Jim wrote:
>
> Dan:
>      "Mica is somewhat flimsy in the robustness
>       category. I wonder whether it will flake
>       apart under the constant vibration from the
>       motor."
>
> How would this ocurr if the insulator is coated
> in HS compound/thermal grease and securely
> held between the heatsink and transistor body?
>
> I have *never* seen a Mica insulator 'flake' apart
> in use -

I agree Jim, and a lot of DC motors used mica as
the main insulator between the copper commutator
segments on the armature. :o)
-Roman

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