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Vactrol chiptune squarewave osc (w/ audio and schematic)
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Author Vactrol chiptune squarewave osc (w/ audio and schematic)
Tombola
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Joined: 23 Jan 2011
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PostPosted: Wed May 04, 2011 4:24 pm    Post subject: Vactrol chiptune squarewave osc (w/ audio and schematic) Reply with quote Add User to Ignore List

13 components, based on hex schmitt trigger, lives up to its name.
Will post schem and audio...


Last edited by Tombola on Thu May 05, 2011 8:50 am; edited 2 times in total
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J3RK
Super Deluxe Wiggler


Joined: 22 Dec 2009
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PostPosted: Wed May 04, 2011 4:41 pm    Post subject: Reply with quote Add User to Ignore List

I'd love to see these!
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gde
anti-zarzutzki


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PostPosted: Wed May 04, 2011 5:19 pm    Post subject: Reply with quote Add User to Ignore List

it has an interesting proximity to the quantizer....
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falafelbiels
still learning to wiggle


Joined: 04 Aug 2009
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PostPosted: Thu May 05, 2011 3:09 am    Post subject: Reply with quote Add User to Ignore List

Audio or it just barely exists...
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falafelbiels
still learning to wiggle


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PostPosted: Thu May 05, 2011 3:11 am    Post subject: Re: Vactrol chiptune squarewave osc Reply with quote Add User to Ignore List

Tombola wrote:

Will post schem and audio...


falafelbiels wrote:
Audio or it just barely exists...


Whoops, sorry bout that.....
patience is not a virtue of mine so much that I don't take the time to read on these here forums. I just watch the pretty pictures and shout a lot.
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Jarno
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PostPosted: Thu May 05, 2011 4:29 am    Post subject: Reply with quote Add User to Ignore List

falafelbiels wrote:
...and shout a lot.


Confirming the public opinion on people from your particular city. Mr. Green
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falafelbiels
still learning to wiggle


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PostPosted: Thu May 05, 2011 4:50 am    Post subject: Reply with quote Add User to Ignore List

FEYENOORD! HOOLIGANS!
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Pfurmel
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PostPosted: Thu May 05, 2011 5:25 am    Post subject: Reply with quote Add User to Ignore List

This looks very promising indeed
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Tombola
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PostPosted: Thu May 05, 2011 5:44 am    Post subject: Reply with quote Add User to Ignore List

gde wrote:
it has an interesting proximity to the quantizer....


It definitely DOESN'T track 1v/oct!
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Tombola
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PostPosted: Thu May 05, 2011 6:15 am    Post subject: Reply with quote Add User to Ignore List

Here's the schematic and a pic, including very chic black electrical tape vactrol. It has one LED and two LDRs. I used different brands of LDR to make the second osc track differently from the first.

In this rather poor demo, the first sound is a good oscillator (RS-95e) to give an idea of the random CV going into the osc. It then switches to the bad oscillator. The notes explain what's going on

http://soundcloud.com/musicthing/bad-osc-test

[s]http://soundcloud.com/musicthing/bad-osc-test[/s]




DIY vactrol oscillator by Tom.Whitwell, on Flickr


Last edited by Tombola on Thu May 05, 2011 10:23 am; edited 2 times in total
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falafelbiels
still learning to wiggle


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PostPosted: Thu May 05, 2011 8:25 am    Post subject: Reply with quote Add User to Ignore List

Very... Cool...

Even without audio...
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iopop
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PostPosted: Thu May 05, 2011 9:01 am    Post subject: Reply with quote Add User to Ignore List

Lovely!

Thanx for posting the schema.
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CLee
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PostPosted: Thu May 05, 2011 9:50 am    Post subject: Reply with quote Add User to Ignore List

very cool. I'm just starting to mess around with Vactrols... they are very strange beasts indeed.

I don't know if I'm totally following what the switch does.

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Tombola
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PostPosted: Thu May 05, 2011 10:11 am    Post subject: Reply with quote Add User to Ignore List

CLee wrote:
I don't know if I'm totally following what the switch does.


The 40106 is six squarewave oscs in a chip. I'm using two, each tuned by a separate LDR. One LED shines on both LDRs.

One osc goes to the output, via resistor.

The second osc goes to the switch. Three possible states are:

OFF - only the first osc sounds

Down - the second osc goes to the output via a resistor, so is essentially mixed with the first osc. You hear two distinct tones.

Up - the second osc goes to the output via a diode, which means it influences the first osc in strange ring-mod ish ways. At low frequencies, it sort of pulses the other osc on and off.

I should really build a version with all six oscs going and a big bank of switches.
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Pfurmel
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PostPosted: Thu May 05, 2011 10:18 am    Post subject: Reply with quote Add User to Ignore List

I can't wait to hear this thing, cool design.
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falafelbiels
still learning to wiggle


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PostPosted: Thu May 05, 2011 10:35 am    Post subject: Reply with quote Add User to Ignore List

And with audio still very cool... It's a cool thing! Great project for next Monday's soldering workshop, thanks man w00t
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Rod Serling Fan Club
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Joined: 14 Dec 2009
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PostPosted: Thu May 05, 2011 10:45 am    Post subject: Reply with quote Add User to Ignore List

Tombola wrote:

I should really build a version with all six oscs going and a big bank of switches.


That could be interesting. Something similar to the Cloud Generator with spread for each osc (if possible?) but in lo-fi square wave form could be a very fun noise maker.

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Jarno
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PostPosted: Thu May 05, 2011 11:30 am    Post subject: Reply with quote Add User to Ignore List

falafelbiels wrote:
FEYENOORD! HOOLIGANS!


ROFL!
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SMS303
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PostPosted: Thu May 05, 2011 12:56 pm    Post subject: Reply with quote Add User to Ignore List

falafelbiels wrote:
And with audio still very cool... It's a cool thing! Great project for next Monday's soldering workshop, thanks man w00t

okay i allready know what we will do next monday thumbs up

Jarno wrote:
falafelbiels wrote:
FEYENOORD! HOOLIGANS!

ROFL!

da kannie hé!
jij bent geimporteerd uit Braboland help

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fengland
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PostPosted: Mon May 09, 2011 3:25 pm    Post subject: Reply with quote Add User to Ignore List

I like the slew on the pitch change. sweet.
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