ELECTRONIC VOLUME DEVICE

摘要

PURPOSE:To reduce the level of click sounds produced when the degree of attenuation is varied, by providing a diode limiter circuit at the input side of an operational amplifier which forms an electronic volume device. CONSTITUTION:A signal source 1 is connected to an operational amplifier 4 via a resistance network 2 and a switch means 3. The input signal supplied from the source 1 is extracted through an output terminal 6 after the degree of attenuation of the input signal is varied by controlling the means 3. Then a diode limiter circuit 7 consisting of diodes 20-1 and 20-2 connected adversely to each other is added to the input side of the amplifier 4 of an electronic volume device. The circuit 7 functions to suppress the level of impulsive noises that are produced when the degree of attenuation is varied for the input signal. Thus the generaton of click sounds can be reduced.