| 摘要 |
PURPOSE:To reduce ripple even in a low frequency, by connecting one of two resistances between output terminals of two capacitors and by forming a control circuit part which applies the voltage between respective output terminals of capacitors. CONSTITUTION:In control circuit part 15, the output signal from output terminal 3 of gain control circuit 20 is detected by the first detecting circuit 21 and the second detecting circuit 22. The output from circuit 21 is sent to control terminal 4 through resistance 27. The circuit between resistance 27 and terminal 4 is grounded through capacitor 23, and capacitor 23 is charged by the output from circuit 21. Electric charge stored in capacitor 23 is discharged through the first resistance 25. The second capacitor 24 is charged by the output from the second detecting circuit 22 and is discharged through the second resistance 26. Then, the output voltage of capacitor 24 is applied to the other terminal of resistance 25. |
