Weird rotary encoder
 

Mode selector switch on a Boss DD6 effects delay peadal. Looks just like the
other 3 green case subminiature pots each marked B50K , by Alpha. Nothing
external to indicate the 7 posistion "switch" is different. Inside a second
properly molded-in internal endstop as well as the normal one, so track is
limited to 3/5 of normal full track.
So if wiper breaks, due to grease, then pedal has a mind of its own which
mode it wants to be in. When cleaned out measures 0, 3k, 8.1k, 13.4,19k,
25k,30.6K in the 7 positions and over full track 48.6K.

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/

Weird rotary encoder
 

There is another "wiper" under the normal one that functions for dedenting
into hollows in the diecast bush molding

Weird rotary encoder
 

"N_Cook" wrote in message
...
Mode selector switch on a Boss DD6 effects delay peadal. Looks just like
the
other 3 green case subminiature pots each marked B50K , by Alpha. Nothing
external to indicate the 7 posistion "switch" is different. Inside a
second
properly molded-in internal endstop as well as the normal one, so track is
limited to 3/5 of normal full track.
So if wiper breaks, due to grease, then pedal has a mind of its own which
mode it wants to be in. When cleaned out measures 0, 3k, 8.1k, 13.4,19k,
25k,30.6K in the 7 positions and over full track 48.6K.

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/






What exactly is the question you are asking?

Weird rotary encoder
 

N_Cook wrote:
Gareth Magennis wrote in message
...
"N_Cook" wrote in message
...
Mode selector switch on a Boss DD6 effects delay peadal. Looks just like
the
other 3 green case subminiature pots each marked B50K , by Alpha.
Nothing
external to indicate the 7 posistion "switch" is different. Inside a
second
properly molded-in internal endstop as well as the normal one, so track
is
limited to 3/5 of normal full track.
So if wiper breaks, due to grease, then pedal has a mind of its own
which
mode it wants to be in. When cleaned out measures 0, 3k, 8.1k, 13.4,19k,
25k,30.6K in the 7 positions and over full track 48.6K.

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/





What exactly is the question you are asking?



Anyone else come across the like?
Pot used as a mode switch yes, with vague areas around the knob designating
the mode but not ever seen a dedented pot before. And how are they assembled
at manufacture.? Externally there is absolutely no different appearance
between the "switch" ones and the pots, I've looked under an inspection
lamp, no odd dot in the molding or any other difference. If you turn the
shaft then it clicks into the dedents, being the only difference, but that
is not visual.

Detented pots are perfectly common in audio aplications, I can't believe
that you havent come across one before.

Ron

Weird rotary encoder
 

Ron wrote in message
...
N_Cook wrote:
Gareth Magennis wrote in message
...
"N_Cook" wrote in message
...
Mode selector switch on a Boss DD6 effects delay peadal. Looks just
like
the
other 3 green case subminiature pots each marked B50K , by Alpha.
Nothing
external to indicate the 7 posistion "switch" is different. Inside a
second
properly molded-in internal endstop as well as the normal one, so
track
is
limited to 3/5 of normal full track.
So if wiper breaks, due to grease, then pedal has a mind of its own
which
mode it wants to be in. When cleaned out measures 0, 3k, 8.1k,
13.4,19k,
25k,30.6K in the 7 positions and over full track 48.6K.

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/





What exactly is the question you are asking?



Anyone else come across the like?
Pot used as a mode switch yes, with vague areas around the knob
designating
the mode but not ever seen a dedented pot before. And how are they
assembled
at manufacture.? Externally there is absolutely no different appearance
between the "switch" ones and the pots, I've looked under an inspection
lamp, no odd dot in the molding or any other difference. If you turn the
shaft then it clicks into the dedents, being the only difference, but
that
is not visual.

Detented pots are perfectly common in audio aplications, I can't believe
that you havent come across one before.

Ron


Yes but not functioning as a switch, relying on high linearity and
non-variation of resistance for firmware interpretation.

There is a difference to the pots, they are ink stamp marked 2G on the side,
this "switch" one is marked 2H7
http://home.graffiti.net/diverse:gra...net/pot_sw.jpg
Laid out on a clothes peg and mm rule. Third part is the track section
inverted to show the second green endstop. The fourth image unclear in pic,
as buried in the body, holds the dedent wiper. One detent that shows is to
the right of the purple and the endstop arm marked A


--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/

Weird rotary encoder
 

Ron wrote:

Detented pots are perfectly common in audio aplications, I can't believe
that you havent come across one before.

;~)

Graham

Weird rotary encoder
 

N_Cook wrote:

There is a difference to the pots, they are ink stamp marked 2G on the side,
this "switch" one is marked 2H7

Batch code most likely. Taiwan Alpha stick to quite conventional markings for
resistance and curve e.g. 10KA


http://home.graffiti.net/diverse:gra...net/pot_sw.jpg

That's a horrible picture. I can hardly make anything out.

Graham

Weird rotary encoder
 

N_Cook wrote:

Gareth Magennis wrote

What exactly is the question you are asking?

I was wondering the same.


Anyone else come across the like?
Pot used as a mode switch yes, with vague areas around the knob designating
the mode but not ever seen a dedented pot before.

No ? Crikey ! I was using them nearly 30 yrs ago.

Graham

Weird rotary encoder
 

On Tue, 28 Apr 2009 10:06:48 +0100, "N_Cook" put
finger to keyboard and composed:

Ron wrote in message
...

Detented pots are perfectly common in audio aplications ...

Yes but not functioning as a switch, relying on high linearity and
non-variation of resistance for firmware interpretation.

The Alpha 16mm miniature carbon linear pot in Fig. A is supplied in
three flavours -- no detent, centre detent, and 11 detents:
http://www.mouser.com/catalog/catalogUSD/638/683.pdf

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.