This circuit uses a lamp driven by the Hertz loop and measures its brightness with ordinary photovoltaic cells. The circuit is from a Radio Electronics from February 1964.
This circuit was found in a Popular Electronics from the 90s. It uses a LASCR which is a photo-SCR...
The shunt type regulators are connected in parallel with the load, deflecting the current to...
This MW receiver was found in a Raytheon circuit manual from the 1960s. Transistors are the first...