Switching drive circuit

A video tape recorder motor drive system, comprising:

• a video tape recorder having means for processing television signals on a magnetic tape and including a drum motor and a capstan motor for driving the tape;
• first and second switching circuit means for respectively applying power to the drum and capstan motors;
• a common dc power source connected to supply power to the first and second switching circuits to be switched through to the respective drum and capstan motors;
• first and second pulse width modulator circuit means respectively connected to the first and second switching circuits for providing a square wave drive signal of a variable duty cycle;
• a signal generator means for producing a signal to be fed to the pulse width modulator circuits, the signal generator having a frequency corresponding to a horizontal frequency of the television signals associated with the video tape;
• and
• means for providing a 180.degree. phase difference for signals from the signal generator fed to the second pulse width modulator circuit relative to the first pulse width modulator circuit such that the "on" period for the first switching circuit has a 180.degree. phase difference relative to an "on" period of the second switching circuit.