[sdiy] Help with noisy VCA

Tim Ressel timr at circuitabbey.com
Thu Aug 31 23:28:16 CEST 2017


Their website shows PTH but not SMT. I've got an email in to tehm.

--TImbo


On 8/31/2017 2:26 PM, Mrs Paula Anne Maddox wrote:
> Tim,
>
> You can get any 2164s from cool audio.
> As for the vca, I'd suggest the Gilbert multiplier based one, check modulus ezine 5 (it's on the web) for a schematic. You don't need a 3046 as long as you have two matches pairs, but you can get the 3046 in smt still.
>
> Paula
>
> On 31 August 2017, at 22:17, Tim Ressel <timr at circuitabbey.com> wrote:
>
> Hi,
>
> I am still having trouble with this VCA design:
>
> https://drive.google.com/open?id=0B2yaoNYlV1nMWFhSRWUwdlU3TzQ
>
> It is noisy, and it gets worse as you turn up the gain. I tried
> switching to a 2164 design but its no longer available in SMT.
>
> Any ides?
>

-- 
--Tim Ressel
Circuit Abbey
timr at circuitabbey.com




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