We found this switching circuit in a technical documentation from National Semiconductor. The integrated circuits and the transistor must be equipped with heat radiators.
This small audio amplifier circuit in complementary symmetry was found in the 1974 Mullard...
This is an experimental crystal radio that uses no power source. The antenna must be very long (at...
This brightness control for incandescent lamps or engine speed has been found in a 1970 English...