This circuit was obtained in a QST magazine from the 90s. The circuit makes use of components that are uncommon today. The circuit includes a gain selection switch.
This interesting circuit of the American publication Electronics Handbook Volume XIII 1993 shows a...
The circuit shown in the figure generates a rectangular signal whose frequency depends on C1. For...
This 4-competitor TTL speed game was obtained in a 1980s documentation, but can still be easily...