45/** @page SignalDriverboardcables Signal Driver board cables
46 *
47 * Nine conductor ribbon cables (<a href="http://www.digikey.com/product-search/en?x=16&y=14&keywords=MC09G-25-ND" target="_blank">DigiKey part number MC09G-25-ND</a>)
48 * are used to connect between the Signal Driver Board and the signals. One
49 * end gets a 9-pin header plug and the other end gets a small circuit board
50 * with small screw terminals. The actual LEDs in the signals are connected
51 * to wire wrap wire, but wire wrap wire is too delicate to run long
52 * distances, but is needed to fit in the small brass tubes the signal targets
53 * are mounted on. Once under the layout bench-work, the wire wrap wire gets
54 * connected with screw terminals to the much more robust ribbon cable. The
55 * small circuit boards are again made from pieces of strip-board, with nine
56 * strips, eleven holes long. After cutting the boards, some of the copper is
57 * removed and four 1/8 inch (3.5mm) holes are drilled.