[sdiy] Delays and companders

Tim Ressel timr at circuitabbey.com
Mon Mar 4 22:25:49 CET 2019

This is a bit ironic. My goal on this project is to see just how clean I 
can make a BBD delay. In doing so I may wind up nuking "that BBD sound" 
people fawn over. Eh, so be it. I'm on a mission here.

--Tim (Engineer Templar) Ressel

On 3/4/2019 1:16 PM, Ben Bradley wrote:
> You're obviously making a little fun of this, but it's remarkable how
> much we use specific things (even specific part numbers for BBDs)
> because of "the sound" they give.
> I had a Minimoog decades ago. I had read an article in Keyboard
> Magazine that the filter input starts to distort if you turn an
> oscillator's mixer level past 8, so I always kept it at 8 rather than
> going to 10. But (what seemed unrelated at the time) I didn't feel I
> was satisfied with the sounds I got out of the thing.
> I've experienced and heard of lots of examples of this, some more
> subtle than others. I recently heard of "real" Hammond player coming
> in to a showroom, playing the modern Hammond/Suzuki keyboards with
> electronically generated tones, and after a couple minutes saying "the
> sound just isn't there" compared to the old Hammonds with the original
> mechanical tonewheel generators.
> On Mon, Mar 4, 2019 at 3:55 PM Richie Burnett
> <rburnett at richieburnett.co.uk> wrote:
>>> From: Ben Bradley
>>> Perhaps better is using a small microcontroller with built-in A-D and
>>> D-A  to delay the VCA control voltage. The controller's clock can be
>>> derived from the same clock as the BBD, so they would stay in sync
>>> over various delay times.
>> Or just add some external RAM, then delay the audio digitally and enjoy
>> lower distortion and a lower noise floor ;-)
>> -Richie.
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--Tim Ressel
Circuit Abbey
timr at circuitabbey.com

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