David--
The IH notes were a starting point, but I still had to work out the details. See the attachment for a schematic.
Once I detached the ball from the tip, the guts just slid out thru the battery compartment. Just pull the ball out far enough to expose the eye hook on the end of the spring, then unhook it.
If you don't already have it, you can get a MIDI cable with 5-pin DIN connectors from Radio Shack or any number of sellers online.
I soldered the optoisolator, resistors, and the LED from the edge finder to a small piece of perf board that fit inside the battery compartment. Make sure none of the leads or wires contact the inside of the casing.
The casing of the edge finder is hardened. I used a carbide endmill to make the hole for the cable.
It's fiddly work getting everything into the casing. It took me more than one try, but I'm happy with the final result.
Good luck! |