[sdiy] Re: yamaha CS01 with missing LFO: a problem to solve

Antonio Tuzzi antoniotuzzi at gmail.com
Tue Sep 4 10:07:54 CEST 2007


oops

maybe the pot is 1m log....

(cannot read on the schematics:
www.matrixsynth.com/blog/media/yamaha/cs01sch/
)


On 9/4/07, Antonio Tuzzi <antoniotuzzi at gmail.com> wrote:
> Hello Friends,
>
> I have this cs01 and is missing the LFO signal, I think is a case of
> bad YM10150 (the main yamaha IC in the keyboard).
>
> what I have available on the board is
>
> 10 k lin slider
> +
> 22k resistor
> +
> 0.033 uf cap
>
> the lfo range was
> 0.3 to 22 hz
>
> the power available is  -9v to 0v
>
> question:
> can I add just an opamp with these elements to get back an LFO in the
> same range?
>
> (maybe adding just a couple of passive components...)
>
>
> thank you
>
> at
>



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