[sdiy] BBD clock bleed

Pete Hartman pete.hartman at gmail.com
Tue Oct 23 17:44:10 CEST 2018


I think trace runs are the more relevant part of layout, rather than
absolute positioning.


On Tue, Oct 23, 2018 at 10:39 AM Quincas Moreira <quincas at gmail.com> wrote:

> Thanks Dave, here's the image I have of the Layout
>
>
> https://drive.google.com/file/d/12I5AwggTgujKOEu-qFTio-IEbJMq1kAI/view?usp=sharing
>
> On Tue, Oct 23, 2018 at 10:30 AM Dave <dlmanley at sonic.net> wrote:
>
>> Also DA4 could be coupling clock noise through the supply lines into DA2.
>>
>> On October 23, 2018 8:15:35 AM PDT, Dave <dlmanley at sonic.net> wrote:
>>>
>>> Layout could be important too.  The schematic is only part of the picture.
>>>
>>> -Dave
>>>
>>>
>>>
>>> On October 23, 2018 6:07:28 AM PDT, Vladimir Pantelic <vladoman at gmail.com> wrote:
>>>
>>>> no output balance trimmer between out1 and out2 on this one
>>>>
>>>> On 23.10.2018 14:46, Quincas Moreira wrote:
>>>>
>>>>>  Sorry Folks, please follow this link
>>>>>  https://drive.google.com/open?id=1O5kKkaJZqom61W8WQKQCfm3gLF83goz0
>>>>>
>>>>>  Sent from my iPhone
>>>>>
>>>>>  On Oct 23, 2018, at 06:13, Tom Wiltshire <tom at electricdruid.net
>>>>>  <mailto:tom at electricdruid.net>> wrote:
>>>>>
>>>>>  The list strips attachments. Can you post a link?
>>>>>>
>>>>>>
>>>>>>  On 23 Oct 2018, at 08:30, Quincas Moreira <quincas at gmail.com
>>>>>>>  <mailto: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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>>>>>>
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>
>
> --
> Quincas Moreira
> Synth Diy Guy
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