Circuit for suppressing the noise produced by the switching of two voltage sources, particularly for audio preamplification stages.

摘要

A circuit for suppressing the noise produced by the switching of two voltage sources (1-3) having a direct current offset and connected alternately to the input of an amplification stage (6, 7). The circuit comprises a low-pass filter (11, 12, 32, 33) between the two voltage sources and the amplification stage, which filter is normally disabled during normal operation of the amplification stage, and is only enabled during switching of the two voltage sources, so as to enable a gradual change in the direct voltage supplied to the input of the amplification stage and due to the offset between the two sources. <IMAGE>