Author Topic: clean octave up and down  (Read 2547 times)

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clean octave up and down
« on: July 24, 2007, 08:02:15 AM »
is there any schem for a clean octave up/down?
i don't want fuzz just the octave effect
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Mark Hammer

Re: clean octave up and down
« Reply #1 on: July 24, 2007, 10:11:37 AM »
Legitimate question, but BOY has it been asked often!

Two responses:

1) Search the forum for previous threads.

2) General consensus is that neither are easily realizable in the analog domain.  You'll always get some audible distortion simply because of how octaves are obtained.  It's just a question lof how much and how willing you are to sacrifice clarity for the goal of having something that doesn't sound distorted.  Finally, up and down use different processes.

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Re: clean octave up and down
« Reply #2 on: July 24, 2007, 10:40:04 AM »
thanks for the reply Mark

I did search the forum but couldn't find a schemo for a pedal that does both

I have no problem if it is analog or digital as long as i can easily get the parts

any recommandetions?
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SonicVI

Re: clean octave up and down
« Reply #3 on: July 24, 2007, 10:43:53 AM »
Search around for the Pearl Octave pedal, it does one and two octaves down and one octave up.  I know I've seen the schematic on the web somewhere.

Mark Hammer

Re: clean octave up and down
« Reply #4 on: July 24, 2007, 10:46:23 AM »
...And there is the Super-Octaver project posted on my site (http://hammer.ampage.org).

Just keep in mind that there is a world of difference between a digital harmonizer that upshifts or downshifts the *entire* signal, regardless of how many notes are involved, and an analog octaver that will only handle one note ata time in down mode (and consequently tends to force mono properties on the up mode as well if they are to be used concurrently),

R.G.

Re: clean octave up and down
« Reply #5 on: July 24, 2007, 10:56:03 AM »
All analog octaves up/down cause some notable degree of distortion.

Clean octaves require not just digital, but DSP. There is a digital and dsp forum but there have been no octave shifting designs there. I don't know of any DIY digital octave up/down.

The cleanest of the octaves up is the MOS Doubler at GEO. But that doesn't help with your octave down, and it's a single-note-at-a-time effect, like all analog octaves.
R.G.

In response to the questions in the forum - PCB Layout for Musical Effects is available from The Book Patch. Search "PCB Layout" and it ought to appear.

magikker

Re: clean octave up and down
« Reply #6 on: July 24, 2007, 12:17:25 PM »
Hey R.G. The link at the top of your page http://www.geofex.com/schemata.htm to the Mos Doubler is dead (the one under new effects) .... the link futher down the page works though.

R.G.

Re: clean octave up and down
« Reply #7 on: July 24, 2007, 01:47:23 PM »
Thanks. I'll go clean that up in my next sweep of the page.
R.G.

In response to the questions in the forum - PCB Layout for Musical Effects is available from The Book Patch. Search "PCB Layout" and it ought to appear.

zeta55

Re: clean octave up and down
« Reply #8 on: July 24, 2007, 01:49:54 PM »
...And there is the Super-Octaver project posted on my site (http://hammer.ampage.org).

Just keep in mind that there is a world of difference between a digital harmonizer that upshifts or downshifts the *entire* signal, regardless of how many notes are involved, and an analog octaver that will only handle one note ata time in down mode (and consequently tends to force mono properties on the up mode as well if they are to be used concurrently),

I did try that Super Octaver. It did produce somewhat clean up and down octaves as I remember. However it was some time ago and I was never pleased with the circuit. After many mods and tryouts it ended up in my "box of never completed circuits"

/Krister

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Re: clean octave up and down
« Reply #9 on: July 25, 2007, 05:15:57 AM »
couldn't find the pearl schematic but the super-octaver looks good.
i think i'll give it a try
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lowstar

Re: clean octave up and down
« Reply #10 on: July 25, 2007, 06:46:03 AM »
hank reynolds 3rd who is a forum member here has done a unverified layout for the pearl octaver.

http://www.diystompboxes.com/smfforum/index.php?topic=52169.0

was not so hard to find, 20 sec using the search function.

and the schemo at discofreq┤s site:

http://filters.muziq.be/files/schematics/pearl_oc-07.jpg

took 5 minutes to search for.

cheers,
lowstar
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