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Cynosure
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Joined: Dec 11, 2010 Posts: 966 Location: Toronto, Ontario - Canada
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Cynosure
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Kabzoer
Joined: Feb 07, 2011 Posts: 82 Location: Belgium
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Posted: Tue Oct 11, 2011 8:13 am Post subject:
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I think your distortion circuit works like Frequency Modulation.
You build an oscillator so the frequency depends on the supply voltage, wich is the sound source.
I'll try to breadboard your circuits today.
The cd4066 gate as well, I'll see if i can find something to remove the clicking! |
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Cynosure
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Joined: Dec 11, 2010 Posts: 966 Location: Toronto, Ontario - Canada
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Posted: Tue Oct 11, 2011 8:30 am Post subject:
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Thanks Kaboozer - Now I have a better understanding of what I created.
I did some searching on the 4066 issue, and found that it is just how the ic works. I'm looking now for better options to do the switching. Any suggestions?
More about the 4066 thing here:
http://electro-music.com/forum/topic-49715.html |
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sonic
Joined: Dec 02, 2010 Posts: 106 Location: Victoria BC
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Posted: Tue Oct 11, 2011 11:30 am Post subject:
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Fantastic. Thanks for posting, Cyno. I'll definitely be experimenting with these. |
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Cynosure
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Joined: Dec 11, 2010 Posts: 966 Location: Toronto, Ontario - Canada
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Cynosure
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Joined: Dec 11, 2010 Posts: 966 Location: Toronto, Ontario - Canada
Audio files: 82
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Posted: Wed Oct 12, 2011 5:46 pm Post subject:
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I solved the clicking problem by using transistors instead of the 4066. I will post the schematic once i get some to to make it. |
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Cynosure
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Joined: Dec 11, 2010 Posts: 966 Location: Toronto, Ontario - Canada
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Cynosure
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Joined: Dec 11, 2010 Posts: 966 Location: Toronto, Ontario - Canada
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jean bender
Joined: Feb 21, 2010 Posts: 139 Location: france
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Posted: Fri Oct 14, 2011 2:43 am Post subject:
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Hi everybody !
I'm sorry, but i don't really understand the way your cd40106 works when you power it by other digital or audio information, as in the first left drawing put by Cynosure in its first post.
How goes the logical information out as it is send to the +vss pin ? I've already seen this design in other parts of this forum, people say that it is made as an oscillator, but... Would be happy to get more information about it.
Also, would it work with a cd4093 ??
thanks _________________ http://h.a.k.free.fr/
www.electroncanon.org |
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Cynosure
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Joined: Dec 11, 2010 Posts: 966 Location: Toronto, Ontario - Canada
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Posted: Fri Oct 14, 2011 4:38 pm Post subject:
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deadbeat wrote: | I'm sorry, but i don't really understand the way your cd40106 works when you power it by other digital or audio information |
I really don't understand it either, but Kabzoer said that it uses frequency modulation. Here is my uneducated attempt to understand it:
The 40106 usually sends the Vdd out as a high output. Usually, that is just a power supply, so it is the power that is sent out. If the Vdd is replaced with audio, then the high state sends out the audio instead.
The circuit I showed has a schmidt trigger oscillator on pins 1 and 2. The oscillator automatically changes the output state of the chip from high to low over and over again, and the rate can be varied by the potentiometer.
Since the power has been replaced with an audio signal, you end up sending out little bits of the original sound at a very high frequency. The frequency is high enough that instead of hearing it go on and off, you hear the pulsing start to oscillate itself and interact with the source sound, creating the frequency modulated distortion.
Or I could be entirely wrong, but I'm sure someone here will correct my mistakes... |
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jean bender
Joined: Feb 21, 2010 Posts: 139 Location: france
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corex
Joined: Mar 02, 2010 Posts: 114 Location: Las Vegas
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Posted: Mon Oct 17, 2011 4:38 pm Post subject:
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That sounds more like amplitude modulation than frequency modulation, doesn't it?
It's like running an audio signal (a square wave) to a VCA's CV in. |
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Kabzoer
Joined: Feb 07, 2011 Posts: 82 Location: Belgium
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Posted: Wed Oct 19, 2011 2:10 am Post subject:
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corex wrote: | That sounds more like amplitude modulation than frequency modulation, doesn't it?
It's like running an audio signal (a square wave) to a VCA's CV in. |
I think it's both, you're right about the Amplitude modulation,
but if you have a lower voltage at the output, the cap will 'fill' slower which also results in a lower frequency.
So if you put less voltage on the power pin, not only the amplitude will drop, also the frequency. |
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squarewhite
Joined: Jun 06, 2007 Posts: 82 Location: Asia
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Posted: Tue Jan 03, 2012 3:31 pm Post subject:
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hi
which transistor did you use to kill the clicking of the 4066?
best |
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Cynosure
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Joined: Dec 11, 2010 Posts: 966 Location: Toronto, Ontario - Canada
Audio files: 82
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Posted: Tue Jan 03, 2012 6:51 pm Post subject:
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I didn't use the 4066 at all. I used 2N3904 transistors to do the switching instead. The transistor seems to be able to do it slower, and doesn't cause the click.
However, it required lowering the level of the sound a lot and then boosting it up again with an opamp. This makes it ok as a stereo effect with the source sound mixed in the center, but you wouldn't want to run the sound on its own.
There are some schematics floating around for simple crossfading VCA's that do a similar effect and don't have any clicking because they turn down the volume quickly instead of just cutting it off. It might be worth a look if you are up to a slightly more complex build, but it is outside the world of CMOS. _________________ JacobWatters.com |
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JingleJoe
Joined: Nov 10, 2011 Posts: 878 Location: Lancashire, England
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Posted: Thu Jan 05, 2012 10:00 am Post subject:
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Did you try putting filter capacitors accross the supply to the 4066? That may reduce clickyness. _________________ As a mad scientist I am ruled by the dictum of science: "I could be wrong about this but lets find out"
Green Dungeon Alchemist Laboratories |
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Cynosure
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Joined: Dec 11, 2010 Posts: 966 Location: Toronto, Ontario - Canada
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Posted: Thu Jan 05, 2012 7:17 pm Post subject:
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JingleJoe wrote: | Did you try putting filter capacitors accross the supply to the 4066? That may reduce clickyness. |
If you mean from Vdd to Vss, then yes. I tried that. It helps, but shutting the sound off abruptly will create a click no matter what is doing the switching. I think that the transistor doesn't switch as abruptly. _________________ JacobWatters.com |
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