CW tone generator (CB21673E)

This telegraphy circuit generates an audio tone from a pure RF carrier. We found it in a publication by Gernsback from 1960.

CMOS square oscillator (CB26054E)
This circuit was found in the July 1998 issue of Electronis Now magazine. It is a traditional...
SCR Motor Control (CB19377E)
The diagram, obtained in an old European documentation, shows the ways to trigger and to shut down...
Who is the fast for 4 competitors (CB3859E)
We found this circuit in a Poptronics from 1998. The circuit can be extended to more competitors...