Re: SIMPLEST AND CHEAPEST KEYER?
I agree with Tom on the Jackson Harbor Keyer chips and kits.
I've used most of them starting with the PK-3 and now use the PK-4 in two keyers, home station and protable versions.
The NorCal chip is a nice basic Keyer
There was also the OzarkCon version of the NorCal with a feature variation but I don't see it listed now.
Both have pot speed control.