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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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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/ |
#2
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Weird rotary encoder
There is another "wiper" under the normal one that functions for dedenting
into hollows in the diecast bush molding |
#3
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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? |
#4
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Weird rotary encoder
N_Cook wrote:
Gareth Magennis wrote in message news "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 |
#5
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Weird rotary encoder
Ron wrote in message
... N_Cook wrote: Gareth Magennis wrote in message news "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/ |
#6
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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 |
#7
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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 |
#8
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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 |
#9
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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. |
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