On Sat, 15 Nov 2014 12:42:13 -0700, Nick wrote:

On Sat, 15 Nov 2014 12:38:59 +0000, N_Cook wrote:

I have in my library MULLARD 3P2 FERROXCUBE/PXE/MAGNETS 1971 MULLARD 3P2
MAG.MATERIALS,PIEZO MULLARD 3P2 MAG.MATERIALS,PIEZO 1972 MULLARD 3P3
INDUCTOR CORES 1978 MULLARD 3P4 RM INDUCTOR CORES 1972

what data are you after?

I need the material characteristics really. The toroids are marked
FX1585/D4. I would imagine that D4 is the material.

So ideally...

Mix i.e. NiZn or MnZn?
Initial permeability
Saturation flux density
Loss factor at ? MHz
Graph of complex permeability vs. frequency
Graph of hysteresis loop at 25degC

I have measured the permeability at 500kHz and it's around 830, so I
would guess it is NiZn.

I want to make a transformer with two of these cores that can handle 50V
and 2.8A at HF, so need to know that the cores won't saturate.

Anything you can dig out would be appreciated.

Nick



Assume 1 Tesla, rarely is anything above 2T and sometimes as low as 0.5T,
but if only interest insat, it's a god first engineering pass. It's the
coercivity that will eat you alive here, though.But if you can measure,
you can do all on your samples.