13 Feb
2010
13 Feb
'10
7:39 p.m.
On Sat, Feb 13, 2010 at 11:28:33PM +0000, Folderol wrote:
Does anyone know where they got that figure of 2122Hz
from? It's always
puzzled me. Is there some arcane mathematical significance, or was it
the work of an engineer with an hangover?
It corresponds to a time constant (RC product)
of 75 microseconds. Now try to find standard
components to make that :-)
The other two are 'round' figures when expressed
as frequency. Corresponding RC values are 318 and
3180 usecs...
Ciao,
--
FA
O tu, che porte, correndo si ?
E guerra e morte !