2007/10/8, Paul Anderson wrote:

> I was just looking at AN-31 from National Semiconductor:
>
> http://www.national.com/an/AN/AN-31.pdf
>
> On page 9 they show a circuit that uses op-amps to produce square and
> triangle waves of variable frequency and amplitude.  There are also
> circuits in there for producing sine waves.

Thanks to everyone.  I apprecriate all the inputs.

I must admit that I am a bit slow when dealing with analogue kind of
thing. Will carry out some experiment.


Best regards,

-- 
WH Tan
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