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Cynosure
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Joined: Dec 11, 2010 Posts: 966 Location: Toronto, Ontario - Canada
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Posted: Sat May 28, 2011 9:26 am Post subject:
Creating fifths using CMOS IC's |
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Is there an easy way to create 5ths from a square wave using CMOS circuits?
I would like to have a switch that when turned on will mix the 5th with the original note.
I know that a 4040 can divide by half down, is there any way to increase the clock rate up instead?
The other option is to play the 5th with the source signal and divide down to the 1st instead, but 4040 divides by whole octaves. Is it possible to mix the outputs of some of the 4040 divisions to create notes between octaves? |
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egasimus
Joined: Feb 11, 2011 Posts: 113 Location: Bulgaria
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Posted: Sat May 28, 2011 10:07 am Post subject:
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This? |
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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: Sat May 28, 2011 10:13 am Post subject:
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Yes, I think that is exactly what I am looking for. I think I have a 4046 kicking around here somewhere too. Thanks! |
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Psyingo
Joined: Jun 11, 2009 Posts: 248 Location: Canada
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Posted: Sat May 28, 2011 2:55 pm Post subject:
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or you could use a 4017 decade counter. take the signal from the 0 output (the first) and set the reset from whatever output to create odd divisions. this will divide down though, obviously... but scott g's is a good one.. |
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Top Top
Joined: Feb 02, 2010 Posts: 266 Location: California
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Posted: Sun May 29, 2011 3:41 am Post subject:
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Simplest way is to take two 4017 dividers and have one divide by 4, one by 3. The /3 will be a 5th up from the /4.
But if you need to use the original signal as the fundamental, then you need to get fancy. _________________ ∆ A.M.P. ESOTERIC ELECTRONICS ∆ |
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droffset
Joined: Feb 02, 2009 Posts: 515 Location: London area
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Psyingo
Joined: Jun 11, 2009 Posts: 248 Location: Canada
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Posted: Sun May 29, 2011 3:07 pm Post subject:
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oh and it should be mentioned that the 4017 methods alter the puslewidth so it will no longer be a square |
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richardc64
Joined: Jun 01, 2006 Posts: 679 Location: NYC
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Posted: Mon May 30, 2011 9:30 am Post subject:
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It should also be mentioned that "Do"/3 = an out-of-tune "Fa", not "Sol" -- unless you want to consider the /3 as the root, in which case the note being divided becomes an out-of-tune "Sol."
(C)2093.004Hz/3 = 697.688Hz; not quite (F) 698.456Hz
This is why top octave generators divide by 9 bit numbers. _________________ Revenge is a dish best served with a fork... to the eye |
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Gordon Charlton
Joined: Oct 07, 2006 Posts: 75 Location: UK
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Posted: Mon May 30, 2011 10:20 am Post subject:
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richardc64 wrote: | It should also be mentioned that "Do"/3 = an out-of-tune "Fa", not "Sol" -- unless you want to consider the /3 as the root, in which case the note being divided becomes an out-of-tune "Sol."
(C)2093.004Hz/3 = 697.688Hz; not quite (F) 698.456Hz
This is why top octave generators divide by 9 bit numbers. |
"out of tune" for an even tempered scale. In just intonation it's spot on.
_________________ I am beat frequency.
sinister dexterity |
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Cynosure
Site Admin
Joined: Dec 11, 2010 Posts: 966 Location: Toronto, Ontario - Canada
Audio files: 82
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Posted: Tue May 31, 2011 6:47 pm Post subject:
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This is all great info. I got lots to work with now. Thanks! |
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JovianPyx
Joined: Nov 20, 2007 Posts: 1988 Location: West Red Spot, Jupiter
Audio files: 224
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Posted: Wed Jun 01, 2011 10:42 am Post subject:
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Gordon Charlton wrote: | richardc64 wrote: | It should also be mentioned that "Do"/3 = an out-of-tune "Fa", not "Sol" -- unless you want to consider the /3 as the root, in which case the note being divided becomes an out-of-tune "Sol."
(C)2093.004Hz/3 = 697.688Hz; not quite (F) 698.456Hz
This is why top octave generators divide by 9 bit numbers. |
"out of tune" for an even tempered scale. In just intonation it's spot on.
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Indeed it is "out of tune" with respect to even temper. It is actually a "perfect fifth" which will beat nicely and pleasantly against the even tempered fifth meaning that you can mix the F/3 tone with the F tone and get a nice sound (IMO). I think it will "fatten" the sound. _________________ FPGA, dsPIC and Fatman Synth Stuff
Time flies like a banana. Fruit flies when you're having fun. BTW, Do these genes make my ass look fat? corruptio optimi pessima
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