Found in documentation from the 1980s, this circuit can generate signals between 6 and 8 MHz. The frequency can be slightly varied in the setting. FET is a general-purpose type.
This LCD driver circuit uses a common component today. The circuit is from 90's documentation....
This circuit is from an old manual, but can be easily assembled as the integrated one is still...
This circuit detects alternating signals that are too weak to trigger a relay. The circuit is from...