This 1974 circuit uses two 555 integrated circuits in a very traditional configuration. The circuit can be powered by voltages from 9 to 12 V and for greater volume an amplifier stage can be added.
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...