DDSR

BugBrand · Post by **BugBrand** » Sun Dec 24, 2017 3:02 pm

Wishing you all Happy Christmas!

Richard's 'show your bug' post reminded me that I wanted to share pics of this new prototype which is very fun to play.

It has taken me a few years of trying out various shift-reg ideas to arrive at something I think is quite playable - I still haven't mastered it into full control, but it chucks out all manner of interesting rhythm (via the gates) and clocked modulations (via the D to A outs).

It is dual / mirrored. I tried out a single one in 1FW and found it too cramped.
Each Shift Reg has clock and data inputs.
Data goes through an XOR gate which can recombine one of the gate outs to provide looping.
The Data and XOR switches (with Logic HI/LO and external feed) allow the data to behave in various ways.
Each side has two Digital-to-Analogue circuits summing the step outputs to give stepped waveforms (0-10V). [one sums four of the steps, the other sums all eight - so each output gives different results]

While I show it here in a standalone enclosure, I'm imagining it more with other modules - can work with things like the (soon) Chirper, but I'm dreaming of complimentary modules to build up full frames in a slightly different way to the SynthVoice.

Things like demos and block diagram after Christmas.

***update - June2018 --- rough demo:::
[video][/video]

tIB · Post by **tIB** » Sun Dec 24, 2017 3:08 pm

Ooh interesting- I probably need to hear a demo so I can figure it exactly what it does... I'm thinking funk?! Happy Christmas Tom!

leeski · Post by **leeski** » Sun Dec 24, 2017 3:09 pm

ninGiaBoom · Post by **ninGiaBoom** » Sun Dec 24, 2017 4:20 pm

That's the Bugbrand i know and i

appreciate the most: future proof and overall cool stuff that you rarely find around

Happy holidays everybody

Merry Christmas and Cheers

chrisdermo · Post by **chrisdermo** » Sun Dec 24, 2017 4:52 pm

Wowza!

a100user · Post by **a100user** » Sun Dec 24, 2017 4:59 pm

Great to see something new Tom. Would love to see and hear in action.

fredguy · Post by **fredguy** » Sun Dec 24, 2017 6:56 pm

Looks like hours of rhythmic fun. Can't wait to hear demos.

Happy holidays to all in bugland

depth20 · Post by **depth20** » Sun Dec 24, 2017 8:58 pm

OMFG!!!! Would Love such a thing in a seperate enclosure!!

numan7 · Post by **numan7** » Sun Dec 24, 2017 9:32 pm

what a beautiful arrangement of led indicators - really looking forward to seeing DDSR in action!

cheers

Illwiggle · Post by **Illwiggle** » Mon Dec 25, 2017 1:23 am

Wow exciting stuff Tom!! Very inspiring, for real.

T. Jervell · Post by **T. Jervell** » Mon Dec 25, 2017 2:31 am

Looks very promising indeed

Very very cool!! Nice Work Tom

Happy holidays.

indexofmetals · Post by **indexofmetals** » Mon Dec 25, 2017 2:34 am

hi Tom,

I can see plenty of uses for this! Looking forward to more details.

BananaPlug · Post by **BananaPlug** » Mon Dec 25, 2017 9:15 am

Nice to see this. Looking forward to details and demo. I like the decision to make it a dual but I can’t stand mirrored layouts. They work against “muscle memory.”

chrisdermo · Post by **chrisdermo** » Mon Dec 25, 2017 11:33 am

This looks like it'd be so fun with a chirper, are those buttons at the bottom where it says data jam?

shortsleeves · Post by **shortsleeves** » Tue Dec 26, 2017 10:54 am

chrisdermo wrote:This looks like it'd be so fun with a chirper, are those buttons at the bottom where it says data jam?

I think these are LED's rather than buttons.

Cheers,
Lukasz

T. Jervell · Post by **T. Jervell** » Tue Dec 26, 2017 11:44 am

shortsleeves wrote:
chrisdermo wrote:This looks like it'd be so fun with a chirper, are those buttons at the bottom where it says data jam?
I think these are LED's rather than buttons.

Cheers,
Lukasz

Are you sure? Looks like buttons to me (the two red ones above the red+green leds). Makes sens re: the discusson on double knots pusbuttons/BugBrand sequencer talk, in another thread. But who knows. I’m sure Tom will chime in over the holidays

chrisdermo · Post by **chrisdermo** » Tue Dec 26, 2017 12:09 pm

T. Jervell wrote:
shortsleeves wrote:
chrisdermo wrote:This looks like it'd be so fun with a chirper, are those buttons at the bottom where it says data jam?
I think these are LED's rather than buttons.

Cheers,
Lukasz
Are you sure? Looks like buttons to me (the two red ones above the red+green leds). Makes sens re: the discusson on double knots pusbuttons/BugBrand sequencer talk, in another thread. But who knows. I’m sure Tom will chime in over the holidays

Yep that's what I thought! Makes sense in conjunctions with the toggles higher up?

KNYST · Post by **KNYST** » Wed Dec 27, 2017 3:47 am

Very cool.

Happy hollidays!

BugBrand · Post by **BugBrand** » Wed Dec 27, 2017 9:38 am

Thanks! Good to hear there's some interest - I will try to do some clear demos later this week (the plays I had before Christmas went complex too quickly because of the fun of playing - though I may extract some snippets)

I updated the original post with a Block Diagram (single Shift-Reg) which hopefully clarifies inc. about the JAM button.

Mirrored layout - while I understand the theory of not liking such an approach, I'm not sure it is a problem in actuality.

BananaPlug · Post by **BananaPlug** » Wed Dec 27, 2017 10:14 am

This just was not computing for me but the block diagram helps a lot. It's finally dawned on me that those knobs are Switches! That explains the 1-8 numbering. I'm still a bit muddled about the right hand end of the digram.

Each side has two Digital-to-Analogue circuits summing the step outputs to give stepped waveforms (0-10V). [one sums four of the steps, the other sums all eight - so each output gives different results]

So do the 1-8 switches cause the D to A bits to be latched when the selected stage of the shifter is high? Functioning like an S&H?

Tom explained and I realize I'd misunderstood direction implied by diagram's kinky lines between knob and D to A.

BugBrand · Post by **BugBrand** » Wed Dec 27, 2017 10:20 am

You may be overcomplexifying!?

It is an 8 stage shift reg. Data is sampled on the rising clock edge and each clock event shifts the outputs along one. [so like a clocked logic delay]

The rotary switches select stage 1 through 8.
The D-to-A is independent of the rotary switches - just summing (via R2R network) combinations of the 8 shift-reg outs.

chrisdermo · Post by **chrisdermo** » Wed Dec 27, 2017 10:52 am

Doesn't quite compute for me either BUT I don't fully understand shift registers anyway, but an confident a demo would clear that up same as it did for double knot. Glad it has buttons for jamming with the rhythms looks like so much fun!

BananaPlug · Post by **BananaPlug** » Wed Dec 27, 2017 11:41 am

chrisdermo wrote:Doesn't quite compute for me either BUT I don't fully understand shift registers anyway, but an confident a demo would clear that up same as it did for double knot. Glad it has buttons for jamming with the rhythms looks like so much fun!

I'm sure it'll be fun, but the visuals may be sending the wrong messages. The choice of jack color: I'd think "stepped waveforms (0-10V)" would be on blue jacks and red jacks would only be gate signals. Repetition of legends is minimized but the horizontal white lines (spanning this dual module) can inadvertently imply functional connection rather than similar purpose. On the other hand vertical white lines do indicate functional connection.

Hope I'm not getting too far into the weeds. Just trying to help.

phisynth · Post by **phisynth** » Wed Dec 27, 2017 11:42 am

looks nice ! Is it comparable / different from the rungler part (and bits out on the expanded version) of the benjolin circuit ?

Tajnost · Post by **Tajnost** » Wed Dec 27, 2017 8:15 pm

Looks exciting! Looking forward to hear it soon)

MOD WIGGLER

MOD WIGGLER

DDSR

DDSR