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Electronic attenuator (BC148)

2016-10-06 07:25  
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This article describes the Electronic attenuator (BC148). The content is very simple, very helpful. Components in this article can help you understand better understanding of this article. For example, in this article, you can go to find and buy these components: BC148. 

tw1o 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