This timer, like the previous circuits, uses a currently uncommon integrated circuit. The time is given by capacitor C1 and R2 which has the range of values indicated in the diagram.
Figure bellow shows how n 4027 can be cascaded to form a divide-by-2. The maximum input frequency...
This medium wave commercial receiver from the 1960s was found in a Japanese publication at the...
This bistable and monostable Vox circuit was found in a 2002 documentation. The 556 is a double 555...