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Old 23rd May 2005, 10:44 AM   #1
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Default digital pot for tone control?

i would like to ask whether it is possible to use digital pots instead of normal pots for a baxandall one control circuit?..any suggestions?
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Old 23rd May 2005, 01:58 PM   #2
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you have lots of choices -- from Texas Instruments, Analog Devices, Maxim, Microchip -- just make sure to keep voltages within the tolerances specified.

Nat Semi has a line of digital pots with a logarithmic taper.
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Old 24th May 2005, 01:17 PM   #3
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Default Re: digital pot for tone control?

Quote:
Originally posted by demons_wing
i would like to ask whether it is possible to use digital pots instead of normal pots for a baxandall one control circuit?..any suggestions?

Take a look at the DS1809 from Dallas Semi, It has a simple contact closure interface that avoids the need to use a microcontroller and also has non volatile memory so your settings are retained.
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Old 24th May 2005, 09:17 PM   #4
G4ME is offline G4ME  United States
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Ohhh, Free samples ordered

use that with a PIC chip and an encoder with an LCD you have one sweet GC for and additional 30 bucks or so
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Old 25th May 2005, 09:22 AM   #5
Vidalgo is offline Vidalgo  Israel
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just make sure to keep voltages within the tolerances specified.
Not only voltages must be within spec. "Wiper" current also have a very limited max. value. High-impedance load to wiper must been provided.

Generally, the common problem with digital pots is that most of them are working from a single-supply voltage. So, any AC input signal must been biased to half of this supply voltage.
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