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dnny
Joined: Mar 12, 2005 Posts: 519 Location: Helsinki, Finland
Audio files: 8
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Posted: Wed Feb 01, 2006 1:06 pm Post subject:
mini WSG - the Dual Tone Generator "DTG" from Ben Subject description: get nice noise from 40106 |
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if you have some parts (five 50K pots, two 1uF caps and 40106) and some time you will soon have the noise going on.
try this Dual Tone Generator that Ben posted on experimentalistsanonymous.com-forum
and here is how to run those wires
and here is my DTG
see its really simple.
there are also sound samples on experimentalistsanonymous.com-forum
daniel |
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Macaba
Joined: Jul 13, 2005 Posts: 160 Location: UK
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Posted: Wed Feb 01, 2006 1:36 pm Post subject:
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I noticed the sacred word 'Sine' was invoked a few times.
Does this thing generate a sinisoidal type wave? |
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dnny
Joined: Mar 12, 2005 Posts: 519 Location: Helsinki, Finland
Audio files: 8
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Posted: Wed Feb 01, 2006 2:43 pm Post subject:
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i dont have a scope but, i can hear that is not the same symmetrical beatifull sine-wave that we all know . _________________ Association of experimental electronics
www.koelse.org
flickr: cable porn group |
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Scott Stites
Janitor
Joined: Dec 23, 2005 Posts: 4127 Location: Mount Hope, KS USA
Audio files: 96
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Posted: Wed Feb 01, 2006 3:01 pm Post subject:
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It's not a sine wave, but one way to eke out a different waveform from a standard CD40106 oscillator as found in the WSG is to put a high impedance buffer on the filter cap itself. You get more of a rampoid kind of thing there - different set of harmonics to run through the filter. I didn't do it on my Wacky Mods because I wanted to keep the core of the circuit pristine and not add any IC's. Dang - gotta finish the crunchy mods documentation.....
If you really, really, really want some far out freak from a CD40106, get a CD4030 or 4070 quad EXOR. Each EXOR acts as a sort of digital ring modulator. Run all sections of your CD40106 in the audio range, keep them individually controllable, and ring modulate the oscillators with the CD4070. You can use up all six of the oscillators with three of the EXOR gates, and have one left over to mix either the outputs of two of the other ring modulators into it, or just a different set of oscillators not already joined at the hip in some other RM section.
Ring modulating the oscillators of a CD40106 with an EXOR is a common way to get 'pitched noise', used in things such as cymbal, chime and gong simulators. Making each oscillator individually controllable is a ticket to outer space, especially if you put them under voltage control with, oh, say, Vactrols.
I went through a flirtation with this a while back. A schematic (which certainly could be improved on) and sound samples can be found here:
http://mypeoplepc.com/members/scottnoanh/slsdiy/id18.html
Scroll down to 11 April 2004 and 13 April 2004.
Take care,
Scott |
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toppobrillo
Joined: Dec 10, 2005 Posts: 766 Location: oakland, ca
G2 patch files: 1
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Posted: Wed Feb 01, 2006 7:42 pm Post subject:
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hey cool samples on your page scott.
i saw that circuit used in the 'synbal' or something like that. with a voltage follower to the supply pin to tune all 6 osc's together, having their freq. ratios preset. a sweepable 'spread' would be superduper.
herer is a picture of a small unit, [dismantled -cut up.. really, witha big saw- fender powered mixer that was destroyed by somethin' fierce like lightniing perhaps?] ready to be a somethin' or another 6x4 50k linear pots with cool knobs. i had originally thought A. like a 'percussion' synthesizer type box with 4 channels operating independently, externally triggered and CVed or B. something else.
all 50ks... hmm i was like huh. i was discouraged a little by the thought of limited range of certain elements of this idea. (A.) i first thought of using LDR type of ideas, but recent developments in the 'simple VCLFO dept' have given me new hopes and idea'rs.
so yeah now a "voltage controlled-voltage source" thing for the synbal circuit [when i first heard of that i was like ?] and a sweepable 'spread' and perhaps ill get on with this project.
oh i've got one of them 5837 shift reg. noise ICs too.. thatl be cool to hook up to a vc clock. somethin' fierce! |
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Scott Stites
Janitor
Joined: Dec 23, 2005 Posts: 4127 Location: Mount Hope, KS USA
Audio files: 96
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Posted: Thu Feb 02, 2006 1:23 pm Post subject:
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Wow! That would be a nice thing to have around - I like your drum idea about it. You could have your tunable CD40106 in there as well - or a couple of them even. They could do double duty for high-hats or cymbals.
Ken Stone's Cynare uses the same setup for the 'shimmer' oscillator. In fact, IIRC, he left extra pads for pots so that one could individually tune each oscillator. Cool thing about that is, it also has a Steiner VCF on board.
http://www.cgs.synth.net/modules/cgs47_cynare.html
It's got the regular reverse biased transistor noise on it - you could add your noise chip for additional effect. The box could produce both percussion and space sounds using something along those lines.
A couple of those, his dual drum board and chime simulator would be nice basis for a cool perc box. I've played with the Cynare and the dual drum (just a simple but effective twin t type thing) using his voltage divider and have gotten some neat drum things going. I have the chime simulator board, but have done nothing with it.
Take care,
Scott |
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benfox
Joined: Feb 03, 2006 Posts: 14 Location: france
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