This circuit was obtained in a 1967 Electronics World. The components are still common today, the SCRs can be replaced by equivalents and the unijunction transistors the 2N2646.
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...