This thermal control circuit appeared in Radio Electronics magazine in October 1958. The circuit is powered by the power grid and has two sensors that operate in a differential mode.
With this circuit, a relay can be activated from an alternating signal with frequency up to a few...
With this circuit the visually impaired can easily locate important places inside the house, such...
In the figure we have the way to use the transistors of an old-paired pair as a trigger circuit. The...