[sdiy] OPA604 anyone?

[Antti Huovilainen]

On Fri, 19 May 2006, René Schmitz wrote:

> I take both Self's and claims on datasheets with a healthy portion of 
> skepticism. I don't have the means to measure on this scales so I can't say 
> for sure who is right or wrong here.

Actually you just might have...
If you have say M-Audio Delta 1010, it has a THD of 0.0003%. Certainly 
good enough to give an educated guess at least.

Feed -1dBFS sinewave throug a simple gain circuit (with the opamp to be 
tested) and use resistor attenuator to bring the output gain back to 
unity. Using FFT analysis (Adobe Audition for example can do this easily), 
you can check both distortion and noise performance.

Antti

"No boom today. Boom tomorrow. There's always a boom tomorrow"
   -- Lt. Cmdr. Ivanova