This high-power flasher for incandescent signaling lamps was found in a 1980s General Electric documentation. The circuit has a photoelectric control and is powered by the 110V grid.
Found in a Hands On Electronics of the 80s, this circuit makes use of a gas sensor of the time....
This control for a heating element was found in an old documentation. The current in the element...
This variable gain circuit for analog video signals was found in a 90s Linear Technology...