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

http://wb9kzy.com/norcal.htm

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.