[sdiy] BBD clock bleed

Quincas Moreira quincas at gmail.com
Tue Oct 23 17:33:22 CEST 2018


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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