Rod Stewart posted:The manual has this prophetic statement... "Likewise make sure to disconnect the load before shutting down the power supply."
gunrunnerjohn posted:...Also, the relay drops out pretty quickly, and it appears it's turned off before the power supply caps discharge and let it drop out of regulation.
Rod, is the reason to disconnect the load before shutting down because it might put out some anomaly greater than the set-regulation voltage? What if you lose AC power for whatever reason during operation - like the cat or dog pulls the plug out of the wall socket?
I wonder if the voltage on the power supply caps is really the issue. What is causing the apparent output voltage anomaly on turn on? That is, does the power supply really enable voltage output before the power supply caps are fully charged? I like the relay drop out before the power supply caps discharging...but wonder if it's fast enough!
In any case, I like GRJ's delay-on relay concept...but with possible "tuning" to speed up the relay drop-out time (e.g., reduce capacitance on the step-down, or place a resistance across the relay coil current).
