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 Forum index » DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Creating fifths using CMOS IC's
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Cynosure
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PostPosted: Sat May 28, 2011 9:26 am    Post subject: Creating fifths using CMOS IC's Reply with quote  Mark this post and the followings unread

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



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PostPosted: Sat May 28, 2011 10:07 am    Post subject: Reply with quote  Mark this post and the followings unread

This?
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Cynosure
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PostPosted: Sat May 28, 2011 10:13 am    Post subject: Reply with quote  Mark this post and the followings unread

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



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PostPosted: Sat May 28, 2011 2:55 pm    Post subject: Reply with quote  Mark this post and the followings unread

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



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PostPosted: Sun May 29, 2011 3:41 am    Post subject: Reply with quote  Mark this post and the followings unread

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.

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droffset



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PostPosted: Sun May 29, 2011 2:54 pm    Post subject: Reply with quote  Mark this post and the followings unread

Niiice, this info is gold, thanks folks.
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Psyingo



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PostPosted: Sun May 29, 2011 3:07 pm    Post subject: Reply with quote  Mark this post and the followings unread

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



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PostPosted: Mon May 30, 2011 9:30 am    Post subject: Reply with quote  Mark this post and the followings unread

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.

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Gordon Charlton



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PostPosted: Mon May 30, 2011 10:20 am    Post subject: Reply with quote  Mark this post and the followings unread

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.

Very Happy

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Cynosure
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PostPosted: Tue May 31, 2011 6:47 pm    Post subject: Reply with quote  Mark this post and the followings unread

This is all great info. I got lots to work with now. Thanks!
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JovianPyx



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PostPosted: Wed Jun 01, 2011 10:42 am    Post subject: Reply with quote  Mark this post and the followings unread

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.

Very Happy


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.

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