26 Jan
2010
26 Jan
'10
5:32 p.m.
On Tue, Jan 26, 2010 at 11:02:58AM -1000, Joel Roth wrote:
Just to underline that, gain controls are usually
pots
that *attentuate* the signal. The top setting (danger!
ohnoes!) is just letting the signal through with no
attenuation.
That would be true for most mixer faders and
for normal volume controls. But in that case
it's not done as in your drawing, but by using
the pot as a voltage divider:
____
in |
r
r
r______
r out
r
r
____|______
ground
The exception is the gain control in a mic
preamp where the pot is normally used as a
variable resistance (as in your drawing),
but there it is part of the feedback circuit.
There's normally no attenuation in the signal
path (except for a -20dB pad or something
similar).
Ciao,
--
FA
O tu, che porte, correndo si ?
E guerra e morte !