A Microchip Inc datasheet covering the MCP4xxx family of digital potentiometers (Dpot) includes an interesting application circuit on datasheet page 15. See Figure 1 for a (somewhat edited) version of ...
Digital potentiometers (pots) offer advantages for audio volume (gain) control applications and can replace bulky mechanical pots, especially in handheld portable devices such as MP3 players, PDAs, ...
Normally, if you want to control the gain of an amplifier, you’ll use a variable resistor. You know, like a volume control. But what if you want to control the amplifier’s gain with a voltage?
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