> Or go to Analog Devices and get a DDS (Direct Digital Synthesis)
> generator chip.

Silicon Chip May 2003 has such a generator. AD9835 (+ 16F628 for
selection and display) to output 1Hz to 10MHz, sine / square

http://www.siliconchip.com.au/cms/A_102145/article.html

http://www.analog.com/en/prod/0,,770_843_AD9835,00.html

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