<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 src="cid:ii_kf9xuejj0" alt="Screen Shot 2020-09-19 at Sep 19 12.05.02PM.png" width="236" height="562"> <img src="cid:ii_kf9xuluk1" alt="Screen Shot 2020-09-19 at Sep 19 12.06.12PM.png" 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>
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