Replace a potentiometer by a digital pot

[Acetronics2]

Hi, Roger

another excerpt ... from the 317 datasheet ...

Smells the R-2R ladder ... don't you think !

with a full port ... 256 steps : no so bad !

Alain

[flotulopex]

...snif et m.... encore raté!

Thanks Alain, I've seen this info but, unlike in the shema of my first post, the High end is "open" (not connected) and I thought this would be okay this way.

Okay then, so how should I control the voltage regulator if not with my DS1804?

The AD7376 is another option, yes.

And yes, I've tried to control the LM317 with R+Tr already but you fully loose in ouput voltage precision.

Is there a other way to do?

[flotulopex]

Alain,

How would you make a 256 resistors ladder with 8 ports?

Any example?

[Ioannis]

Hope this helps.

http://www.irctt.com/pdf_files/LADDERNETWORKS.pdf

Ioannis

[flotulopex]

Is it correct to say that this is a Digital-To-Analog converter?

[Ioannis]

That is correct. This is exactly what it does.

Ioannis