| 摘要 |
PURPOSE:To attain ease of adjustment with a simple constitution, by giving the 1st input signal to a base of the 1st transistor(TR), obtaining the 1st output voltage from a collector, giving the 2nd input signal to the 2nd TR and obtaining the 2nd output signal from the collector. CONSTITUTION:Changeover switches 16, 27 are selected to the fixed terminal REC position at storage, TRs 22, 23 are inoperative and only a TR15 is operative and the emitter of the T15 is grounded via an impedance circuit 200 through a pin 28. The TR15 and the circuit 200 form a filter. The changeover switches 16, 27 are selected to the fixed terminal PB position at reproduction, then no TR15 is operated, the TRs 22, 23 are operated, TRs 44, 43 externally mounted are turned on and the collector of the TR22 is connected to a power supply terminal 29 via the circuit 200 through the pin 28. Thus, the TR22 and the circuit 200 form the filter circuit. |
