Custom toroidal PSU +/-48V enclosure buzz..

[Eliani]

Ian, I did not, I gave the ratings I needed on the secondary side...

 

[Odk1]

Hi everybody,
I'm new in the forum.
I was looking for user manuals about the ATI Pro6, and just found you topic.

If it can helps, you can look at the built of the Pro6 I took.
I saw that the toroidal transformer is surrounded by something metallic I think...
Take a look!

Greetings

 

[rock soderstrom]

I guess it is something like this:

https://www.don-audio.com/trafo-shield

 

[Cranehazard]

+1 on the torroid sheild toroids still emit tons of stuff. Rotate it for least noise also.

 

[davezawadi]

You say high-frequency noise, not 50/60 Hz. Looking at the circuit I think you might have an unstable regulator, they need rather more decoupling than you have with short leads on both input and output to the setting pin. I assume you don't have an oscilloscope, so try an extra 10uF low ESR capacitor on each end of each regulator. If it is 50/60 Hz (I don't know where you are) the DC voltage into the regulators may be too low, It should be about 55-60V DC. I am concerned because your circuit has 50V capacitors! In fact 44.6 from the transformer is too low as well, the winding should be 48-0-48V RMS but you will probably get away with that, assuming you have 44-0-44 volts (which you should check!).
Good luck
David CEng