[sdiy] LM394 vs MAT-02

[jays at aracnet.com]

You probably aren't going to be able to make boards for these at home and you'd better be a damn good solderer. These are in 363 packages which are very small (0.026" lead spacing, 0.012 lead width). I've made some adapter boards for them but haven't tried them out yet. Thought they would be some thing to make a discrete VCA with.

Jay S.

Scott Stites wrote:

> Just curious - I see that on the stompbox forum, RG Keen made reference to the DMMT3904 and DMMT3906, matched 3904's and 3906's in six pin SOT packages.  They sell at Mouser for $0.50 each.  Spec sheet says matching to 2% for the 3904 and 2% with 1% available for the 3906 by contacting the manufacturer.  Is this kind of matching anywhere in the range required of VCO expo converters? 
> 
> -----Original Message-----
> From: mark verbos <mverbos at earthlink.net>
> Sent: Nov 17, 2005 2:33 PM
> To: Peter Grenader <peter at buzzclick-music.com>
> Cc: synth-diy at dropmix.xs4all.nl
> Subject: Re: [sdiy] LM394 vs MAT-02
> 
> what are their minimum order requirements?
> 
> 
> mark
> 
> 
> 
> 
> Peter Grenader wrote:
> > I was originally using the LS312 (it's slightly more tightly matched -
> > spec'd at .2mV, but the units I got were much better than that).
> > 
> > I found the LS site while I was looking for ua726's once.  Didn't think
> > anything of them, bookmarked the site, blah --  but didn't try them until a
> > few months later as the LS312 was recommended by a tech named Julie
> > Yarlborough as a replacement for the AD811 when I was putting together a the
> > parts to build a Buchla 259 kit for Guido (which I was VERY fortunate to
> > squeak out of). 
> > 
> > The 312's were great, but it was Linear System's Don Howland (GREAT guy) who
> > then recommended  the higher gain 318 as he felt it was better suited for
> > VCO stability due to having half the sheet resistively of the 312 (basically
> > it turns on easier) which would make for better tracking across the audio
> > range.
> > 
> > Did it make a difference?  Honestly...I'm not  sure as any gains were
> > deluded by a major error found about that time in my expo converter -- I was
> > starving it's current which had my tracking at 2.7 octaves max.  Three
> > resistor value changes later, I was up to 7 octaves. In any event, I
> > continue to use 318 for a plethora of reasons, mostly due to a "if it works
> > don't screw with it" mentality but above that the guys at Linear Systems are
> > really terrific.  They're a low volume foundry themselves and therefore
> > really support the small guys.
> > 
> > Now, until recently when the VCO backlog was finally blown out, i WAS using
> > MAT's on my own VCOs - not because I felt they were better, because I got
> > them as samples and I was saving the LS devices for customer's units.  When
> > I finally switched them I did notice a sonic difference between the two,
> > particularly with expo FM.  The LS sounded a lot smoother than the MAT.
> > 
> > I apologize for the (for me, typically) non technical response here.  I'm a
> > hack as you know and in lea of technical chops I use my ears more than
> > anything else in component selection.
> > 
> > hope this helps -
> > 
> > - P
> > 
> > 
> 
> 
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