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 Forum index » DIY Hardware and Software
The DoubleDeka Ultrasonic VCO
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frijitz



Joined: May 04, 2007
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PostPosted: Thu Aug 28, 2008 6:43 pm    Post subject: The DoubleDeka Ultrasonic VCO
Subject description: Get on the bus!
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The DoubleDeka is my new VCO. From the forthcoming documentation:

"This unique VCO consists of an ultrasonic oscillator core followed by a parallel pair of waveform generators.
Each waveform generator consists of a switched multi-octave divider followed by circuitry to generate a 10-step
waveform using a set of 10 slider potentiometers. Also included are a novel synchronization circuit with two
different operating modes and a built-in "digital ring modulator" (DRM) for producing a wide variety of
synchronized and anharmonic sounds. The oscillator core is highly stable (better than 20 ppm/K in the
prototype) and features wide-range, accurate tracking (better than 0.05% over fifteen octaves). The variable
waveform generator provides fine control over an enormous range of available timbers."

PCBs have been tested and will be available -- along with kits and panels -- from bridechamber.com.

For now here are some demos:

demo01 -- switching through the octaves and then moving the sliders around.

demo02 -- with fixed waveforms, switching through all the combinations of the octave switches.

demo03 -- a patch with the two waves fed through two VCFs.

demo04 -- four waves from two units; raw sounds without filtering.

demo05 -- sweeps of a Tri VCO fed into the the sync input (two sync modes) and then into the RM input.

(Sheesh, they were in the correct order in the preview. Has anybody figured out how the ordering works?)

Very Happy

Ian


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Last edited by frijitz on Thu Aug 28, 2008 7:08 pm; edited 1 time in total
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andrewF



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PostPosted: Thu Aug 28, 2008 7:06 pm    Post subject: Reply with quote  Mark this post and the followings unread

Sounds great Ian - especially like #3
Apart from the 10 step waveform generator, does this circuit have much in common with your one in Electronotes? or has it been implemented in a different way?

I still have that rack of 10 sliders awaiting a new home Smile
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fluxmonkey



Joined: Jun 24, 2005
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PostPosted: Thu Aug 28, 2008 7:39 pm    Post subject: Reply with quote  Mark this post and the followings unread

hot damn! i've been waiting for this one since you first hinted at it. thanks much to both you and scott!

b

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frijitz



Joined: May 04, 2007
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PostPosted: Thu Aug 28, 2008 7:51 pm    Post subject: Reply with quote  Mark this post and the followings unread

andrewF wrote:
Apart from the 10 step waveform generator, does this circuit have much in common with your one in Electronotes? or has it been implemented in a different way?
I still have that rack of 10 sliders awaiting a new home Smile

Prety much totally different. The core uses the LM331 V/F converter, specifically the high frequency version in the data sheet. The logic is all CMOS (as opposed to TTL) and so has a higher level of integration. The sync and DRM are new, and took some work to get to operate well.

The boards that will be available have the sliders and their drive circuits on one board and everything else on the other. This means that you would have to use the same slider as we are in order to use the board effectively. You could use other sliders, but then you would need all flying leads from the board to the pots. Not necessarily bad, just a bit more work.

Very Happy

Ian
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frijitz



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PostPosted: Thu Aug 28, 2008 8:00 pm    Post subject: Reply with quote  Mark this post and the followings unread

Ooops -- could somebody please delete the multiple posts. Don't know how it happened, but the server wasn't responding, so I tried several times.
Last edited by frijitz on Thu Aug 28, 2008 8:12 pm; edited 1 time in total
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Luka



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PostPosted: Thu Aug 28, 2008 8:07 pm    Post subject: Reply with quote  Mark this post and the followings unread

great! sounds awesome
this is my next vco

and i have a broken EQ rack with a nice bunch of sliders ready for using

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loss1234



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PostPosted: Thu Aug 28, 2008 9:27 pm    Post subject: Reply with quote  Mark this post and the followings unread

wow

i have been interested in this for a long while!

i guess i am going to have to learn how to drill holes for sliders!

are there schematics on the bridechamber page?

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EdisonRex
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PostPosted: Fri Aug 29, 2008 1:15 am    Post subject: Reply with quote  Mark this post and the followings unread

frijitz wrote:
Ooops -- could somebody please delete the multiple posts. Don't know how it happened, but the server wasn't responding, so I tried several times.


Server seems good now, so your wish is fulfilled... Wink

This is an interesting VCO indeed!

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bugbrand



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PostPosted: Fri Aug 29, 2008 2:02 am    Post subject: Reply with quote  Mark this post and the followings unread

Hats off to you, Ian!

This sounds (in words and audio) like a really wonderful design.
Very interesting.

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frijitz



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PostPosted: Fri Aug 29, 2008 6:30 am    Post subject: Reply with quote  Mark this post and the followings unread

loss1234 wrote:
i guess i am going to have to learn how to drill holes for sliders!
are there schematics on the bridechamber page?

The schematics will probably be available eventually. But Scott is going to have a large tooling charge to make the panel, so I want to make sure he doesn't get undercut by anyone, if you know what I mean.

It's really a pain to mount and wire up 20 sliders. I would strongly encourage folks to use the boards and panels from Scott if at all possible.

Very Happy

Ian
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loss1234



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PostPosted: Fri Aug 29, 2008 6:38 am    Post subject: Reply with quote  Mark this post and the followings unread

hold on. are you saying that if i buy the boards with the sliders i wont have to drill holes for the sliders? I dont plan on buying my own sliders. all i meant was that I was under the impression that sliders are MUCH harder to mount on a panel.

Cant wait to see how this works!!

thanks

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Scott Stites
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PostPosted: Fri Aug 29, 2008 6:43 am    Post subject: Reply with quote  Mark this post and the followings unread

Shocked Shocked Shocked

Couldn't tell you which was my favorite sample - they all rock exceedingly......

Far frikkin' out!!!!!!!!

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bugfight



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PostPosted: Fri Aug 29, 2008 7:09 am    Post subject: Reply with quote  Mark this post and the followings unread

and the mighty Queue gets ever longer....

very nice!
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frijitz



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PostPosted: Fri Aug 29, 2008 7:30 am    Post subject: Reply with quote  Mark this post and the followings unread

loss1234 wrote:
hold on. are you saying that if i buy the boards with the sliders i wont have to drill holes for the sliders?

No, that's not what I said.

Very Happy

Ian
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sduck



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PostPosted: Fri Aug 29, 2008 8:29 am    Post subject: Reply with quote  Mark this post and the followings unread

I'll trade the holes for the sliderrs for what's behind door #2, Monty.

Very Happy

Seriously, it sounds very cool - I want 2!
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loss1234



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PostPosted: Fri Aug 29, 2008 8:54 am    Post subject: Reply with quote  Mark this post and the followings unread

Ian-

sorry. I think you were responding to someone else about why they shouldn't try to buy their own sliders and i took that to be an answer to what I was asking in my head.

anyway. i am ready to learn whatever it takes to build this thing. awesome samples!

thanks

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Dego



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PostPosted: Fri Aug 29, 2008 9:06 am    Post subject: Reply with quote  Mark this post and the followings unread

I will buy 2 as soon as bridechmaber has them available Smile
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bugfight



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PostPosted: Fri Aug 29, 2008 9:57 am    Post subject: Reply with quote  Mark this post and the followings unread

uh oh, bad news.
in another thread this terrible fact was revealed:

frijitz wrote:

... But I'm sure it doesn't have any "juju", whatever that is.

Very Happy

Ian


as such, i have lost interest.
please refund my money...
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Scott Stites
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PostPosted: Fri Aug 29, 2008 10:00 am    Post subject: Reply with quote  Mark this post and the followings unread

I'm thinking the core would be up in the BBD clocking range, no?
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Peake



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PostPosted: Fri Aug 29, 2008 10:02 am    Post subject: Reply with quote  Mark this post and the followings unread

Done with love and reverence, you'll want it. Done with bad intent, you're helping to hurt the very thing that you love.

This oscillator is a welcome addition to oscillator lore, and a grand step above mere sawtooth core designs. I'd drop in 741s and a mylar cap in the core, but that's just me Wink

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jnuaury



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PostPosted: Fri Aug 29, 2008 10:08 am    Post subject: Reply with quote  Mark this post and the followings unread

im already making room for atleast two and assuming it utilizes a 4017 ill be making a slight modification... a switch to reset the 4017 after atleast the 6th and 8th steps if this goes into the lfo range ive got myself some synchorized sequencers
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Ilanode



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PostPosted: Fri Aug 29, 2008 10:15 am    Post subject: Reply with quote  Mark this post and the followings unread

frijitz wrote:
... But I'm sure it doesn't have any "juju", whatever that is.


Juju is a guitar dominated Nigerian style of pop music. Even though I've two great Juju records by Ebenezer Obey from the 1960s I think the DoubleDeka can do without.
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frijitz



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PostPosted: Fri Aug 29, 2008 11:34 am    Post subject: Reply with quote  Mark this post and the followings unread

Scott Stites wrote:
I'm thinking the core would be up in the BBD clocking range, no?

The core goes up to a bit over 100 kHz. Scott D. wants to bring the HF out to the panel, and we will probably do so. Anyway, the highest fundamental frequency that can be used is around 10 kHz. If you really need to go higher, you can split the waveforms up into two equal five step segments -- this works fine because you can't much in the way of harmonics above that.

Very Happy

Ian
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PostPosted: Fri Aug 29, 2008 11:40 am    Post subject: Reply with quote  Mark this post and the followings unread

Sweet - you could drive a two phase clock driving a BBD. It just gets better and better.

An MN3X07 would get up to 5.12 ms, which would put you in some fairly decent comb filter range.

It's a magic bus..... Very Happy

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frijitz



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PostPosted: Fri Aug 29, 2008 11:41 am    Post subject: Reply with quote  Mark this post and the followings unread

Peake wrote:
I'd drop in 741s and a mylar cap in the core, but that's just me Wink

Sure, why not. You're making my point. If you start with something stable you can always degrade it if you want. But not vice versa.

Moog used his excellent ears as part of his design process. He also used other musicians'. I have no argument whatever with anyone who wants to use his originals.

Very Happy

Ian
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