Digitrex GKX-9000 PSU Improvements.txt part of Digitrex GKX-9000 Digitrex GKX-9000 PSU Improvements.txt, Improvements for Digitrex GKX-9000 PSU. text manual preview

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Change C33 to a 1kV ceramic type.
This protects components on the +3.3V line should C33 (a 50V ceramic) becomes short-circuited through voltage spikes over time.

Add a 1N4751 zener diode in parallel with C2 (Cathode on +ve of C2, Anode on -ve of C2)
This offers additional protection to IC1.