[sdiy] SSI2130

[James Coplin]

Yup. Id buy those with the wider format.

James

On Sep 19, 2020, 2:45 PM, at 2:45 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.
>
>
>Screen Shot 2020-09-19 at Sep 19 12.05.02PM.png       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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