[sdiy] Analog Pitch Shifter and Octaver

[houshu at dsp.cl.nec.co.jp]

Hello Donald,

Thank you for your correction on the schematics.

Unfortunately, there is no pcb layout in the article.  The schematic
is an example to show how harmonizer works.  I think you are right.
The two outputs should not be mixed directly.  

I'll fix it up in a couple of weeks.

> Date:    Mon, 04 Jun 2001 20:51:14 JST
> From:    Donald Johnson <donaldj at infomatch.com>
>   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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 Osamu HOSHUYAMA                    NEC Corporation  Kawasaki JAPAN
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