This circuit was found in the June 1995 Electroics Now magazine. The relay should be a sensitive type with up to 100 mA trigger current.
We found this circuit in a 1971 documentation. The circuit can be assembled with more modern...
The frequency of this oscillator depends on R and C (see math section for electronics). The...
This amplitude modulated (AM) oscillator was found in an Electronic Design from 1965. The circuit...