>-----Original Message-----
>From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] 
>On Behalf Of PAUL James
>Sent: 30 April 2007 20:15
>To: Microcontroller discussion list - Public.
>Subject: RE: [PIC] [EE] Signal Generator
>
>
>
>
>
>Or go to Analog Devices and get a DDS (Direct Digital 
>Synthesis) generator chip. Add a high frequency master 
>oscillator, and a microcontroller with keypad and LCD, And get 
>any frequency between DC and master oscillator/2 in sub hertz 
>increments.
>
>I've done this and it works great.


Unfortunately the output at Fosc/2 is a square wave, you really need to have either a tracking filter or limit output frequency to a small fraction of the master clock.

Regards

Mike 

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