[arm-allstar] DIY Open Board FOB Project

[Kent Ochs]

Doug,
Thank you for the instructions and photos.  The open board FOB certainly makes what was a somewhat difficult mod, easier.
It is not a matter of if, but when you will experience a USB interface lock up.  It would be nice if someone could take this DIY project just one step further by showing how to integrate a 555 timer to monitor the heartbeat led and disconnect the PTT line if a lock up does occur.

I certainly don't want to take any business away from the vendors who have already included this feature into their designs, but I'm guessing the people going the DIY route, probably would not be customers anyway.

Kent OchsW9KAO

Doug wrote:

Date: Fri, 7 Jul 2017 09:57:47 -0400From: Doug Crompton <wa3dsp at gmail.com>
To: ARM Allstar <arm-allstar at hamvoip.org>
Subject: [arm-allstar] FOB Photos
Message-ID:
    <CAMp6vsv85+Tn59DU=K1yWLcuBGf93AZ_OmiT55Jn+WD3PGN_cQ at mail.gmail.com>
Content-Type: text/plain; charset="UTF-8"

Attached are examples of how to package the open board FOB. This shows
using a DB25 wired to emulate a DMK/URI. The USB connections are wired
directly to the board from a cut USB cable. The board is mounted on a sub
board where all of the connections are made. The two wires to the CM108 in
the second photo are fed under the row of pins from the right and tacked at
the last pin on the left.

I encourage you to make this a DIY project but the FOB shown here is being
made and is available for purchase. I hesitated to make this public as it
is more a service than a business and I don't want the producer to become
inundated!


*73 Doug*

*WA3DSP*