This simple metronome, from 1985 documentation uses only transistors and has two settings. For voltages above 6 V, up to 12 V, replace the BC557 with a BD136.
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....