INTEGRATED CIRCUIT FOR TAPE RECORDER

PURPOSE:To complete a tape recorder with addition of a small number of parts by applying the ternary logic to a sound recording/reproducing switch terminal to secure a sound recording mode with application of positive and negative potentials to said switch terminal and then a reproducing mode by opening the switch terminal or with application of an earth potential. CONSTITUTION:Both sound recording and reproducing amplifiers are set in the reproduction modes when a potential which is applied to a recording/ reproducing switch terminal 13 is opened or an intermediate potential. Then both amplifiers are set in the sound recording modes when a potential which is applied to the terminal 13 is positive or negative. Therefore the conventional reproduction is available if the recording is performed with a positive potential secured with the sound recording/reproducing switch terminal of another circuit and the reproduction is performed with other potentials. While a power supply switch 21 of a bias oscillation circuit is set at the negative power supply side when the sound recording is performed with a negative potential secured with said switch terminal of another circuit and the reproduction is performed with other potentials. Thus it is possible to complete a tape recorder just with addition of a small number of parts in comparison with the conventional structure.