In article ,
"William Sommerwerck" wrote:

"Phil Allison" wrote in message ...
"William Sommerwerck"

I've been selecting parts to upgrade a pair of Advents. In the process, I
discovered I didn't know the difference between ON-NONE-ON and
ON-OFF-ON. Duh...

The use of "none" in the descriptions of toggle switches seems to be a new
thing.
Google tells me that several makers are doing it but not when it was they
conspired to do so.
My Farnell catalogue (about 2 years old) has no such "none" sense in it.

I discovered my seeming ignorance when I read a catalog page that treated all
double-throw switches as if they had /three/ positions. Those /without/ a
center position received the NONE description.

Have any of you ever run across what looks like a double pole double
throw that is actually a one pole three position?



1 T 2T T T T T
l /l /l /
l / l / l /
3 T/ 4T T/ l T/ T
l l l
l l l
5T 6T T T T T

fig 1 fig 2 fig 3

In all figures the hash marks between 3T and 2T represent an outside
shorting connection. The small case l's represent the "wiper" positions.
If you take 4T as the output and 1T,5T and 6T as inputs[or vise versa].
The Sw becomes a 1 pole 3 pos sw.

CP