RECORDING/REPRODUCING CHANGEOVER CIRCUIT FOR MAGNETIC RECORDING AND REPRODUCING DEVICE

PROBLEM TO BE SOLVED: To provide an inexpensive recording/reproducing changeover circuit of a magnetic recording/reproducing device having satisfied properties. SOLUTION: A drain of a MOS field effect transistor 41 is connected to the side of a terminal H2 of a magnetic head 10, and to the source, a source of a MOS field effect transistor 42 is connected. A reference voltage generating part 36 is connected to a drain of the transistor 42 to impress the reference voltage Vref. At the time of recording operation. the transistors 41, 42 are made into the OFF state by a transistor 43 connected to gates of the transistors 41, 42, and also the side of the terminal H1 is set to the reference voltage Vref, then a signal to be recorded and a bias signal are supplied to the side of the terminal H2. At the time of reproducing operation, the transistors 41, 42 are made into the ON state and the side of the terminal H2 is set to the reference voltage, then the recorded signal is read out from the side of the terminal H1. The circuit is constiuted at a low cost since the MOS field effect transistor is used, and also the reproducing signal having the satisfied S/N ratio is obtained since the ON resistance values of the transistors 41, 42 are small.