TPDD Cable

See the following:
schematic, pcb, and components to build a cable

Directions:

• Solder all components to pcb per the render pics.
• Pull the two un-soldered pins from the top of the socket and discard.
• Cut the 9-pin plug off the serial cable. Strip the outer sheath back 1 to 2 inches. Strip each wire 1/8".
• Put 2 to 3 inches of 1/2" diameter heat shrink on the serial cable. (don't shrink yet)
• Identify which color wires go to which pins on the DB25 plug.

Find pin 2 on the db25

Find which color wire goes to pin 2 using a DMM continuity tester

Repeat for all the numbered holes on the PCB: 2,3,4,5,6,7,20

Cut any left-over wires short right at the cable sheath.

• Solder the wires to their matching numbered holes, with the wires on the top side (without the transistors).
• Put some hot-glue on the top side of the pcb in the "dog bone", press the end of the cable into the glue, and secure to the pcb with a zip-tie.
• Add some hot-glue around the soldered wires where they meet the pcb to immobilize them.
• Slide the heat-shrink up over the pcb and shrink.

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Other/old/alternative versions of the cable