[sdiy] BBD clock bleed

Quincas Moreira quincas at gmail.com
Tue Oct 23 15:36:25 CEST 2018


I’ve thought of using na integrator to derive a triangle from the clock pulse, then an OTA to distort it into a sine, then invert it and sum it to the BBD output thus cancelling most of the bleed but now we’re talking a full on daughterboard, lol

Sent from my iPad

> On Oct 23, 2018, at 8:12 AM, Tom Bugs <admin at bugbrand.co.uk> wrote:
> 
> There appears to be minimal input and output filtering also.
> 
> 
>> On 23/10/2018 14:07, Vladimir Pantelic 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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