Andy Burns <
[email protected]> wrote:
J. P. Gilliver (John) wrote:
It goes up to 11 (-:
it always has, even on iPlayer
Actually there is a bit of sense to that:
Most rotary switches have 12 click-stop positions so that switches can
be 1-pole 12-way or 2-pole 6-way or 3-pole 4-way or 4-pole 3-way or
6-pole 2-way. If the knobs for those switches are numbered, it is
logical to number them from 1 to 12.
When the knobs are used for volume potentiomenters that have a stop at
the '12' position to prevent continuous rotation, they will only go as
far as 11.
Another useless piece of information concerns the potentioneters used in
the BBC passive mixer, MX18. They were fitted with a 180-degree black
mask with a 180-degree white panel marking behind it, so that their
settings were easy to see at a glance.
If a similar masking system is used on modern pots which have a larger
angle of rotation, it is possible to use linear tracks and load them resistively in such a way that 'wide open' (180 degrees) is about 6dB
below the fully clockwise position. This means that normal mixing uses
the first 180 degrees of rotation in the usual way, but an extra 6dB is available to cope with unforseen circumstances by turning the knob past
its nominal 'wide open' position.
With a passive mixer this also loads down the other channels so that
their level drops by a few dB, which is often helpful in the
circumstances (...if you are used to the pecularities of a passive
mixer and are expecting it ! ).
--
~ Liz Tuddenham ~
(Remove the ".invalid"s and add ".co.uk" to reply)
www.poppyrecords.co.uk
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