps, and non-conducive to managing noise.  There a ...