Digital potentiometers

Design Concepts
1

Hi there,

I was looking at possiblitys of automating resistance between two points rather than CV voltages to one point.

the circuit below allows us to increment/decrement the resistence of a digital pot using only  two switches.

http://www.maxim-ic.com/appnotes.cfm/appnote_number/1118

I havent much of a clue with electronics, but I was thinking that maybe a change in this circuit could enable us to control these digital pots with Dout pins …

Would anyone know a way of doing this?

thanks in advance,

Alex

2

Hi,

You might be more interested in using Digipots directly controlled by PIC. Captain Hastings Did this with Analog Devices AD5204 chip and modified AOUT driver, check:

http://69.56.171.55/~midibox/forum/index.php?topic=2556.msg17995#msg17995

Bye, Moebius

3

Moebius,

This was just what I was looking for! Thanks to you and Captain (Hastings) <-my place of birth!  ;D