General Electric suggests this circuit in a 1980s documentation. The operational of the time is FET-type input. Modern equivalents may be used.
This simple circuit, which appears elsewhere on this site, was found in a transistor manual from...
This transmitter operates in the FM band emitting beeps that can be picked up on a common radio at...
This circuit was found in the June 1996 issue of Electronics Now. Integrated circuits must be...