The low band version of the Sabin Noise Source from the 2007 ARRL Handbook (Schematic on 25.28)
And from EBay, the Elgenco 602A Gaussian noise generator.
This needed a repair to the power connection. Its output was verified with the ADC_Analyzer software. may need further work on its VRMS meter, but schematics are hard to come by.
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