[sdiy] SSI2130

[Benjamin Tremblay]

OMG now I know I’m really old. 
That’s amazing and I would not dare to try to assemble that. 

Benjamin Tremblay

> On Sep 19, 2020, at 5:11 PM, James Coplin <james at ticalun.net> wrote:
> 
> 
> Yup. Id buy those with the wider format.
> 
> James
>> On Sep 19, 2020, 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. 
>>> 
>>>         
>>> 
>>> 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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>> 
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