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

[Joe Puma]

Mike thats a well compact node you created there, I thought I mine was pretty compact. Good job on the construction.

Joe
KD2NFC



> On Aug 11, 2018, at 5:51 PM, Mike Besemer via arm-allstar <arm-allstar at hamvoip.org> wrote:
> 
> Careful with the silicon.  If it smells like vinegar it's acidic and should
> not be used around electronics... or any metal you don't want corroded.  
> 
> Mike
> WM4B
> 
> -----Original Message-----
> From: arm-allstar [mailto:arm-allstar-bounces at hamvoip.org <mailto:arm-allstar-bounces at hamvoip.org>] On Behalf Of
> "Andrew Hull KE8HEV via arm-allstar"
> Sent: Saturday, August 11, 2018 2:00 PM
> To: arm-allstar at hamvoip.org <mailto:arm-allstar at hamvoip.org>
> Cc: Andrew Hull KE8HEV
> Subject: Re: [arm-allstar] I think I found a new BF-888s board, need help
> finding COS
> 
> 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 <mailto: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> <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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