This circuit was found in a Signetics documentation from the 1980s. The integrated is a PLL and the SCR is a general purpose type The pitch frequency is given by R1 and C1 as formula next to the diagram.
Found in ancient American documentation this circuit uses semiconductors from the thyristor family such as...
The 8038 integrated circuit is not very common today. It is a circuit that generates signals of...
This circuit was found in General Electric documentation from the 1980s. The circuit is intended...