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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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On-Off-On vs. On-None-On .
I'm looking at the Mouser Electronics catalog, at DT rocker switches,
and I'm wondering what the difference is between On-Off-On and On-None-On . The second is used much less, but, suprisingly, it's used in the same section, from the same maker, as the first is used. A guy on the web says ""On-None-On" indicates there are only two rest positions, making one connection or the other. " but again, the same maker will have many other DT swtiches marked On-Off, so that's a little hard to believe. Or is that false too, and None means the middle position of the switch is not connected to the neon light in the switch, but Off just means the other loads aren't connected? I'm also wondering if there is a difference between On-Off-(On) and On-Off-Mom ? Is the second a new category for Mother's day? That's today, but I'm pretty sure this catalog was printed years ago, since i've had it for years. And again, Mom is used much less, but when it is used, it's the same maker and the same section where (On) is used. If one maker uses both terms, it seems like, in both cases here, they might have different meanings, but I can't think of any. |
#2
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On-Off-On vs. On-None-On .
On 5/14/2014 3:42 PM, micky wrote:
I'm looking at the Mouser Electronics catalog, at DT rocker switches, and I'm wondering what the difference is between On-Off-On and On-None-On . The second is used much less, but, suprisingly, it's used in the same section, from the same maker, as the first is used. A guy on the web says ""On-None-On" indicates there are only two rest positions, making one connection or the other. " but again, the same maker will have many other DT swtiches marked On-Off, so that's a little hard to believe. Or is that false too, and None means the middle position of the switch is not connected to the neon light in the switch, but Off just means the other loads aren't connected? I'm also wondering if there is a difference between On-Off-(On) and On-Off-Mom ? Mom is spring return. Is the second a new category for Mother's day? That's today, but I'm pretty sure this catalog was printed years ago, since i've had it for years. And again, Mom is used much less, but when it is used, it's the same maker and the same section where (On) is used. If one maker uses both terms, it seems like, in both cases here, they might have different meanings, but I can't think of any. |
#3
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On-Off-On vs. On-None-On .
I raised this issue sometime last year. The terminology can be confusing.
ON-OFF-ON means the switch has three positions. In the center position, none of the contacts is closed. An ON-(none)-ON switch is a regular DPDT switch. It has no central third position. Does this make sense? |
#4
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On-Off-On vs. On-None-On .
"micky" A guy on the web says ""On-None-On" indicates there are only two rest positions, making one connection or the other. " but again, the same maker will have many other DT swtiches marked On-Off, so that's a little hard to believe. ** "On-Off " indicates the switch has two contacts ( per pole) instead of three. .... Phil |
#5
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On-Off-On vs. On-None-On .
On 05/14/2014 05:53 PM, William Sommerwerck wrote:
I raised this issue sometime last year. The terminology can be confusing. ON-OFF-ON means the switch has three positions. In the center position, none of the contacts is closed. An ON-(none)-ON switch is a regular DPDT switch. It has no central third position. Does this make sense? Da |
#6
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On-Off-On vs. On-None-On .
"mike" wrote in message ... On 5/14/2014 3:42 PM, micky wrote: I'm looking at the Mouser Electronics catalog, at DT rocker switches, and I'm wondering what the difference is between On-Off-On and On-None-On . The second is used much less, but, suprisingly, it's used in the same section, from the same maker, as the first is used. A guy on the web says ""On-None-On" indicates there are only two rest positions, making one connection or the other. " but again, the same maker will have many other DT swtiches marked On-Off, so that's a little hard to believe. Or is that false too, and None means the middle position of the switch is not connected to the neon light in the switch, but Off just means the other loads aren't connected? I'm also wondering if there is a difference between On-Off-(On) and On-Off-Mom ? Mom is spring return. As far as I have always known, so is (On) ... Didn't we have this discussion on here a few months ago ? I seem to recall that we didn't reach any firm conclusions except that the terms for switch configurations that we have all known for the last 100 years or more seem to be changing for no real reason other than the whim of certain manufacturers ? Arfa |
#7
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On-Off-On vs. On-None-On .
"William Sommerwerck" wrote in message ... I raised this issue sometime last year. The terminology can be confusing. ON-OFF-ON means the switch has three positions. In the center position, none of the contacts is closed. An ON-(none)-ON switch is a regular DPDT switch. It has no central third position. Does this make sense? Rather less than the 'proper' designation of SPDT or DPDT that most engineers know and understand ... :-( Why change something that had perfectly well understood meaning, for something open to debate and needing interpretation explanation ? Makes no sense at all to me. Arfa |
#8
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On-Off-On vs. On-None-On .
"Arfa Daily" wrote in message ...
"William Sommerwerck" wrote in message ... ON-OFF-ON means the switch has three positions. In the center position, none of the contacts is closed. An ON-(none)-ON switch is a regular DPDT switch. It has no central third position. Does this make sense? Rather less than the 'proper' designation of SPDT or DPDT that most engineers know and understand ... :-( Somebody must have decided that all toggle switches should have a designation for the "center" position -- even if it doesn't physically exist! |
#9
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On-Off-On vs. On-None-On .
On Tue, 3 Jun 2014 02:06:22 +0100, "Arfa Daily"
wrote: "mike" wrote in message ... On 5/14/2014 3:42 PM, micky wrote: I'm looking at the Mouser Electronics catalog, at DT rocker switches, and I'm wondering what the difference is between On-Off-On and On-None-On . The second is used much less, but, suprisingly, it's used in the same section, from the same maker, as the first is used. A guy on the web says ""On-None-On" indicates there are only two rest positions, making one connection or the other. " but again, the same maker will have many other DT swtiches marked On-Off, so that's a little hard to believe. Or is that false too, and None means the middle position of the switch is not connected to the neon light in the switch, but Off just means the other loads aren't connected? I'm also wondering if there is a difference between On-Off-(On) and On-Off-Mom ? Mom is spring return. As far as I have always known, so is (On) ... Didn't we have this discussion on here a few months ago ? I seem to recall that we didn't reach any firm conclusions except that the terms for switch configurations that we have all known for the last 100 years or more seem to be changing for no real reason other than the whim of certain manufacturers ? Arfa I suspect that really crappy translations are the primary cause of these weirdness. ?-) |
#10
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On-Off-On vs. On-None-On .
"josephkk" wrote in message
... I suspect that really crappy translations are the primary cause of these weirdness. No, these are from American catalogs selling (mostly) American-made switches. "Someone" decided to change the way multi-throw switches are labeled/designated. |
#11
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On-Off-On vs. On-None-On .
[mom] is momentary. it returns to [off] once you let go.
on-off can be make-before-break, which is sometimes super useful, sometimes super sketchy. on-none-on clarifies that the switch is definitely break-before-make. It only has two positions. on-off-on is as previously mentioned. not sure myself about the use of brackets; eg off-(on) versus off-on Methinks it could be [mom] notation |
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