[sdiy] SSI2130

Pete Hartman pete.hartman at gmail.com
Sat Sep 19 22:57:33 CEST 2020


[image: Screen Shot 2020-09-19 at Sep 19 3.55.38PM.png]

And of course you don't have to use the square pin strips that this uses
for the default render, it would be feasible to use the fine pin headers
that are sized to insert into sockets.


On Sat, Sep 19, 2020 at 2:42 PM David G Dixon <dixon at mail.ubc.ca> wrote:

> DItto -- what Oren said.  Make the pins 0.6" apart.  I'd buy that.
> ------------------------------
> *From:* Synth-diy [mailto:synth-diy-bounces at synth-diy.org] *On Behalf Of *Oren
> Leavitt
> *Sent:* Saturday, September 19, 2020 11:24 AM
> *To:* synth-diy at synth-diy.org
> *Subject:* Re: [sdiy] SSI2130
> Looks nice!
> Why not just go with a 0.6 inch wide DIP format? It'll fit a standard 0.6
> wide DIP socket and you'll have a little more wiggle room.
> It's a VCOduino!
> - Oren
> On 9/19/20 12:40 PM, Pete Hartman wrote:
> I was inspired last night to take a crack at the idea of a breakout that
> could have the chip pre-soldered.  I don't normally do a lot of work with
> finer pitch SMD so I found I had to use fairly fine traces to route to the
> pins with the chip rotated (which seemed to make the most sense, since
> going to a DIP form factor).  Necking in KiCad is not something I've
> mastered and I didn't spend a lot of time when I found it wasn't working
> the way I thought the descriptions online said it should.  PS: not looking
> for a debate about CAD packages ;).
> I'm curious if any of the more experienced would have any opinions they'd
> care to offer?  Full disclosure: the intent is for this to be sold as a DIY
> tool, so if providing advice for what might become a low volume commercial
> product is a concern, by all means, don't feel like you are obligated to
> comment.
> First the images.  I'm also sending pictures to the list for the first
> time, so if for some reason this doesn't work, I can always throw links to
> my google drive up pretty quickly.
> [image: Screen Shot 2020-09-19 at Sep 19 12.05.02PM.png]       [image:
> Screen Shot 2020-09-19 at Sep 19 12.06.12PM.png]
> I liked the idea of having the regulator(s) on board, so I dug around to
> find a couple that seemed likely.  I did find that -V regulators were
> significantly more expensive (Q100 of both of these are under $0.30,  Q10,
> and I didn't look for Q100, of even a pretty basic - regulator was on the
> order of $3.00).  Since the chips tolerates up to -18V I decided to forego
> a regulator on the negative rail.
> The V+ equivalent pin feeds the TLV1117-50, and that 5V feeds the
> MCP1700-25 as well as the actual V+ pin on the chip.  I figured someone
> might want to use their own different 2.5V reference so I put a normally
> closed set of jumper pads that could be cut if preferred (like the USB
> power on a teensy, for example).  This also allows you to take the 2.5V
> reference *off* the pin if you wanted to use it for expo scaling, or
> through zero, etc.  Sitting here this morning I am thinking it might be a
> good idea to provide an extra pin at the top edge so the 5V reference could
> be treated similarly.  I don't think I could do exactly the same thing
> because there has to be some way for the higher voltage to get onto the
> breakout.
> All the caps are 0603, which is about as small as I'd want to hand solder;
> although I do not intend to hand solder it myself, I figured leaving the
> option open even if just for prototyping seemed like a good idea.  Same
> idea behind using "handsolder" footprints for the regulator & reference.
> It's half an inch between the rows of pins and .7" wide by 1.7" long total.
> Thoughts?
> Thanks!
> Pete
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