Some of my antenna relays have protective diodes and some don't. If a
power supply were to be used only for switching relays, could the
protective diode be placed at the output of the power supply, rather than
at the relay?
To me, the diode acts more as a protector of the switch or pilot relay
contacts. If the DC power supply has a filter capacitor at the output, the
capacitor will look like a short to the inductive kick from the relay coil.
If there is a regulator circuit, the spike could wipe out some of the solid
state devices there.
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