Found in Popular Electronics from the 90s, this circuit generates signals in a frequency range set to R7 and basically determined by C1. Operational and equivalent transistors can be used.
The circuit shown in figure 8 is an application suggestion for ISL8107, a new integrated circuit from...
This blocking oscillator that appears elsewhere on this site from other sources, was found in a...
This is a diagram of a 1958 commercial receiver. The circuit was found in documentation at the...