Vitually every power supply schematic I have seen positions the power switch between the AC inlet and the power transformer primary. Often times the wire to the power switch must extend a few inches to the front or back panel--along with it a radiating field of lovely hum.
WHY?
Why not put the switch after the filter section, before the load. I see a few benefits... Equipment always plugged in, but not switched on, will benefit from having filter capacitors always'formed', no repeated surges from the power switch that may shorten the life of silicon, and also clean DC flowing through the wires of the power switch so that it could be placed closer to sensitive components if needed.
Is there a good reason not to do this?
WHY?
Why not put the switch after the filter section, before the load. I see a few benefits... Equipment always plugged in, but not switched on, will benefit from having filter capacitors always'formed', no repeated surges from the power switch that may shorten the life of silicon, and also clean DC flowing through the wires of the power switch so that it could be placed closer to sensitive components if needed.
Is there a good reason not to do this?