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Funny Thing, Al, Those Diodes

are Cree SiC Schottky's, which have zero reverse recovery charge. I did a lot of hunting around the circuit looking for noise using a RTA spectrum analyzer and a grounded piece of TI-Shield, and by far the biggest source of noise was the two 1000uF caps associated with the rectifier diodes. You can see in the picture that there are small REL RTE PS caps right next to the shield (also right next to the offending 1000uF caps), and putting a piece of TI-Shield between the 1000uF electrolytics and the RELs made a big difference in noise. Also, orienting the RELs with the outer foil toward the lower impedance side of the circuit made a noticeable difference as well.






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