Now is there any kind of switch that will reverse the polarity of the
coil electrically like in this picture?
http://www.geocities.com/smpaladin/switch.jpg
Once a current is applied to the red switch, it reverses the polarity
of the coil as long as the current is applied. If this sounds
ridiculous, don't blame me since I may have no idea what I'm talking
about.
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This is seb; don't worry about it.
Here's one way to do it:
BAT+>--------+---------------------------+--O--> | S1
| | |
BAT->----+-----------------+ | O
| | NC K1A NO | NC K1B NO| |
| O-->\ <--O-+-O-->\ <--O |
| \- - - - - - - -\- - - - - -[COIL]
| O COM O COM |
| | | |
| | +-----+ |
| | | |
| | [MAGNET] |
| | | |
| +---------------------+ |
+---------------------------------------+
With S1 open, the polarity of the magnet will be oriented onE way, and
with S1 closed the polarity will reverse.