[sdiy] BBD clock bleed

Adam Inglis 21pointy at tpg.com.au
Tue Oct 23 11:30:14 CEST 2018


Quincas, I don’t think this list has ever “allowed”/facilitated pdf attachments? Not that I can recall anyhoo…

> ...On 23 Oct 2018, at 5:30 PM, Quincas Moreira <quincas at gmail.com> wrote:
> 
> thanks folks. It’s a new
> module, not yet released V3205 based. Strange that you don’t see the pdf attachment, I’ll try again in the morning
> 
> Sent from my iPhone
> 
> On Oct 22, 2018, at 23:59, Pete Hartman <pete.hartman at gmail.com <mailto:pete.hartman at gmail.com>> wrote:
> 
>> As others have said a lot depends on which BBD we're talking about.
>> 
>> Most of my BBD experience is with Blacet's Time Machine.  It uses the MN3005 which has balanced outputs, which can be trimmed to minimize the clock bleed, and it also uses clock dependent filtering and compansion to help reduce the noise further.  I have also played some with the Doepfer A-188-2 which uses a tapped BBD, and that does *not* have balanced outputs, so the bleed is harder to tame.
>> 
>> I looked at the Erica site as well, and honestly, I can't tell which one you're asking about either.  Let us know/attach the schem, and I'm sure someone will have suggestions :)
>> 
>> Pete
>> 
>> 
>> 
>> On Mon, Oct 22, 2018 at 8:55 PM Quincas Moreira <quincas at gmail.com <mailto:quincas at gmail.com>> wrote:
>> Hey friends! I'm working in a review of the new Erica Synths BBD module, and I'm getting massive bleed of the clock frequency (though it looks sinusoidal rather than square)
>> Any tips on minimizing this bleed? Anytime the clock steps into audible range it's super loud
>> 
>> Schematics included...
>> 
>> Thanks!!
>> 
>> 
>> 
>> -- 
>> Quincas Moreira
>> Synth Diy Guy
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