Light beam switch (CB21413E)

This circuit was obtained from a 1965 General Electric SCR manual. The components are from the period.

Cascading the 4017 (CB12128E)
In the diagram we show how to divide the frequency by multiples of 10 using several CMOS...
400 Hz selective filter (CB7519E)
This circuit was found in a 1982 Maplin publication. The circuit is tuned to recognize a 400 Hz...
2.3 A Boost Converter Using LT3518 (CB15595E)
In the figure we have another application for the LT3518 integrated circuit from Linear Technology...