This electronic Morse key was found in a Popular Electronics from the 90's. The components are common, but there is a mechanical part that requires assembly skills.
More inputs can be added to this adder that we found in the January 1995 Electronics Now magazine....
This circuit has a fairly common configuration consisting of a counter phase oscillator. The power...
This oscillator uses germanium transistor avaialble in 1958 when the project was published....