[volt-nuts] Homebrew DVM

[Randy Scott]

> Thanks for the info.  I will read them tonight and assess whether
> I want to proceed with my original plan or revisit it.  I have
> no particular preference, just what is easiest and cheapest
> but high resolution and accurate.

The Wikipedia page on the integrating ADC also has some more
description on the basic dual-slope ADC as well as some of the
enhancements that have been made to it over the years.  Some
of the material from the patents is mentioned as well.

http://en.wikipedia.org/wiki/Integrating_ADC

Many of the designs end up being quite simple, but the devil

is in the details, obviously.

What I find most interesting about the design is that, in many
cases, components with absolute precision are not required.
Stability and low TC are what is needed and sometimes the
ratio of certain critical values are important.  Everything
else can be calibrated out at the end (within reason, of course).


Randy.