Found in Popular Electronics from the 90s, this circuit consists of a timer that turns off the power of a circuit after a time determined by C1, saving the battery.
The CMOS 4046 integrated circuit is not very common today, consisting of a very efficient PLL for...
This circuit was obtained from an American documentation from the 90's. The components can be...
We found this simple music box circuit that can also be used in a musical bell in a 1991...