[sdiy] BBD clock bleed

Dave dlmanley at sonic.net
Tue Oct 23 17:29:04 CEST 2018


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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