Back in June my NZXT PP-800 desktop supply failed and I bought a cheap
chinese replacement, which works but its putting out some intense RFI, mostly 20
to 30 over birdies on the 160m band and some on 80m.
https://www.ebay.com/itm/334616637902I bought some RF beads online:
2673000101
Fair-Rite ferrite shield bead. 73 material, 25 ohm @ 10 MHz, 35 ohm @ 25
MHz. 0.137" (3.5mm) O.D. x 0.051" (1.3mm) I.D. x 0.127" (3.25mm).
and opened the PS and aimed to install them on the leeds of the switching transistors
as I had seen this done in other designs I have worked on in the past.
This supply used (2) of these:
https://pdf1.alldatasheet.com/datasheet-pdf/view/1140733/JINGDAO/P13009.htmlSo I went and put a bead on the base of 1, and the collector of the other hoping to hit
a bullseye. After its all back up and running, still have the intense birdies, freq shifted a little.
The only other components I could apply them to seem to be T0-220 packages with I believe dual diodes
in them, but not sure if I have the best type of bead, os would it be more properly placed somewhere else
in the design?
The NZXT supply never produced any birdies or RFI, but its way more packed with more complex circuits
and I guess a more expensive PS would be worth a try but I know ferrite can probably cure this.