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For connections using a 3.5mm cable, you can refer to this:
Many HF transceivers use a stereo jack for the internal electronic keyer. Some have a 1/4" jack, while others have a 3.5mm jack. This describes how most of these are wired to a CW paddle.
On a TRS cable (tip, ring, sleeve - 3.5mm)
Red: tip (left, dit)
White: ring (right, dah)
Yellow: sleeve (common ground) (this wire could also be black)
If you are right-handed, use the left paddle for the "dit" signal, which connects to the tip of the plug (the red connection). The white paddle is for the "dah" signal and connects to the "ring" terminal on the plug, next to the tip. The common ground wire connects to the base "sleeve" connection on the plug (the yellow wire).
Specifically, for a 3-section 3.5mm cable, the top section is labeled "drop," the second section is labeled "tap," and the bottom section has a common ground. You can adjust it according to your preference, whether you are right-handed or left-handed.
Source:https://ad6dm.net/log/2018/02/wiring-a-cw-paddle/
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