For DIY, how to program Arduino Mini Pro to act as an Audio Frequency White Noise generator? Presumably, a) using one Digital Output pin . b) feed to a simple passive RC low pass filter to reduce out of band signal . c) feed to a simple class-D IC chip audio amplifier and speaker . d) since it is DIY and noise, lo-fi (not hi-fi) is good enough. A two channel digital volume control circuit based on IC MAX5486 is shown here. MAX5486 is a 40K dual digital volume / balance controller that has a pushbutton interface. The IC has a built in bias voltage source that eliminated the need of an external circuitry for the same purpose and thereby by reduces external parts count.

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I want to be able to control the volume of an amplifier with an ESP8266 or arduino. I want to change the amp wiring as little as possible. 1.) Can I just take a digital pot with a matching resistance and replace the manual potentiometer with a digital one? I'm thinking of an MCP 4151, as they seem to be cheap and readily available.
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A two channel digital volume control circuit based on IC MAX5486 is shown here. MAX5486 is a 40K dual digital volume / balance controller that has a pushbutton interface. The IC has a built in bias voltage source that eliminated the need of an external circuitry for the same purpose and thereby by reduces external parts count.

Digital volume control arduino

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