21 Oct
1999
21 Oct
'99
2:56 a.m.
ard(a)p850ug1.demon.co.uk (Tony Duell) wrote:
>
> Incidentally the nominal Vff is given as 6.3V. I wonder how many
> modern-day engineers would realise the significance.
Well, I'd assumed that f stood for filament.
___
Hey, perhaps Vcc is cathode voltage!
This is the point that zeners change from avalanche
to
some other kind of break down that I can't remember
the name of. These made good noise generators.
Or, could you be talking about filiment voltages?
Dwight
I was taught, avalanche breakdown above 5V, Zener breakdown (of course) below,
but I'd always assumed that both mechanisms were present around the changeover
point.
Philip.
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