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<DIV dir=ltr align=left><SPAN class=999520705-20092020><FONT color=#0000ff
size=2 face=Arial>It would be great if it were something that could be plugged
into a +/-12V or +/-15V system without fuss.</FONT></SPAN></DIV><BR>
<DIV dir=ltr lang=en-us class=OutlookMessageHeader align=left>
<HR tabIndex=-1>
<FONT size=2 face=Tahoma><B>From:</B> Synth-diy
[mailto:synth-diy-bounces@synth-diy.org] <B>On Behalf Of
</B>ColinMuirDorward<BR><B>Sent:</B> Saturday, September 19, 2020 4:26
PM<BR><B>To:</B> Pete Hartman<BR><B>Cc:</B> synth-diy@synth-diy.org
DIY<BR><B>Subject:</B> Re: [sdiy] SSI2130<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV dir=auto>FYI I asked at SSI, and Dan Parks said they are working on some
kind of breakout adapter, but they are still six weeks out. I'm not sure what
they are planning. Could be something like Pete's design, or maybe a "passive"
adapter?
<DIV dir=auto><BR></DIV>
<DIV dir=auto>C</DIV>
<DIV dir=auto><BR></DIV></DIV><BR>
<DIV class=gmail_quote>
<DIV dir=ltr class=gmail_attr>On Sat, Sep 19, 2020, 4:20 PM Pete Hartman, <<A
href="mailto:pete.hartman@gmail.com">pete.hartman@gmail.com</A>>
wrote:<BR></DIV>
<BLOCKQUOTE
style="BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex; PADDING-LEFT: 1ex"
class=gmail_quote>
<DIV><BR></DIV>
<DIV>
<DIV dir=auto>Me either. That's why I want something a fab house can
assemble. :). I can solder the legs in all day long....</DIV><BR>
<DIV class=gmail_quote>
<DIV dir=ltr class=gmail_attr>On Sat, Sep 19, 2020 at 6:12 PM Benjamin
Tremblay via Synth-diy <<A href="mailto:synth-diy@synth-diy.org"
rel=noreferrer target=_blank>synth-diy@synth-diy.org</A>> wrote:<BR></DIV>
<BLOCKQUOTE
style="BORDER-LEFT: rgb(204,204,204) 1px solid; MARGIN: 0px 0px 0px 0.8ex; PADDING-LEFT: 1ex"
class=gmail_quote>
<DIV dir=auto>OMG now I know I’m really old.
<DIV>That’s amazing and I would not dare to try to assemble
that. <BR><BR>
<DIV dir=ltr>Benjamin Tremblay</DIV>
<DIV dir=ltr><BR>
<BLOCKQUOTE type="cite">On Sep 19, 2020, at 5:11 PM, James Coplin <<A
href="mailto:james@ticalun.net" rel=noreferrer
target=_blank>james@ticalun.net</A>> wrote:<BR><BR></BLOCKQUOTE></DIV>
<BLOCKQUOTE type="cite">
<DIV dir=ltr></DIV></BLOCKQUOTE></DIV></DIV>
<DIV dir=auto>
<DIV>
<BLOCKQUOTE type="cite">
<DIV dir=ltr>
<DIV dir=auto>Yup. Id buy those with the wider
format.<BR><BR></DIV><BR><BR>
<DIV dir=auto>James</DIV><BR><BR>
<DIV class=gmail_quote>On Sep 19, 2020, at 2:45 PM, David G Dixon <<A
href="mailto:dixon@mail.ubc.ca" rel=noreferrer
target=_blank>dixon@mail.ubc.ca</A>> wrote:
<BLOCKQUOTE
style="BORDER-LEFT: rgb(204,204,204) 1px solid; MARGIN: 0pt 0pt 0pt 0.8ex; PADDING-LEFT: 1ex"
class=gmail_quote><BR><BR>
<DIV dir=ltr align=left><BR><BR><SPAN><FONT
style="FONT-FAMILY: Arial; COLOR: rgb(0,0,255)" size=2 face=Arial>DItto
-- what Oren said. Make the pins 0.6" apart. I'd buy
that.</FONT></SPAN><BR><BR></DIV><BR><BR><BR><BR><BR>
<DIV dir=ltr lang=en-us align=left><BR><BR>
<HR>
<BR><BR><FONT style="FONT-FAMILY: Tahoma; COLOR: rgb(0,0,0)" size=2
face=Tahoma><B style="FONT-FAMILY: Tahoma">From:</B> Synth-diy
[mailto:<A style="FONT-FAMILY: Tahoma"
href="mailto:synth-diy-bounces@synth-diy.org" rel=noreferrer
target=_blank>synth-diy-bounces@synth-diy.org</A>] <B
style="FONT-FAMILY: Tahoma">On Behalf Of </B>Oren Leavitt<BR><B
style="FONT-FAMILY: Tahoma">Sent:</B> Saturday, September 19, 2020 11:24
AM<BR><B style="FONT-FAMILY: Tahoma">To:</B> <A
style="FONT-FAMILY: Tahoma" href="mailto:synth-diy@synth-diy.org"
rel=noreferrer target=_blank>synth-diy@synth-diy.org</A><BR><B
style="FONT-FAMILY: Tahoma">Subject:</B> Re: [sdiy]
SSI2130<BR></FONT><BR><BR><BR><BR><BR></DIV><BR><BR>
<DIV></DIV><BR><BR>
<P>Looks nice!</P><BR><BR>
<P>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.</P><BR><BR>
<P>It's a VCOduino!</P><BR><BR>
<P>- Oren<BR></P><BR><BR>
<DIV><BR><BR>On 9/19/20 12:40 PM, Pete Hartman
wrote:<BR><BR><BR><BR><BR></DIV><BR><BR>
<BLOCKQUOTE type="cite"><BR><BR>
<DIV dir=ltr><BR><BR>
<DIV dir=ltr><BR><BR>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 ;). <BR><BR>
<DIV><BR><BR><BR><BR><BR></DIV><BR><BR>
<DIV><BR><BR>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.<BR><BR></DIV><BR><BR>
<DIV><BR><BR><BR><BR><BR></DIV><BR><BR>
<DIV><BR><BR>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.<BR><BR><BR><BR><BR><BR><BR><BR>
<DIV><BR><BR><IMG
alt="Screen Shot 2020-09-19 at Sep 19 12.05.02PM.png" width=236
height=562> <BR><BR><IMG
alt="Screen Shot 2020-09-19 at Sep 19 12.06.12PM.png" width=249
height=562><BR><BR></DIV><BR><BR>
<DIV><BR><BR><BR><BR><BR></DIV><BR><BR>
<DIV><BR><BR>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.<BR><BR></DIV><BR><BR>
<DIV><BR><BR><BR><BR><BR></DIV><BR><BR>
<DIV><BR><BR>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.<BR><BR><BR><BR><BR><BR>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.<BR><BR><BR><BR><BR><BR>It's half an inch between the rows
of pins and .7" wide by 1.7" long
total.<BR><BR></DIV><BR><BR><BR>Thoughts?<BR><BR><BR><BR><BR><BR>Thanks!<BR><BR></DIV><BR><BR>
<DIV><BR><BR><BR>Pete<BR><BR></DIV><BR><BR></DIV><BR><BR></DIV><BR><BR><BR><BR><BR>
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