This receiver, called Peace, was manufactured in the 1960s in Japan and was powered by a 9 V battery. The radio for medium waves had an earphone and good sensitivity.
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...