We found this mains-powered switch circuit in Electronics Now magazine from July 1994. It could be used in a table lamp or touch control.
Although it is a configuration still known today, this is from a Japanese publication from 1960....
This circuit was found in an English documentation from the 90's. Equivalent components such as...
This speed control for small DC motors can operate from 6 to 12 V sources. The motors can drain...