[sdiy] Yamaha CS-15D schematic

[Bob Weigel]

The CS15D has the odd chips mentioned in the template page from 
sounddoctorin.com/synthtec as I try to do with all of them.  If anyone 
has info to add let me know. The CS series all use the same chips to a 
great extent, though some with Ring mods obviously use some additional 
chips etc.  But the IG00156 vcf chip and IG00151 VCA and IG00153 VCO and 
a few waveshaper options I think are common to all of them.

And to answer Richard also, yes I definitely have the 15D digram and the 
15.  The preset arrays are in there.  This is a synth with two synth 
channels with of the VCO chips, 2 EG's IG00159, one VCF chip and I think 
6 VCA chips per.  Whatever sounds it makes is the result of arranging 
these facilities with programming 'packs' of resistors and diodes it 
appears. Believe it or not :-).  It is a very innovative machine.  Gotta 
love it.   The machine uses 4558 op amps for the waveshape converter, 
not the ..IG00158 i think it is that the CS80 etc. uses. -Bob

anthony wrote:

> The important question for me is: is it worth having the schematic if 
> you don't have the actual synth? I mean are there good bits to try to 
> mess about with or is it disappointingly full of CEM parts like the 
> Roland SH-101?
>
>
>> That machine is truly one of my great all time ebay deals.  Folks 
>> picked it up in cali for me for 200 with an a perfect anvil flight 
>> case in perfect condition save the keys seem to need a little lube.  
>> They just seem a little sluggish compared to my CS20M with the same 
>> movement. Anyway I have the diagram from Yamaha's site but as a 
>> service guy of course I'm not supposed to share them.  As you see on 
>> my website the CS-15 and a lot of others are on the fdisk site.  I'm 
>> not sure how they/if they got permission or if Yamaha resents this at 
>> all.  Anybody up on Yamaha's attitude on this stuff? -Bob
>>
>> Richard Atkinson wrote:
>>
>>> Has anyone seen the schematic diagram for this rather unusual preset /
>>> variable monosynth? In one sense it's a more capable synthesizer 
>>> than any
>>> of the CS-5, 10, 15 bunch, even the CS-30, since it has two VCOs, 
>>> two VCFs,
>>> 2 VCAs and 4 envelope generators. However, half of that is stuck behind
>>> preset sounds only, and the modulation capabilities are inferior to 
>>> all the
>>> previous synthesizers.
>>>
>>> A prime candidate for modification and modularising, you might say!
>>>
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