The RCA integrated circuit used in this control is uncommon today. The circuit is from an Electronics Now from July 1995. The sensor determines the value of the adjustment potentiometer.
This power control with SCR was found in Radio Electronics from April 1966. The components are...
A frequency divider for digital signals can be constructed based on a single 4018 integrated...
The circuit shown is from Motorola's 1990 Linear Databook. Shaded components are optional. The...