digital pot for tone control?

[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?

 

[jackinnj]

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.

 

[Gcollier]

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.

 

[G4ME]

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

 

[Vidalgo]

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.