| 摘要 |
PURPOSE:To reduce greatly the effect of the power source ripple by applying the signal which features the same phase and nearly same level as the power source ripple signal to be applied to the non-inverse input terminal of the differential input acoustic amplifier to the inverse input terminal of the acoustic amplifier as well. CONSTITUTION:The breeder circuit in which 1st and 2nd resistance 7 and 8 connected between power terminal 5 and common terminal 6 are connected in series is provided, along with differential input acoustic amplifier 14 containing non-inverse input terminal 1, inverse input terminal 3 and output terminal 4 plus 3rd resistance 11 connected between terminal 4 and 3. In addition, the connecting means provided between input terminal 1 of amplifier 14 and connection 2 of registance 7 and 8 in the breeder circuit, i.e., 1st capacity 13 between terminal 6 and connection 2 between resistance 7 and 8 is provided with in-phase amplifier 14' in which the input terminal is connected to connection 2 between resistance 7 and 8 and the output terminal is connected to input terminal 3 of amplifier 14 via the serial circuit of 4th resistance 10 and 2nd capacity 12. Thus, the effect of the power source ripple can be reduced greatly. |
