| 摘要 |
PURPOSE:To suppress the change in the set level at transient state, by providing the gain set and preset according to signal level. CONSTITUTION:In a change-over switch 10 at AUTO position, a signal is given to a digital control section 4 via a level detector 6, AD converter 7, and counter 5. The digital control section 4 detects and stores the maximum value out of the count output fed from the counter, and the digital output is given to the variable gain circuit as a control signal. The transient output voltage at on the power supply switch 13 is fed to a load control terminal of the counter 5 via an integral network consisting of a resistor 14 and a capacitor 15 and a transistor 17. By setting the preset value given to the load input terminal 2 to a suitable value, an abnormally high level of the signal level appeared at the output terminal 2 can be avoided even immediately after the application of power supply. |
