[sdiy] Question for Yamaha tech?

[Bob Weigel]

Man good to see they are getting some of my stuff linked..now if they'll 
just put my freakin' KEYWORDS in there SOMEWHERE! :-)  But anyway I 
think the 150 is the LFO chip if I remember right.  (going to cs-20M 
page...yup it's the lfo allright. ) The nts place or whatever they are 
had only a couple left and I bought a spare.  So hopefully they still 
have one. -Bob

Senso wrote:

> Hi guys,
>
> Tried this one at AH, but no smile so far. Maybe I have more luck here.
>
> Does anybody know what kind of IC this is:
> M51620P (8-dip)
>
> It also says YIG8531 which, on the one hand, looks like a date code, 
> but also has the letter markings that suggest it to be one of the 
> Yamaha IG chips.
>
> Of Google was my first try, which gave absolutely zero returns except 
> one. The most surprising part was that there wasn't even a single 
> question from anyone about it, something you will *always* encounter 
> when a chip is rare.
>
> The one entry was from sounddoctorin (yes, you Bob), but it gave no 
> info except the entry M51620P/IG00150, suggesting it was the same as 
> this Yamaha lfo.
>
> Anyone?
>
> Thanks,
> Senso
>
> PS: With all the information on the web about synthesizer parts, how 
> come there is virtually nothing about Yamaha's integrated circuits?
> I'd like to know more about the rest of the M516xx series as well...
>