This 10 A solid state relay was found in a 1980s documentation. It can work as a shield and implemented with modern equivalent transistors.
This switching buck regulator with the NE5560 was found in the February 1980 issue of Radio...
This commercial medium and short-wave radio was manufactured in Japan in the 60s. The circuit has...
Unlike the previous one, this circuit uses only one resistor in the base polarization. The...