Reply 60 of 79, by radiance32
yyzkevin wrote on 2021-02-24, 23:13:
we can do almost anything on the sidecar because we have no physical constraints. If you want to make my life easy use components that have symbol,footprint and 3d model in SnapEDA.com , otherwise it is no big deal but I have to make the footprints/symbols myself. if the datasheet has example/reference design that is even better for me.
for our sidecar we will not utilize the speaker pin on the pcmcia standard, but I will still investigate and understand it better so the "card" version of the sound only aspect of this can use it, and having an external headphone jack/headphone can be optional
I'll make a list of what we need and links to the PDFs containing the components technical details here,
example/reference schematics (or an additional PDF which contains one)...
Here we go:
For the AD8397 opamp (the opamp to drive a set of headphones)
Here is the manufacturer's PDF with all the technical information (but no example/reference design/schematic in it...)
https://www.analog.com/media/en/technical-doc … eets/AD8397.pdf
However, here is a PDF containing the schematics of an evaluation board for op-amps like the AD8397, so you can use that as a reference design:
https://www.analog.com/media/en/technical-doc … ides/UG-128.pdf (you could use this for any similarly packaged dual-opamps)
And, another one with a reference schematic: https://www.analog.com/media/en/technical-doc … tes/AN-1429.pdf
SnapEDA page for the part:
https://www.snapeda.com/parts/AD8397/Analog%2 … search&t=AD8397
For the LM4889 "boomer" 1 watt mono speaker amplifier SMD IC that we'd need to drive the micro-speaker in the lxsidecar
Manufacturer's PDF containing several reference schematics:
https://www.ti.com/lit/ds/symlink/lm4889.pdf? … s=1614212141955
SnapEDA page for part:
https://www.snapeda.com/parts/LM4889MM/Texas% … search&t=LM4889
For the 1 watt micro-speaker to be mounted inside the LXsidecar case
SnapEDA page for part:
https://www.snapeda.com/parts/ABS-239-RC/Pro% … ch&t=ABS-239-RC
(seems to be lacking a 2d and 3d model, but it says to click a button and they will create one for you... never used this site before so not sure about how this works and if you have to pay for it or something,
but it doesn't matter anyways as we're not going to mount the speaker on the PCB, it will be mounted into the lxsidecar's case and connected via wires to the PCB which contains the LM4889 amplifier IC...
There we go, if I find any others I will update this page, however I'm going to move this to the github issue page instead, and just leave this post here,
but we should continue discussing this on the github issue page...