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Two low voltage, low power zeners are
used to control electronically the level of an audio
signal. The attenuation range is from 6 to 58dB for an
input current from 0.042 to 77 mA corresponding to a
control voltage from 2.7 to 7.5V. If control voltage is
limited to 5V, the attenuation is around 30dB at a
control current of 2mA. This is not an HiFi attenuator
but might come useful as a general purpose audio
attenuator
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