[sdiy] help finding roland filter schematics?

Wed Apr 29 20:39:14 CEST 2009

VCF chips (Roland, Korg, CEM, SSM, etc.) are generally based on OTAs (though the way the capacitors are connected on the SSM 2044 suggests that it may be some sort of ladder filter).  Of course there are differences in the transconductance stages and buffer stages, etc. that will affect the sound, but the basic idea is the same.  You can think of the Roland IR3109 as being basically the same as the SSM 2040, and you could build the same thing with two 13700s and an exponential amplifier.  It won't necessarily sound identical, but it's at least the same topology.

http://www.analoguerenaissance.com/D80017/  I believe this is just made
with standard OTAs and op-amps (13700 and TL074) and it's supposedly
indistinguishable from the original part (though I'm sure it took a lot of careful adjustment to get it to that point).

----------------------------------------
> From: subjectivity at hotmail.com
> To: gsn10 at hotmail.com
> CC: synth-diy at dropmix.xs4all.nl
> Subject: RE: [sdiy] help finding roland filter schematics?
> Date: Wed, 29 Apr 2009 17:30:48 +0000
>
>
> what about the later JX series and alpha juno's?
>
>
>
> were these still basically just OTA filters?
>
>
> i would love to see the jx8p/jx10 schematic. of course that is just my frame of reference as i have never Owned a jupiter.
>
> let me ask this....do all the of the comparable years sound similar? or was there a real difference between say a jupiter filter and a juno filter or a JX filter??
>
> this gets very interesting for me because i had always thought the SPECIAL roland filter chips were SPECIAL. but if all they are are basically OTA's then this opens up a whole world of things to learn from!
>
> now i just have to find those schematics!!
>
> thanks
>
>
>
>
>
>
>
>
>
>
>
> --------------------------------------------
> check out various dan music at:
>
> http://www.myspace.com/lossnyc
>
> (updated monthly)
>
> http://www.soundclick.com/lossnyc.htm
>
>
>
> http://www.indie911.com/dan-snazelle
>
> (or for techno) http://www.myspace.com/snazelle
>
> ALSO check out Dan synth/Fx projects:
>
> AUDIO ARK:
>
> www.youtube.com/watch?v=TJRpvaOcUic
>
> www.youtube.com/watch?v=BqIa_lXQNTA&feature=channel_page
>
> www.youtube.com/watch?v=V4nJPjGgOcU&feature=channel_page
>
> and soundtrack/design work:
>
> NEW: check out Dan's sound design from the 1998 award winning film SAFARI by catherine chalmers
>
> http://www.catherinechalmers.com/videos.cfm
>
>
>
>
>
>
> ----------------------------------------
>> From: gsn10 at hotmail.com
>> CC: synth-diy at dropmix.xs4all.nl
>> Subject: RE: [sdiy] help finding roland filter schematics?
>> Date: Wed, 29 Apr 2009 13:04:30 -0400
>>
>>
>> The SH-1000, SH-2000, SH-3 (not SH-3a), SH-5, System 100 (not 100M) and TB-303 all used diode or transistor ladder filters. All others, as far as I know, used OTA designs, though there were plenty of variations (using 3080, BA662, custom chips that included buffers and a resonance OTA, in both 4 pole and state variable topologies).
>>
>> ----------------------------------------
>>> From: subjectivity at hotmail.com
>>> To: fanwander at mnet-online.de
>>> Subject: RE: [sdiy] help finding roland filter schematics?
>>> Date: Wed, 29 Apr 2009 15:08:34 +0000
>>> CC: synth-diy at dropmix.xs4all.nl
>>>
>>>
>>>
>>> after more searching (and printing out the SH7, i realized it looks great!) i really only still need the SH1 filter values.
>>>
>>>
>>> btw...are there any other missing roland series that use OTA filters? i know the DELTA does...any others?
>>> thanks so much for your help and wonderful site!!
>>>
>>>
>>>
>>>
>>>
>>> --------------------------------------------
>>> check out various dan music at:
>>>
>>> http://www.myspace.com/lossnyc
>>>
>>> (updated monthly)
>>>
>>> http://www.soundclick.com/lossnyc.htm
>>>
>>>
>>>
>>> http://www.indie911.com/dan-snazelle
>>>
>>> (or for techno) http://www.myspace.com/snazelle
>>>
>>> ALSO check out Dan synth/Fx projects:
>>>
>>> AUDIO ARK:
>>>
>>> www.youtube.com/watch?v=TJRpvaOcUic
>>>
>>> www.youtube.com/watch?v=BqIa_lXQNTA&feature=channel_page
>>>
>>> www.youtube.com/watch?v=V4nJPjGgOcU&feature=channel_page
>>>
>>> and soundtrack/design work:
>>>
>>> NEW: check out Dan's sound design from the 1998 award winning film SAFARI by catherine chalmers
>>>
>>> http://www.catherinechalmers.com/videos.cfm
>>>
>>>
>>>
>>>
>>>
>>>
>>> ----------------------------------------
>>>> Date: Wed, 29 Apr 2009 16:51:52 +0200
>>>> From: fanwander at mnet-online.de
>>>> To: subjectivity at hotmail.com
>>>> CC: synth-diy at dropmix.xs4all.nl
>>>> Subject: Re: [sdiy] help finding roland filter schematics?
>>>>
>>>> Hi Dan
>>>>
>>>> the schematics are linked in that file ;-)
>>>>
>>>> http://fa.utfs.org/diy/roland_filters/SH1.jpg
>>>> http://fa.utfs.org/diy/roland_filters/SH2.jpg
>>>> http://fa.utfs.org/diy/roland_filters/SH5.jpg
>>>> http://fa.utfs.org/diy/roland_filters/SH7.jpg
>>>> http://fa.utfs.org/diy/roland_filters/SH09.jpg
>>>>
>>>> These cutouts are mostly from scans which Mark Glinsky is selling. They
>>>> were intended for informational use only. I could do some littlebit
>>>> large cutouts, but if you want the full schemoe, then please buy it from
>>>> Mark. He does a great job on that and I don't want to spoil his business.
>>>>
>>>> Also there is http://spash.free.fr/download/synthmanuals/ from Greg
>>>> Baumont with a lot of service manuals.
>>>>
>>>> Florian
>>>>
>>>>
>>>> Dan Snazelle schrieb:
>>>>>
>>>>> hey there
>>>>>
>>>>> in my quest to better understand OTA filters, i have been trying to find some of the old roland OTA filter schematics
>>>>> in readable scans.
>>>>>
>>>>> i found this CHART which lists which of the roland filters use regular OTA's.
>>>>>
>>>>> http://fa.utfs.org/diy/roland_filters/index.html
>>>>>
>>>>>
>>>>> so i am looking for readable SCHEMATICS of the SH1, SH2, SH7, and maybe sh09
>>>>>
>>>>> also...these are probrably good ones to look at in general for vco and lfo ideas,etc.
>>>>>
>>>>> a few questions...does anyone know how much a BA662 compares to a ca3080?
>>>>>
>>>>> also...in the later ROLAND OTA CHIPS are these basically just 4 otas on a chip? or is there something fancier going on? are these available as schematics anywhere?
>>>>>
>>>>> Thanks SO MUCH!!
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> --------------------------------------------
>>>>> check out various dan music at:
>>>>>
>>>>> http://www.myspace.com/lossnyc
>>>>>
>>>>> (updated monthly)
>>>>>
>>>>> http://www.soundclick.com/lossnyc.htm
>>>>>
>>>>>
>>>>>
>>>>> http://www.indie911.com/dan-snazelle
>>>>>
>>>>> (or for techno) http://www.myspace.com/snazelle
>>>>>
>>>>> ALSO check out Dan synth/Fx projects:
>>>>>
>>>>> AUDIO ARK:
>>>>>
>>>>> www.youtube.com/watch?v=TJRpvaOcUic
>>>>>
>>>>> www.youtube.com/watch?v=BqIa_lXQNTA&feature=channel_page
>>>>>
>>>>> www.youtube.com/watch?v=V4nJPjGgOcU&feature=channel_page
>>>>>
>>>>> and soundtrack/design work:
>>>>>
>>>>> NEW: check out Dan's sound design from the 1998 award winning film SAFARI by catherine chalmers
>>>>>
>>>>> http://www.catherinechalmers.com/videos.cfm
>>>>>
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> Synth-diy mailing list
>>>>> Synth-diy at dropmix.xs4all.nl
>>>>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>>>>>
>>>>
>>>
>>> _______________________________________________
>>> Synth-diy mailing list
>>> Synth-diy at dropmix.xs4all.nl
>>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>>
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