[sdiy] Lecture on BBDs & chorus & vibrato effects...

[Tom Bugs]

Me too! I've had a stash of V3207s (the Coolaudio clone) for a few years 
just waiting for me to make something nice, so this gave me a good nudge 
- I'd never really thought much about switched-capacitor filters (though 
had considered tracking filters)

Interesting note on the MW thread - 
https://modwiggler.com/forum/viewtopic.php?t=259670

"BBDs are not as "dirty" as people generally think. There are ways to 
make them sound vastly cleaner. Current-sink load on the output, and 
very sharp switched capacitor input/output filters (synced to sample 
clock), along with careful pre/de-emphasis can produce shockingly good 
results. Companders just unnecessarily mess up the signal. Current sink 
load reduces both distortion and noise quite significantly. Clock noise 
is still a significant contributor in most designs, even if not 
perceived as a "whine" or tone."

The current-sink load mention seems interesting, something to 
investigate, though I'm somewhat unsure how best to implement - the MXR 
Carbon Copy (later version with Reticons) may give a clue though:
http://experimentalistsanonymous.com/diy/Schematics/Delay%20Echo%20and%20Samplers/MXR%20Analog%20Delay%202.png

Tom

On 10/03/2022 19:03, Quincas Moreira via Synth-diy wrote:
> Loved this one Aaron, thank you so much!
>
> On Mon, Mar 7, 2022 at 6:06 PM Lanterman, Aaron D via Synth-diy 
> <synth-diy at synth-diy.org> wrote:
>
>     …with a cameo from switched-capacitor filters:
>
>     https://youtu.be/E2YLfw0qtDE
>
>     One of my earliest memories from this list is Harry Bissell
>     talking how how much BBD sucks. ;)
>
>     Aaron Lanterman, Prof. of ECE, Georgia Tech
>     My blog on Education and Innovation:
>     https://edupocalypsenow.wordpress.com
>     My blog on Electronics and Programming:
>     https://lantertronics.blogspot.com
>     My YouTube channel on Electronics and Programming:
>     https://www.youtube.com/c/lantertronics
>
>
>
>
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> Quincas Moreira
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