Motorcycle headlight monitor (CB9117E)

This simple circuit was found in Popular Electronics from the 1980s. The circuit uses an LED as an indicator.

Touch Switch (CB14955E)
This simple CMOS touch switch with bistable action must not be powered by a source without a...
One Transistor Alarm (CB914E)
This one-transistor alarm can be used with much more sensors than the two shown by the figure....
DC speed control (CB7149E)
This circuit was suggested by Sprague Electric in an 80's documentation. The circuit uses a...