LGB Switch Motor Direction Indicator
d. bodnar 02-06-2011
Click here for revised schematic
This circuit will allow you to throw an LGB switch motor with a DPDT momentary on / center off switch so that a 12 volt pulse will be delivered each time the switch is thrown one way or the other. The switch I used is similar to this one:
A dual coil latching relay similar to this one:
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=PB1085-ND
is used to drive two LEDs.
Please note that some dual coil latching relays are polarity sensitive. The one I used was that type and the wiring shown here does work. Other relays might need the wiring to the coils to be reversed.
This is a breadboard "proof of concept" test.
(note that it looks like both LEDs are lit - the red is lit
the green is reflecting the flash)
Here the switch has been thrown the other way.
A close-up of the breadboard.
Revised Schematic for another relay style with these contacts:
Note: this circuit has NOT been built & tested and is subject to revision
