This circuit triggers a relay when the set temperature is reached. The circuit is from an old documentation. The relay may be equivalent according to the transformer secondary voltage.
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...