| 摘要 |
PURPOSE:To reject the switching noise at operation and non-operation of the amplifier, by grounding the output terminal of amplifier in AC manner for a given time. CONSTITUTION:The selection signal b fed to the terminal 18 controls operation or non-operation of the reproduction amplifier 2, and the output at operation can be obtained at the terminal 16. In this case, the signal b is fed to the trigger pulse production circuits 22,23 and the trigger pulses e,f produced after a given time is fed to the blanking pulse production circuit 26. Further, the blanking pulse h responds to the signal b and controls the switch circuit 17, allowing to connect the output signal at the terminal 16 in AC manner. Further, when the ON and OFF signal of the power supply is fed to the terminal 19, the switch 17 is controlled similarly. |
