| 摘要 |
<p>PURPOSE:To achieve accurate compensation, by picking up a voltage dividing output with an amplifier inserting the 1st equalizer element to a feedback circuit and a circuit including the 2nd equalizer element, in reproducing a record disc recorded with an RIAA characteristic. CONSTITUTION:An input terminal 10a is connected to a non-inverting input of an operational amplifier 2, the 1st equalizer element 1a is inserted between the output terminal and an inverting input of an amplifier 10, and a resistor (R)3 is inserted between the inverting input and a common terminal 10b. A parallel circuit with the 2nd equalizer element 1b and a R6 is connected between the output of the amplifier 2 and a common terminal 11b via R5, and the connecting points of R5, 6 are connected to an output terminal 11a. Further, terminals 10b and 11b are short-circuited. The transfer characteristic of the circuit like this is proportional to the RIAA compensation characteristics completely, allowing to obtain an accurate equalizer circuit.</p> |
