[sdiy] MN3207 and MN3102 Reissues

[Scott Stites]

No kidding!  It sure souped up that Matrix 1000, didn't it!

Cheers,
Scott


----- Original Message ----- 
From: "Gavin Muir" <gmuir at sympatico.ca>
To: "Scott Stites" <scottnoanh at peoplepc.com>
Cc: <mirwin at qouest.net>; <synth-diy at dropmix.xs4all.nl>
Sent: Saturday, October 30, 2004 1:52 PM
Subject: Re: [sdiy] MN3207 and MN3102 Reissues


> Actually, this is why I was interested to see some discussion of the 
> unit here. I never saw this so much as a "guitar" pedal, as it seems to 
> be the ideal way to add depth to digital synths, and spaciousness to 
> analogs.
> 
> Hey, if it can do THAT to the ol' DX tubular bells!! ;-)
> 
> I would LOVE to put together a couple of souped up "C" boards for my 
> DIY synths (not to mention that I would love to introduce my Obie to it 
> as well!!) ;-)
> 
> Gav
> 
> I
> On 30-Oct-04, at 4:58 PM, Scott Stites wrote:
> 
> > I listened to the samples of this chorus device at Modzero.  Holy 
> > moly, that
> > *is* a great sounding chorus!  Checking out the switchboard on the
> > schematic, I don't think I quite understand it yet.
> >
> > Cheers,
> > Scott
> >
> >
> > ----- Original Message -----
> > From: <mirwin at qouest.net>
> > To: "Gavin Muir" <gmuir at sympatico.ca>
> > Cc: <synth-diy at dropmix.xs4all.nl>
> > Sent: Saturday, October 30, 2004 8:56 AM
> > Subject: Re: [sdiy] MN3207 and MN3102 Reissues
> >
> >
> >> Gavin,
> >> The guitar lists are really the most suitable place to discuss the
> >> cloning of vintage guitar fx units - half the discussion revolves 
> >> around
> >>  cloning, subs, copyright issues etc.
> >>
> >> Regarding substitutions, most of the original Japanese parts are still
> >> available, including the different transistors, the MN3207 (and the
> >> companion MN3102 driver) are about as mainstream as it gets with 
> >> BBD's,
> >> relatively easy to find compared with ther BBDs, the NE570/571 
> >> compander
> >> is also a mainstream part. Parts warehouses that cater to the consumer
> >> electronics repair industry usually have these (check Main Electronic
> >> Supply in  Vancouver or www.bdent.com). The single supply op amp used 
> >> in
> >> the clock circuit (IIRC a BA718) may be hard to find, I tried several
> >> single-supply op amps with better specs (including TLC272) but 
> >> achieved
> >> the best results with a lowly LM358.
> >>
> >> The neat thing about the Dimension choruses is that they try to 
> >> achieve
> >> a "vibrato-free" chorusing through "static" pitch detuning by means of
> >> two parallel delay lines modulated by complementary LFO triangles.
> >> Listened to individually, each delay line output has it's pitch 
> >> shifted
> >> alternately up and down (sounds like a VCO being slightly 
> >> freq-modulated
> >> by a slow square wave). When the two delay outputs are combined, the
> >> result sounds like two static pitches, slightly detuned, with a slow
> >> beating taking place. A wonderful effect. Roland patented this 
> >> technique
> >> in the early 80's. The "D" has a better clock circuit than the "C", as
> >> well as more elaborate cross-mixing and filtering, plus the line 
> >> drivers
> >> and bar graph, etc.
> >> Regards, Mike
> >
>