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 circuit was found in an old Poptronics but is still current as transistors can be replaced...
July 2017 - The new TLP240 and TLP241A optical couplers with MOSFET output, manufactured by...
This is one of the many versions of amplifiers with LM386. This was achieved in an old publication (1981). The...