[sdiy] VCF caps in modern synths

Michael E Caloroso mec.forumreader at gmail.com
Wed Mar 24 03:04:48 CET 2021


"I'm going to guess that these PCB were made to handle both so that
volume discounts on the board fab could be obtained."

Another guess is to resolve supply issues.  If one is out of stock,
the other can be substituted without halting production.

MC

On 3/23/21, Brian Willoughby <brianw at audiobanshee.com> wrote:
>
>
> On Mar 23, 2021, at 16:28, Gordonjcp wrote:
>> On Tue, Mar 23, 2021 at 03:15:53PM -0400, ColinMuirDorward wrote:
>>> Here is a little update to this topic.
>>> Some good people at GS have photographed the VCF section on two behri
>>> 2600
>>> versions: orange/black and grey.
>>> You can see that in orange, they used SMD ceramics, and on grey, yellow
>>> box
>>> film.
>>> Lucky for us, the orange version has empty through-hole footprints!
>>> https://www.gearslutz.com/board/attachments/electronic-music-instruments-and-electronic-music-production/953304d1616358816-behringer-2600-a-2600vs2600.jpg
>>
>> Interesting.  So are they selling a special version for the coke-addled
>> audiophools who reckon that they can hear the difference between
>> through-hole and SMD components?
>
> Not every capacitor formulation is available in all package variations.
>
> I happen to prefer SMD - not for sound but for convenience of manufacturing.
> However, certain kinds of capacitors that are ideal for Sample and Hold
> simply aren't available in SMD, so my PCB designs include placements for
> both through-hole and SMD. This way, I can try out the cheaper C0G to see if
> they hold as good as I need for the S&H refresh timing that I can achieve.
>
> I'm going to guess that these PCB were made to handle both so that volume
> discounts on the board fab could be obtained. Then, if a particular filter
> needs through-hole it's available.
>
> Brian
>
>
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