Audio Gain Control With Digital PotentiometersStereo Gain Audio Trim Control CircuitThis circuit using the MAX5160L digital pot in a divider chain supplying the MAX4252 op amp with some positive feedback in addition to the usual negative feedback via the 100K and 50K resistors. The gain of this circuit can be shown to be: AV = (1-Kn)/(Kp-Kn)where Kn is the negative feedback fraction, Kp the
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