Thanks for the response Ken. I may swap out one op amp before I do
anything else to see how I like that.
I was surprised to see your response sinc I had not seem my own post
come through yet.
Best,
Larry H
--- sasami@... wrote:
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anything else to see how I like that.
I was surprised to see your response sinc I had not seem my own post
come through yet.
Best,
Larry H
--- sasami@... wrote:
>_______________________________________________________________________
> >So, I am wondering what parts others have used. According to the
> >instructions, I should be using a low leakage cap. These may not
> >quality. So, I am thinking I will change all my Cx out to 100n to
> >200n range and use polypropylene. Any experience anyone has to
> offer
> >will be appreciated.
>
> Also perhaps changing op-amps will help. Find an op-amp with higher
> input
> impedence than the one used.
>
>
> >Next, my initial observation is that a negative voltage at the
> input
> >is not going to work at all. Any others care to comment?
>
> It will work. Sure, the analog switch is operation in the positive
> area
> only, but that is what those funny op-amp buffers are their for -
> they
> recuce the range of the input switng, and center it around 7.5V.
> This also
> in part contributes to the faster droop rate, as it is amplified
> when the
> range is restored at the output.
>
> >My next question conerns the imput impedance. Is there any
> specific
> >reason for the 22K input to TL074d? Does it not make any sense to
> >raise the value of the two 22Ks and apply the same percentage
> >increase to the 10K feedback resistor to have a higher input
> >impedance load on sensitive voltages like 1v/oct control? I dunno.
>
> >That's why I ask.
>
> Increase the resistors if you like, but keep the ratios exactly the
> same for
> the above reason.
>
> Ken
>
> Ken Stone sasami@...__________________________________
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> <http://www.blaze.net.au/~sasami/synth/>
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