| 摘要 |
PURPOSE:To prevent disturbance of pictures at a head switching point by providing a terminal which adjusts the output terminal DC of a regenerative amplifier IC for the purpose of eliminating the DC offset of the regenerative amplifier which causes inversion phenomena, waveform distortion, etc. at the head switching point. CONSTITUTION:When the value of a resistance 17 is reedueced, the emitter current of a transistor TRQ12 is increased, and that of TRQ11 is increased, and the base potential of a TRQ13 is reduced, and the DC voltage of an output terminal 12 is reduced. When the value of a resistance R16 is reduced, the emitter current of the TRQ12 is reduced, and the base potential of the TRQ13 is raised, and the DC voltage of the output terminal 12 is raised. Thus, the ratio among resistances R16, R17, and R15 is changed to change freely the voltage of the output terminal 12 in both of positive and negative directions. Consequently, this circuit is used for, for example, an amplifier 3 of a conventional circuit to adjust the DC offset between amplifiers 3 and 4. |
