<div dir="ltr">Done....<div><br></div><div><div><img src="cid:ii_kfa5jfzp2" alt="Screen Shot 2020-09-19 at Sep 19 3.55.38PM.png" width="263" height="562"><br></div></div><div><br></div><div>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.</div><div><br></div><div>Pete</div><div><br></div><div><br></div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Sep 19, 2020 at 2:42 PM David G Dixon <<a href="mailto:dixon@mail.ubc.ca">dixon@mail.ubc.ca</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><u></u>
<div>
<div dir="ltr" align="left"><span><font color="#0000ff" size="2" face="Arial">DItto -- what Oren said. Make the pins 0.6" apart.
I'd buy that.</font></span></div><br>
<div dir="ltr" lang="en-us" align="left">
<hr>
<font size="2" face="Tahoma"><b>From:</b> Synth-diy
[mailto:<a href="mailto:synth-diy-bounces@synth-diy.org" target="_blank">synth-diy-bounces@synth-diy.org</a>] <b>On Behalf Of </b>Oren
Leavitt<br><b>Sent:</b> Saturday, September 19, 2020 11:24 AM<br><b>To:</b>
<a href="mailto:synth-diy@synth-diy.org" target="_blank">synth-diy@synth-diy.org</a><br><b>Subject:</b> Re: [sdiy]
SSI2130<br></font><br></div>
<div></div>
<p>Looks nice!</p>
<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>
<p>It's a VCOduino!</p>
<p>- Oren<br></p>
<div>On 9/19/20 12:40 PM, Pete Hartman wrote:<br></div>
<blockquote type="cite">
<div dir="ltr">
<div dir="ltr">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 ;).
<div><br></div>
<div>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.</div>
<div><br></div>
<div>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>
<div><img alt="Screen Shot 2020-09-19 at Sep 19 12.05.02PM.png" src="cid:174a825ef3fbeec81521" width="236" height="562">
<img alt="Screen Shot 2020-09-19 at Sep 19 12.06.12PM.png" src="cid:174a825ef3f1b171f502" width="249" height="562"></div>
<div><br></div>
<div>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.</div>
<div><br></div>
<div>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>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>It's half an inch between the rows of pins and .7"
wide by 1.7" long total.</div><br>Thoughts?<br><br>Thanks!</div>
<div><br>Pete</div></div></div><br>
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