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 Forum index » DIY Hardware and Software
DrooOone Circuits
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PHOBoS



Joined: Jan 14, 2010
Posts: 1704
Location: Moon Base
Audio files: 346

PostPosted: Wed Jun 15, 2011 8:20 am    Post subject: DrooOone Circuits
Subject description: here's some of mine post yours!
Reply with quote  Mark this post and the followings unread

Ohm...

Recently egasimus asked how to make a common detune control for
multiple 40106 oscillators
. One obvious thing that came to mind was
using vactrols. Of course the oscillators won't detune exactly the same
which can be very useful for creating droney sounds.

My initial idea was to take a PWM controlled 10mm LED and place 6 LDR's
around them controlling 6 oscillators (40106). I did some experiments and
eventually ended up with using only 2 vactrol controlled (or is that vactrolled ?!)
oscillators.

So here's the first circuit: "3240106 Droner"
- It has 2 oscillators to set a base drone one of which is slowly and slighty
modulated by a triangle wave provided by a third oscillator.

- Then there are the 2 vactrolled oscillators. The vactrols are driven by
a PWM controller which in turn is also modulated by a triangle wave.
Modulation depth and speed can be adjusted. The 100k trimpot is to set
the offset to get a nice vactrol responce. I made mine from a ordinary
5mm red LED, a LDR and a piece of heat-shrink tubing.

- The oscillators are passively mixed together using resistors and I added
a small cap to make the sound less harsh.

The enclosure is probably temporary as I'm planning to build a couple of
drone ciruits and put them together in a box with a mixer, delay, filter and
what else might be useful to create some nice drones (tips are welcome!)
I'm thinking of adding a cheap circuit bent keyboard aswell.

here's the schematic, a photo and some demos:


3240106 Droner.gif
 Description:
PHOBoS - 3240106 Droner schematic
 Filesize:  62.27 KB
 Viewed:  290 Time(s)
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3240106 Droner.gif



3240106 Droner.jpg
 Description:
PHOBoS - 3240106 Droner build
 Filesize:  32.26 KB
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3240106 Droner.jpg



PHOBoS - 3240106 Droner Demo - hands off (Jun. 11, 2011).mp3
 Description:
Letting it drone on it's own

Download
 Filename:  PHOBoS - 3240106 Droner Demo - hands off (Jun. 11, 2011).mp3
 Filesize:  2.48 MB
 Downloaded:  262 Time(s)


PHOBoS - 3240106 Droner Demo - pots (Jun. 11, 2011).mp3
 Description:
Turning some knobs

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 Filename:  PHOBoS - 3240106 Droner Demo - pots (Jun. 11, 2011).mp3
 Filesize:  5.39 MB
 Downloaded:  246 Time(s)


PHOBoS - 3240106 Droner Demo - delay (Jun. 11, 2011).mp3
 Description:
delay added

Download
 Filename:  PHOBoS - 3240106 Droner Demo - delay (Jun. 11, 2011).mp3
 Filesize:  2.14 MB
 Downloaded:  224 Time(s)


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PHOBoS



Joined: Jan 14, 2010
Posts: 1704
Location: Moon Base
Audio files: 346

PostPosted: Wed Jun 15, 2011 8:48 am    Post subject: XOR Stereo Droner Reply with quote  Mark this post and the followings unread

For the second droner I experimented with a XOR ringmod, which resulted
in the following circuit: "XOR Stereo Droner"
- as with the previous circuit this one also has 2 oscillators to set a base
drone, but this time both are slowly and slighty modulated by a triangle
wave. The outputs are attached to an XOR. What I didnt know before is
that if you add an LED to the output it will fade in and out in sync with the
frequency shifting produced by the 2 oscillators. So this is also very
usefull to use in future drone circuits as an indicator.

- I used this fading effect to modulate a third oscillator which is also XOR'd (?)
with the other 2 oscillators.

- with so many outputs and a spare inverter I decided to make a stereo
version. Mixing is done in the same way as the previous circuit but I did
use different resistor values for the XOR outputs and the direct oscillator
outputs.

schematic, a photo and some demos:


XOR Stereo Droner.gif
 Description:
PHOBoS - XOR Stereo Droner schematic
 Filesize:  59.5 KB
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XOR Stereo Droner.gif



XOR Stereo Droner.jpg
 Description:
PHOBoS - XOR Stereo Droner build
 Filesize:  34.48 KB
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XOR Stereo Droner.jpg



PHOBoS - XOR Stereo Droner Demo - hands off (Jun. 11, 2011).mp3
 Description:
Letting it drone on it's own

Download
 Filename:  PHOBoS - XOR Stereo Droner Demo - hands off (Jun. 11, 2011).mp3
 Filesize:  5.02 MB
 Downloaded:  235 Time(s)


PHOBoS - XOR Stereo Droner Demo - pots (Jun. 11, 2011).mp3
 Description:
Turning some knobs

Download
 Filename:  PHOBoS - XOR Stereo Droner Demo - pots (Jun. 11, 2011).mp3
 Filesize:  3.66 MB
 Downloaded:  232 Time(s)


PHOBoS - XOR Stereo Droner Demo - delay (Jun. 11, 2011).mp3
 Description:
Delay added

Download
 Filename:  PHOBoS - XOR Stereo Droner Demo - delay (Jun. 11, 2011).mp3
 Filesize:  6.36 MB
 Downloaded:  210 Time(s)


_________________
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http://phobos.000space.com/ http://www.acidtrash.com/ Stickney Synthyards
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PHOBoS



Joined: Jan 14, 2010
Posts: 1704
Location: Moon Base
Audio files: 346

PostPosted: Wed Jun 15, 2011 8:56 am    Post subject: Reply with quote  Mark this post and the followings unread

If anybody has some nice drone circuits please post them.
here's some that are probably well known:
beavisaudio Heterodyne Space Explorers
Casper Electronics Drone Lab V2

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tjookum



Joined: May 25, 2010
Posts: 353
Location: Netherlands
Audio files: 26

PostPosted: Sat Jun 25, 2011 1:19 pm    Post subject: Reply with quote  Mark this post and the followings unread

Awesome stuff Phobos!

Almost missed this one since I rarely venture outside the lunetta forum...

I really like your ideas and your schematics look great, definately going on my backlist. And about controlling the offset, have you seen this?
http://electro-music.com/forum/topic-48083.html
I think that is a beatifull way of making a drone with minimal controls.


I've also been heavily focussed on Drones lately and they are just endless fun. Im working on the second version of my Organ Dronor and Im really learning a lot about filters and mixing. One of my favorites is to mix the oscillators together with diodes instead of resistors, really adds more flavour.

I don't have a finished schematic but I added a little taste of the dronor. Im using some very old diodes from a power supply wich tends to sustain the drone longer but any diode will do. The little added circuitry in grey changes the output from ramp to triangle to saw. You can also add diodes across the variable resistors on the oscillators with the same effect.

here are some of my drone explorations:


and a lot of recordings, some more succesfull then others:
the Organ Dronor by Tropical Benny


organ dronor V2.1.png
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organ dronor V2.1.png



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v-un-v
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Joined: May 16, 2005
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PostPosted: Sun Jun 26, 2011 1:17 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks very much for posting these Phobos. I've been lusting after a nice drone box ever since I clapped ears on the Drone Commander. I'd love one of those, but not at that price Crying or Very sad
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