Ken,
Sorry... I forgot to mention that I set it up for 2x gain... not much, but
just enough to bring the SID up to modular specs.
The reason that I built it in the first place is that I ran into the same
problem with the VCF-2F not having any resonance
with the SID output fed in directly. I thought the VCF just needed a
slightly hotter input signal, but that doesn't seem to
be the case. Is it possible that the VCF wants a lot more current than the
TL071 can give?
-gerald
Sorry... I forgot to mention that I set it up for 2x gain... not much, but
just enough to bring the SID up to modular specs.
The reason that I built it in the first place is that I ran into the same
problem with the VCF-2F not having any resonance
with the SID output fed in directly. I thought the VCF just needed a
slightly hotter input signal, but that doesn't seem to
be the case. Is it possible that the VCF wants a lot more current than the
TL071 can give?
-gerald
On 10/3/05, sasami@... <sasami@...> wrote:
>
> Something odd is going on. The CGS60 gives a 20x gain, and is very high
> impedance - around 150k. If you are only getting a fraction of a gain,
> there
> is something seriously wrong with what's driving it. Add a CA3140 or maybe
> a
> TL071 as a non-inverting voltage follower/buffer to lower your output
> impedance.
>
> Ken
>
>
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