[sdiy] analog pitch shifter circuit?

[s]

Hi Guys- I didn't catch this earlier, but it might be
of interest to those of you that have been discussing
the HT8950 "pitch shifter" chip and all...

http://www.generalguitargadgets.com/index.php?option=content&task=view&id=87&Itemid=115

it's a site that has _tons_ of effect designs on it-
the link I provided is for a pitch shifter pedal that
uses the chip everyone's been discussing. They also
have some BBD delay circuits. Actually, they have a
lot of delay/modulation/echo type of effects that use
BBDs.

It's really a useful page for effects & whatnot- they
sell pcbs for most of the designs, and they are really
responsive and helpful with questions. A lot of the
designs are original, but they also have a lot of
clones of really famous effect pedals. 

Either way, it's really easy to put the PCB behind a
synth frontpanel and adapt it to your power system.
I'm adapting a delay design myself for use in my
modular. It's no blacet time machine, but I can build
2 for half the price of a time machine. And being on a
limited budget, I'm happy with that until I can get
the time machine.

Hope that helps someone!
HAppy new year,
s



--- Scott Stites <scottnoanh at peoplepc.com> wrote:

> "The same thing can be done using analog Bucket
> Brigade Devices (Hi, Harry).
> You need to modulate the BBD clock with a sawtooth
> wave.  The upward-rising
> (or downward-going for lower pitches) sawtooth wave
> emulates the effect of
> the
> rotating tape head, effectively raising the pitch of
> the BBD output by a
> constant amount.  Well, constant until the sawtooth
> gets to its peak and has
> to
> retrace back to the bottom again...  "
> 
> 
> Yup, and I (and probably others on this list) have
> such a device, though
> it's now in a rather disassembled state (as probably
> the others owned by
> list members are).  Bought it from Radio Shack back
> in the late 80's (when
> you could get cool geeky stuff from the Shack). 
> It's a cassette recorder
> that had two slide pots on it.  One controlled the
> speed of the tape itself
> and the other controlled the pitch of the playback. 
> It was designed for
> recording class notes, etc, and upon playback you
> could slow down or speed
> up the recording while adjusting the pitch so that
> it didn't sound like a
> chipmunk.  Didn't sound like a chipmunk, but did
> make the recorded voice
> sound rather like gargling (though still a tad
> better than modern answering
> machines that have the same feature).  The fun part
> was you could adjust the
> pitch and playback speed for different pitch/cadence
> transposition effects.
> I also used to be able to press down the record/play
> buttons just so and
> have the monitor come out directly when I spoke into
> the microphone -
> sounded groovy low and gargly.  Last time I looked,
> I believe it had an
> MN3004 in it.....
> 
> Now if I could only find that old Rat Shack
> parabolic mirror cigarette
> lighter - now *that* was cool......
> 
> Cheerio,
> Scott
> 
> 



		
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