Abstract: The present light-receiving circuit provides a function capable of adjusting the temperature dependence and the output of the bias supply circuit independently. The light-receiving circuit includes a bias supply circuit, a voltage divider and a temperature compensation circuit that adjusts a division ratio of the voltage divider so as to depend linearly on the temperature. The temperature compensation circuit has a differential amplifier operating in the inverting mode, and a temperature-sensing resistor that connects the inverting input to the output of the differential amplifier. Since the temperature-sensing resistor has a linear dependence on the temperature and is connected as a feedback resistor, the output of the differential amplifier also depend linearly on the temperature.

Abstract: The present invention relates to an erasing head for a magnetic recording apparatus using a static magnetic field. The erasing head consists of a plurality of magnetic poles having surfaces which confront the recording tape. The first and second poles have polarities opposite to each other. The first pole is arranged to engage a recording track along its full width and magnetizes it to a given polarity. The second pole is arranged to engage the upper half of the track and magnetize it to the opposite polarity. Each half track is magnetized to opposite polarities so that the distortion of output signals is reduced, when the signal is reproduced by a reproducing head engaging both half tracks.