Mike Rivers wrote:
Mike Rivers wrote:
Sometimes a bad idea or concept gets copied. For example, the new Mackie
and Behringer mixers have gain trim controls that have a 20 dB increase
in gain over about the last 10 degrees of rotation
But what I suspect is that Mackie had the idea for that taper (they've
used it on a number of their products) and Behringer gets the same pots
from the same source and probably never actually gave the taper any
thought.
Eeyore wrote:
No it's simply a standard taper, probably 10C or 15C. They do that.
One of the engineers who I knew at Mackie had the task of specifying the
taper for the gain trim pot. He sent me some spreadsheets of values that
he used for the design. Clearly it wasn't a standard pot, at least not
at the time. That would have been too simple. This would have beein
around 1997 or so. I'm not familiar with the 10C/15C designations. Maybe
it's become a standard taper now that more manufacturers want it
(because more manufacturers want it).
They've been standard for donkey's years. C means reverse log. 10 or 15 refers
to the percentage resistance at the centre point.
Most 'volume pots are' A15s for example. Where A is log. B is linear (JIS
standard)
Page 4 of 6 for example.
http://www3.alps.com/WebObjects/cata.../RK16/RK16.PDF
Other codes are used for more exotic tapers.
Page 9 of 10
http://www3.alps.com/WebObjects/cata...S__1/RS__1.PDF
The W taper suits graphic EQs for example.
Graham