[sdiy] A-440 Reference Oscillator interest?

[David Brown]

There was some discussion here a while ago on the need for an A-440 
reference oscillator.  I made mine with a Clare M-991 call progress 
tone generator.  It works well but they are hard to find.  I decided 
to design one around an Atmel AVR processor / switched filter that 
produces a square and sine wave output.  Here's a link to the project:
http://modularsynthesis.com/a440/A440.htm

So the question ... is there any interest from this group?

Would you be interested in a programmed IC?
Would you be interested in a small PCB?
Would you be interested in the filter IC?

Let me know.  I'm done with the project and have looked into the 
possibility of parts or PCBs if there is sufficient interest.

I detail some of the math on the web page. The accuracy of this is 
well below that of tuning by ear and better than most home test 
equipment to measure it.  Parts cost should be pretty low and only 
requires a couple of external components.

Dave