Found elsewhere in this section, but from other sources, this circuit is from a 1964 Electronic Design. The transistor is from the era and the power voltage depends on this component.
The presented circuit generates signals in a 1:10 frequency range depending on the Ct capacitor. See the...
This circuit was found in a 1990 Electronics Handbook. The transistors can also be the BC548 and...
Suggested by an Electronics Now magazine from April 1994, these circuits can be used as output...