It was time to submit the power supply to a quick test:
I used a 1:1 transformer to measure the supply noise using this jig I built time ago. The test load was a simple pair of 4K7Ω 50W clad resistors. All wiring was done with alligator clips so induced hum was obviously picked up.
The 50Hz artefact is induced noise from the chokes and circuit being close enough and no shielding was in place for any of the measurement cables. The 100Hz and other byproducts of the rectification is really low below 3mV The overall inband noise is just above 50mV which is mainly the induced noise of the supply being so close to the test load.
So far, so good.
