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.
The LM12 integrated circuit consists of a high-power operating system capable of providing 100 W of...
This power control from Motorola's 1971 SCR Power Control Fudamentals can control full wave loads...
This circuit was found in Maxim's documentation from the 90's. The circuit provides 12 V x 120 mA....