The configuration shown was found in an old Poptronics but can be easily assembled using a common calculator photocell. The relay is according to the supply voltage.
This 5.1 MHz oscillator was found in a 1980s American documentation. The used operational...
Found in a Popular Elecronics from the 90s, this circuit appears in other versions in this section and...
This circuit was found in the May 1998 issue of Electronics Now magazine. The circuit drives a set...