1°) I can't find that "special lacquer", that's designed for coils. Is there something else I could use to prevent the coil from whining and that I could find easily ? Nail polish ? Glue ?
Well I read you could try wooden toothpicks between the windings - didn't work for me. Also I tried an epoxy glue 'coat' - also didn't work for me.
3°) I have a non-PFC PSU at home, and it doesn't have a coil, or at least, not such a big one. Could it be that this coil is related to PFC ? I'm just wondering.
I would stake a large sum of money it is a choke for the PFC circuit.
- My FSP 300-60BT has one of these (bolted and now grommeted to the lid of the psu case) - I never could silence it so retired the psu to one of my noisier systems.
- A Jou Jye psu I got had active PFC: instead of the large choke it had a daughter card with several components including a coil on a donut ferite core that buzzed. This is the one I tried to sort (without success) with toothpicks & epoxy. Fortunately the psu blew up and I threw it away.
- A Mercury (aka Deer) passive PFC I have also has the large choke mounted on the psu lid as per my FSP. I have also failed to silence this one.
- My current psu is a Powerup (aka Deer) with no PFC, and is silent
In my experience PFC costs money as well as noise - I hope I have to eat my words at some stage in the future but (on the noise front) I am disillusioned with PFC! But hey, hopefully someone else here can enlighten us how to silence these damn things