[sdiy] BBD clock bleed

Dave dlmanley at sonic.net
Tue Oct 23 17:15:35 CEST 2018


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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