Found in 1965 Delco Radio documentation, this circuit uses transistors from that era. Modern equivalents can be used. The characteristics of the inductor were not given.
This circuit appears elsewhere on the site. The circuit shown is from an American 1980s...
This circuit can produce signals up to 100 kHz depending on C1 and R1 adjustment. The output has a...
This circuit is from an old publication from 1977 and can be implemented with more modern...