[sdiy] harmonic generator

[media.nai at rcn.com]

At 12:02 PM +0000 02/21/02, Scott Gravenhorst wrote:
>
>Also, you don't need one for *each* harmonic.  Eg, 1, 2, 3, 4, 6
>& 12 are easily done with one PLL, 5 & 10 with another, etc.
>There are many ways to approach this, but you can do it with less
>than 10.  I have a circuit at:

Yes, you can do it with less than ten, but you do need more than one PLL
because of dividers necessary before each PLL.

At 8:16 PM +0100 02/21/02, Magnus Danielson wrote:
>
>You could make a good tracking PLL if you want to, but one has to use
>higher degree PLLs to get a good result, which usually is out of scope
>for most people.

Perhaps its out of my scope as well!!  I have thought about using a
discrete PLL using flip-flops for a phase detector and a
voltage-to-frequency converter chip, but V/F chips are expensive, and the
resulting parts count would be enormous.  I'm not sure what you mean by
"higher degree".  Considering all the various PLL chips available, which
would you recommend??

>> Wouldn't full wave rectification simply result in octaves??
>
>Yes, but you fail to get other overtones than 2, 4, 8 and 16

I don't even see how you would get the 2nd, 4th, 8th, etc.  You would get
the octave, two octaves above, three octaves above, etc.  That's not the
same thing.  The 4th is 4/3 times the fundamental, not four times the
fundamental, or am I missing something??