Key as relay
In the olden days of the 20th century Morse code keys were so common and cheap that you could do stuff like this: source on page 38: https://www.worldradiohistory.com/Archive-Radio-TV-Experimenter/Radio-TV-Experimenter-1967-08-09.pdf BTW, I don't know what they are talking about at the end: "since most keys have both a make and a break contact" - I've never seen this - keys are single-pole-single-throw AFAIN. I think the only way I could sanction this project is using one of those cheap keys with a plastic base like this one that came with the Knight-kit LC-1 CPO: Now Digi-Key doesn't sell keys (if they ever did). They *might* sell you Fahnestock clips: (the key relay uses two Fahnestock clips) at $3.54 each in quantity 1000 and they have to be special ordered ! Yeah, I don't think I'm going to go into the key as relay kit business anytime soon ! Best Regards, Chuck, WB9KZY http://wb9kzy.com/ham.htm