[sdiy] Analog Pitch Shifter and Octaver

[Donald Johnson]

At 12:23 PM 04/06/01 +0900, houshu at dsp.cl.nec.co.jp wrote:
>Hello List,
>
>I added schematics of analog harmonizer (pitch shifter) using BBDs,
>and octaver.  Both are from Japanese magazines.
>
>http://www5b.biglobe.ne.jp/~houshu/synth/index.html
>
>Please see "Effector" part at the bottom of the page.
>
>Enjoy,

  Hi,
  I had a look at the harmonizer schematic, and it looks like there's
  an error in it.

  The X1 input to the 4053 switch (that selects the a and b outputs
  of the BBDs [upper right]) is unconnected. Both the a and b outputs
  are joined together at the 470K resistor.

  I think that the b output should feed into the X1 input, and not be
  joined with the a output.

  I've attached two small files: original and revised (jpegs).

  Could you check the rest of the article? Maybe the circuit board
  will show the correct connections.

  Anyway, thanks for placing the information on your website.
  don.
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( (        don johnson        ) )
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