[sdiy] Filter Frequency response measurement ?

[dj hohum]

On 7/27/07, Needham, Alan <Alan.Needham at centrica.com> wrote:
> Lin or exp - my choice would be exp for audio applications, you could
> then scale the sweep such that each vertical division on the scope
> represents an octave (or two).
> Lin might be more appropriate if you want to do a v/Hz study, it
> depends on how you want to present the results.
>
> Surely, an oscillator is an oscillator is an oscillator! who cares how
> it is formed - a phase-shifted feedback path on anything with gain -
> I used to have a power supply that gave a brilliant supersonic sine out.
> All you want is a decent sine and voltage control - resonant VCF sounds
> great.
> 	Alan

Well, yes, I didn't mean blasphemous from a circuit perspective, I
mean that I was going to use one of my many VCF on a chip chips,
either a 2044 or a 3328. I can't think of an easier way to get a
simple, fairly accurate, single chip + few components sine wave VCO.
Any discrete choice would  require as much work as an expo VCO. Is
there a simple vc sine wave oscillator?

tnx,
daryl