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

[Bob Weigel]

Not sure which pot you mean fore sure.  LFO Speed?  The value if so is 
called "RD1M"  A reverse special taper I'd guess.

I've never seen that I'm aware of...an RD in a pot taper designation.  
Other pots have normal things by them like "A1M" for the glissando or 
"C500K" for the reverse tapered pwm speed. So that's my guess anyway.

  I'm not sure where to get that chip.  Doing a search there are no 
clues. Yamaha may still have some of them or know who might. -Bob

Antonio Tuzzi wrote:

>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
>>
>>    
>>
>_______________________________________________
>Synth-diy mailing list
>Synth-diy at dropmix.xs4all.nl
>http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>
>
>  
>