[sdiy] Square to Sine

[Elain Klopke]

>
>
> If you use an op-amp as buffer (filter output to + input, output to -
> input) such as TL-072 you won't have much drop to worry about.
>
> For pass-band you will have essentially no loading from the caps, and the
> op-amp will do nothing, so you will be close to unity gain then for the
> pass-band. It all depends on how the cut-off corner of the filter depends
> on the base frequency of the signal. If you think the loss will be a little
> too much, alter the feedback of the buffer op-amp to that of an amplifier
> with two resistors allows for the needed gain without making the design too
> complex.
>
>
> I'm assuming that the circuit would go something like this: output from
PIC -> RC network chain -> Non-inverting amplifier -> 4066 switch matrix

I'm thinking the non-inverting amp since the resistors for the gain aren't
dependent on the resistors involved in the filter networks. Unless of
course I'm entirely wrong on how that works...
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