Wayne Parham Messages: 18836 Registered: January 2001
Illuminati (33rd Degree)
You're right that the key to quality is precisely matching resistor values. It's kind of like tube matching. You just get a ton of 'em and measure to find exact matches. The resistors are cheap, so that's not a problem. It's the time it takes to do it that might be kind of a drag.
That little board would be great for an 8-bitter. But I think I'd prefer more resolution that that. Look for something like this:
You could go to a higher resolution than 16-bits, but I'm not sure you would benefit from it 'cause the minute differences of resistor values would probably be greater than the increased resolution you gained.