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Vactrol chiptune squarewave osc (w/ audio and schematic)
MUFF WIGGLER Forum Index -> Music Tech DIY Goto page 1, 2, 3  Next [all]
Author Vactrol chiptune squarewave osc (w/ audio and schematic)

Tombola

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


J3RK

I'd love to see these!


gde

it has an interesting proximity to the quantizer....


falafelbiels

Audio or it just barely exists...


falafelbiels

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.


Jarno

falafelbiels wrote:
...and shout a lot.


Confirming the public opinion on people from your particular city. Mr. Green


falafelbiels

FEYENOORD! HOOLIGANS!


Pfurmel

This looks very promising indeed


Tombola

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


It definitely DOESN'T track 1v/oct!


Tombola

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


falafelbiels

Very... Cool...

Even without audio...


iopop

Lovely!

Thanx for posting the schema.


CLee

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.


Tombola

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.


Pfurmel

I can't wait to hear this thing, cool design.


falafelbiels

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


Rod Serling Fan Club

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.


Jarno

falafelbiels wrote:
FEYENOORD! HOOLIGANS!


ROFL!


SMS303

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


fengland

I like the slew on the pitch change. sweet.


JP

Someone needs to make a pcb for this insanity.


ringstone

40106 / 14584 square wave oscs (6 detuned for a complex metallic waveform) are pretty much in every 808/606 type hihat/cymbal voice... and also 808 cowbell smile


lazerkind

Nice, what kind of LDR's are you using?
There are many different ranges of LDR's to choose from so just a hint of min/max resistance would be great.
//L


Tombola

lazerkind wrote:
Nice, what kind of LDR's are you using?


I literally pulled a couple at random from a bunch I ordered from Banzai. I don't think it's that critical, as the module really doesn't track with any accuracy. As I said above, I'd probably get a roughly matching pair if I was doing it again.

I'd also probably put slightly bigger caps in the oscillators - in use, it kind of crashes at the bottom end (I assume when LED drops out as the voltage goes below 1.5v) - which is quite a cool effect, but makes it harder to use the oscillator for bass, while there's a lot of more controllable range higher up that I'm less likely to use.


falafelbiels

Hey I made this at solder workshop tonight and it is really cool sounding, espacially the "ring" type effect. Casper was about to give up on this, but when he heard it, he decided to definitely finish it next week. Must be a cool thing then, eh?

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