Varnishing a transformer will not affect the heat dissipation, it is common
for many high frequency transformers and all line transformers, air is a
poor heat conductor anyway. The noise of a ferrite core transformer can be
came from loose assembly between core and bobbin or a loose winding, if the
two EE cores are fixed by tape only, noise will also be generated between
the two cores.
C.H.Ling
----- Original Message -----
From: "Julian Davies" <julian_davies@xxxxxxxxxxxxxx>
To: <olympus@xxxxxxxxxxxxxxx>
Sent: Saturday, October 18, 2003 6:15 AM
Subject: Re: [OM] Re: [OT]Transformers (was Noisy T32 (wax potting))
> Yes, drilling ferrite cores would be a neat trick! My guess would be that
it
> is the entire coil bouncing as a unit on the core. A few loose turns on
the
> coil won't usually produce too much additional noise, assuming that they
are
> neatly wound (which may well be an assumption too far, of course)
> Where I would be concerned in covering the entire coil with shellac or
> similar is that this will rapidly impinge on the heat dissipation of the
> coil, which is already marginal (hence the overheating issues on rapid -
> firing sequences), so go sparingly.
>
> Julian
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