[arm-allstar] I think I found a new BF-888s board, need help finding COS

[Sean McCarthy]

See if it matches the boards I've been using here.

wx8l.blogspot.com

On Sat, Aug 11, 2018 at 2:07 PM "Andrew Hull KE8HEV via arm-allstar" <
arm-allstar at hamvoip.org> wrote:

> Outstanding, Doug. Thanks!
>
> I took the board off the sink, and easily found the chip. I couldn't find
> continuity from pin 1 to any points on the other side of the board, so I
> tied in right on the chip.
>
> Once the dab of silicone firms up it'll be time to reassemble.
>
> Thanks again!
>
> Andy
> --
> Andy Hull
> KE8HEV
>
> [Any errors in spelling, fact, or tact are transmission errors]
>
>
> On Sat, Aug 11, 2018 at 12:57 PM "Doug Crompton via arm-allstar" <
> arm-allstar at hamvoip.org> wrote:
>
> > Andy,
> >
> >   There have been many iterations of the 888 but in all cases they retain
> > the 8 pin chip where COS is picked up. I am attaching a photo from the
> > howtos at hamvoip.org showing the chip. There are two 8 pin chips and
> > part numbers are often hard to find. One of them is the spot - pin 1.
> > Placement of the chips changes so you will need to check which one it is.
> > The COS goes high on signal - 0V no signal, >2.5V signal.  If you cannot
> > find a connection on the circuit side you will have to remove the board
> to
> > get to the chip. Info on doing that is in the howto.
> >
> >
> > *73 Doug*
> >
> > *WA3DSP*
> >
> > *http://www.crompton.com/hamradio <http://www.crompton.com/hamradio>*
> >
> >
> > On Sat, Aug 11, 2018 at 12:38 PM, "Andrew Hull KE8HEV via arm-allstar" <
> > arm-allstar at hamvoip.org> wrote:
> >
> >> Hello All,
> >> I'm in the process of building a simplex node (RA-40 & BF-888s).
> >>
> >> The BF-888s that I received has a date stamp on the board of
> 2017-11-04. I
> >> believe that this is an updated revision from the board that Chris Hood
> >> documents here:
> >> http://www.chrishoodblog.com/allstar-node-with-bf-888s-short-board/
> >>
> >> The design looks similar enough that the RX Audio, PTT, and Mic Audio
> >> appear to be in the same places. However, I'm at a loss for COS.
> >>
> >> Has anyone already solved the mystery for this revision? My Google
> >> attempts
> >> have turned up nothing.
> >>
> >> If not, could anyone offer some advice on how to find it myself? I
> >> consider
> >> myself in the "knows enough to be dangerous" category of low level
> >> electronics. So, with a friendly shove in the right direction, I hope I
> >> can
> >> find it.
> >>
> >> Here's a photo of my board. I haven't taken it off the heatsink to get a
> >> look at the other side.
> >> https://photos.app.goo.gl/pcnRfK2X7Pt8HhXKA
> >>
> >> Thank you!!
> >>
> >> 73,
> >> Andy
> >>
> >> --
> >> Andy Hull
> >> KE8HEV
> >>
> >> [Any errors in spelling, fact, or tact are transmission errors]
> >> _______________________________________________
> >>
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> >>
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> >>
> >
> > _______________________________________________
> >
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> >
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