[sdiy] Roland JP-4 VCO

[Bob Weigel]

Aaron, the sounddoctorin.com page is more concise than google in general 
for looking for schematics at least.  At least I try to keep it that 
way. In terms of schematics, the google 'turnover' rate isn't real 
high.  If anything is obsolete on my site always let me know so that I 
can keep it updated, but 
http://sounddoctorin.com/synthtec/roland/jp4.htm has the fdisk archive 
listed for a source for jp4.  HOPEFULLY EVERY resource availabe on 
google is concisely pointed to in an orderly fashion on that site.  Let 
me know if not. -Bob

Aaron Lanterman wrote:

>
> On Apr 14, 2008, at 6:09 PM, Mike I wrote:
>
>> Hi - the Roland JP-4 VCO is a bits + pieces charge-balancing circuit  
>> mostly
>> built with standard CMOS and transistors ( no RC4151 converter as in  
>> the
>> Chroma). JP-4 has a reputation for going out of tune easily though,  
>> maybe
>> out of tune but with nice linearity.
>
>
> I am curious about this - anyone know of JP-4 schematics on the web?  
> (Quick googling didn't uncover any)
>
> - Aaron
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