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.
The integrated circuit used is uncommon today. The numbering in parentheses is for the second...
This circuit uses two relays to reverse the direction of rotation of a direct current motor. It...
This circuit activates the horn if the door is opened with the headlights on. The circuit is for...