| 摘要 |
PURPOSE:To save amplifying circuit and to decrease the space and power consumption, by directly connecting the primary and secondary circuits without buffer means. CONSTITUTION:The primary low-pass filter consisting of a resistor 1 and a capacitor 2, and the secondary high pass-filter consisting of resistors 6, 7, capacitors 4, 5 and amplifier 8, are directly connected to constitute a band-pass type active filter. In this case, the amplifier 8 separates the primary low-pass filter from the secondary high-pass filter, and the circuit constant is selected to have a prescribed characteristic. |
