Parts: DS1801 SPI audio volume potentiometer

posted Mar 16th 2009 8:30am by Ian
filed under: digital audio hacks, parts

ds1801

Dallas/Maxim’s DS1801 is an audio volume potentiometer with a simple SPI interface. This chip has two channels of volume control that might be useful in a DIY audio project. We previously looked at the DS1807, a similar part with an I2C interface. This week we’ll show you how to use the SPI version.

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Parts: I2C audio volume potentiometer (DS1807)

posted Feb 16th 2009 11:19am by Ian
filed under: digital audio hacks, parts

ds1807ii

The DS1807 contains two logarithmic digital potentiometers (pots) for audio volume adjustment. Each pot has 64 volume levels plus a mute setting. The volume level of each pot is set over a two-wire I2C serial interface. We’ll show you how to connect and interface the DS1807 below.

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Resistive ladder volume control

posted Jan 10th 2009 5:30pm by Eliot Phillips
filed under: digital audio hacks, home entertainment hacks

preamp

[jefffolly] published some straight forward plans for a passive volume control. It uses a resistive ladder built across the contacts of 12W rotary switches. Each resistor provides a 5dB difference, and he recommends using 0.1% tolerance resistors to maintain accuracy. The use of discrete resistors instead of volume pots means that the output is much more predictable. All of the RCA sockets were connected using oxygen-free copper wire.

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