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.
This transistor source has the output voltage selected by zeners and the LED indication of which...
This filter can use almost any common operational amplifier and needs a symmetrical power source. The...
This receiver, called Peace, was manufactured in the 1960s in Japan and was powered by a 9 V...