Cgs synth

>Is it possible that the VCF wants a lot more current than the
>TL071 can give?

I'd hope not. Input impedances should be 100k or greater if its designed right.

Ken

>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
>
> 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
>>
>>
>
>
>[Non-text portions of this message have been removed]
>
>
>
>
>The CGS Modular Synth home page: http://www.cgs.synth.net/
>
>Yahoo! Groups Links
>
>
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>
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>

_______________________________________________________________________
Ken Stone sasami@... or sasami@...
Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
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