I don't know any part numbers but have a look at what the Morserino does (https://www.morserino.info/ https://www.morserino.info/) or this reddit post: https://

I don't know any part numbers but have a look at what the Morserino does (https://www.morserino.info/ https://www.morserino.info/) or this reddit post: https://www.reddit.com/r/amateurradio/comments/ag7xpi/project_super_simple_capacitive_touch_paddles_for/ https://www.reddit.com/r/amateurradio/comments/ag7xpi/projec...